A battery and a cover plate assembly thereof

Abstract

The utility model relates to new energy battery technical field discloses a battery and cover plate subassembly, its cover plate subassembly includes cover plate, pressure -relief mechanism is set up on the cover plate, insulating part includes body part and protruding part, body part sets up on the board surface of cover plate one side, protruding part sets up on the body part, and protruding part protrudes on the surface of body part away from the cover plate, protruding part with the opposite setting of at least a part of pressure -relief mechanism, protruding part includes bottom wall and the side wall of connection on bottom wall, is provided with first through -hole with pressure -relief mechanism intercommunication on the side wall, is provided with second through -hole with pressure -relief mechanism intercommunication on bottom wall, the minimum interval of first through -hole on bottom wall's projection and second through -hole is t mm, satisfies: 0.5 <= t <= 3. The utility model discloses such structure, can let the gas of battery inside release smoothly, avoids insulating part damage.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy battery technical field especially relates to a battery and cover plate subassembly thereof. BACKGROUND

[0002] At present, the cover plate of the battery is provided with a pressure relief device for releasing the gas in the battery. The side of the cover plate facing the inside of the battery is provided with an insulating piece, which abuts against the battery cell inside the battery. Once the gas in the battery cannot be discharged in time, the battery will swell, which may cause damage to the insulating piece. SUMMARY

[0003] The utility model discloses a battery and cover plate subassembly thereof, which can smoothly release the gas in the battery and avoid damage to the insulating piece.

[0004] To achieve the above-mentioned purpose, the utility model provides a cover plate subassembly, which comprises:

[0005] a cover plate;

[0006] a pressure relief mechanism arranged on the cover plate;

[0007] an insulating piece comprising a body portion and a protruding portion, wherein the body portion is arranged on the surface of one side of the cover plate, the protruding portion is arranged on the body portion, and the protruding portion protrudes from the surface of the body portion away from the cover plate, the protruding portion is arranged opposite to at least a part of the pressure relief mechanism, the protruding portion comprises a bottom wall and a side wall connected to the bottom wall, the side wall is provided with a first through hole in communication with the pressure relief mechanism, the bottom wall is provided with a second through hole in communication with the pressure relief mechanism, and the minimum distance between the projection of the first through hole on the bottom wall and the second through hole is t mm, satisfying 0.5≤t≤3.

[0008] The utility model further provides a battery, which comprises:

[0009] a shell;

[0010] a cover plate subassembly as described above arranged on the shell;

[0011] a battery cell arranged inside the shell, and the insulating piece is arranged between the cover plate and the battery cell.

[0012] The utility model provides a battery and cover plate subassembly thereof, which has the following beneficial effects compared with the prior art:

[0013] The utility model discloses a cover plate assembly, including cover plate, pressure relief mechanism and insulating piece, pressure relief mechanism sets up on the cover plate, and insulating piece sets up on the one side of cover plate and has the protruding portion corresponding with pressure relief mechanism, and the sidewall and bottom wall of protruding portion set up first through -hole and second through -hole respectively, by limiting the minimum spacing between first through -hole and second through -hole, when ensuring that the strength of protruding portion itself, still can let the gas in the battery reach pressure relief mechanism fast through first through -hole or second through -hole, let the gas in the battery release smoothly, avoid the thermal runaway of battery, simultaneously avoid the damage of insulating piece.

[0014] The utility model discloses a battery, including above -mentioned cover plate assembly, can let the gas in the battery release smoothly, avoid the thermal runaway of battery, simultaneously avoid the damage of insulating piece, avoid the damage of insulating piece. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the structure schematic diagram of the cover plate assembly of the utility model embodiment.

[0016] Figure 2 It is the structure schematic diagram of another angle of the cover plate assembly of the utility model embodiment.

[0017] Figure 3 It is the structure schematic diagram of the cover plate and pressure relief mechanism of the utility model embodiment.

[0018] Figure 4 It is the structure schematic diagram of the insulating piece of the utility model embodiment.

[0019] Figure 5 It is Figure 4 The enlarged schematic diagram of A in the figure.

[0020] Figure 6 It is Figure 5 The enlarged schematic diagram of B in the figure.

[0021] Figure 7 It is the structure schematic diagram of the battery of the utility model embodiment.

[0022] Figure 8 It is the structure schematic diagram of the battery inside the utility model embodiment.

[0023] In the figure, 1, cover plate;2, pressure relief mechanism;3, insulating piece;4, shell;5, electric core.

[0024] 21, main body part;22, weak part;31, main body part;32, protruding portion;311, third through -hole;321, bottom wall;322, sidewall;3211, second through -hole;3221, first through -hole;3222, first sidewall;3223, second sidewall. DETAILED DESCRIPTION

[0025] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0026] In the description of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] In addition, in the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0029] For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] Please refer to Figure 1 and Figure 2 The cover plate 1 assembly of the present application comprises: a cover plate 1, a pressure relief mechanism 2 and an insulating piece 3.

[0031] The pressure relief mechanism 2 is arranged on the cover plate 1.

[0032] The pressure relief mechanism 2 is arranged on the cover plate 1, and the pressure relief mechanism 2 is used to burst when the battery is in thermal runaway, so that the gas inside the battery is released to the outside of the battery.

[0033] Please refer to Figure 4 and Figure 5The insulation piece 3 comprises a body part 31 and a protruding part 32, the body part 31 is arranged on the plate surface of one side of the cover plate 1, the protruding part 32 is arranged on the body part 31, and the protruding part 32 protrudes from the surface of the body part 31 away from the cover plate 1, the protruding part 32 is arranged opposite to at least part of the pressure relief mechanism 2, the protruding part 32 comprises a bottom wall 321 and a side wall 322 connected to the bottom wall 321, the side wall 322 is provided with a first through hole 3221 in communication with the pressure relief mechanism 2, the bottom wall 321 is provided with a second through hole 3211 in communication with the pressure relief mechanism 2, the minimum distance between the projection of the first through hole 3221 on the bottom wall 321 and the second through hole 3211 is t mm, and the following condition is met: 0.5≤t≤3.

[0034] The body part 31 is arranged on the plate surface of one side of the cover plate 1, and the body part 31 can be fixedly connected with the cover plate 1. Specifically, a plug column can be arranged on the body part 31, a plug hole matched with the plug column is arranged on the cover plate 1, and the plug column is inserted into the plug hole to form the assembly of the body part 31 and the cover plate 1.

[0035] The protruding part 32 is used to abut against the battery cell 5 inside the battery, the cover plate assembly abuts against the battery cell 5 through the protruding part 32, and the first through hole 3221 and the second through hole 3211 can both allow the gas inside the battery to pass through and reach the pressure relief mechanism 2, so that the pressure relief mechanism 2 is discharged to the outside of the battery.

[0036] The first through hole 3221 can extend to the bottom wall 321 or not. For the case that the first through hole 3221 does not extend to the bottom wall 321, the projection of the first through hole 3221 on the bottom wall 321 is part of the side wall 322, and t is also the distance between the projection of the side wall 322 on the bottom wall 321 and the second through hole 3211.

[0037] When the above range is met, the strength of the protruding part 32 itself is ensured, and at the same time, the gas inside the battery can quickly reach the pressure relief mechanism 2 through the first through hole 3221 or the second through hole 3211, the gas inside the battery is smoothly released, the occurrence of thermal runaway of the battery is avoided, and at the same time, the damage of the insulation piece 3 is avoided. If t is too large, the total area of the second through hole 3211 on the bottom wall 321 is small, although the strength of the bottom wall 321 is high in this way, the efficiency of the gas inside the battery leaving the battery is reduced, the pressure relief speed is slow, the internal gas pressure of the battery is too large, and the risk of thermal runaway of the battery is increased. If t is too small, the strength of the protruding part 32 is small, the protruding part 32 abuts against the battery cell 5, and structural damage is prone to occur. If the battery swells or is subjected to a certain impact, the insulation piece 3 is prone to be damaged.

[0038] When measuring t, a general length measuring tool can be used, such as a ruler or a tape measure.

[0039] When measuring, first mark the projection of the first through hole 3221 on the bottom wall 321, then measure the distance between the two closest points between the projection and the second through hole 3211, measure multiple times and take the average to obtain the minimum distance t of the projection of the first through hole 3221 on the bottom wall 321 and the second through hole 3211.

[0040] In this embodiment, preferably, t can take values of 1, 1.5, 2, 2.5, etc.

[0041] In some embodiments, the area of the first through hole 3221 is S1 mm 2 , and the area of the second through hole 3211 is S2 mm 2 , satisfying: S1 < S2.

[0042] The second through hole 3211 directly abuts against the battery cell 5, and the gas in the battery cell 5 can directly pass through the second through hole 3211 to the direct impact pressure relief mechanism 2, or first flow from the battery cell 5 to the first through hole 3221, and then flow from the first through hole 3221 to the pressure relief mechanism 2.

[0043] When the gas inside the battery is released, the gas passing through the first through hole 3221 needs to change direction to impact the pressure relief mechanism 2, while the gas passing through the second through hole 3211 can directly impact the pressure relief mechanism 2. By setting S1 < S2, the gas inside the battery cell 5 is more likely to flow to the second through hole 3211, and the pressure relief mechanism 2 is more likely to be broken.

[0044] When measuring S1 and S2, the area S1 of the first through hole 3221 refers to the area taken parallel to the side wall 322, and the area S2 of the second through hole 3211 refers to the area of its own contour.

[0045] In some embodiments, the area S1 of the first through hole 3221 and the area S2 of the second through hole 3211 also satisfy: 0.1 ≤ S1 / S2 ≤ 0.5. Preferably, S1 / S2 can take values of 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, etc.

[0046] The S1 / S2 ratio cannot be too small, otherwise the area of the first through hole 3221 will be too small, which will not be conducive to the gas passing through the first through hole 3221 of the side wall 322 to be released to the position of the pressure relief mechanism 2. The second through hole 3211 directly abuts against the battery cell 5, and the gas in other parts of the battery cell 5 can only pass through the first through hole 3221 of the side wall 322 to reach the pressure relief mechanism 2 quickly. If the S1 / S2 ratio is too large, that is, the area of the first through hole 3221 is too small, or the area of the second through hole 3211 is too large, the supporting performance of the side wall 322 will be poor, and the part directly abutting against the protruding portion 32 will also not be conducive to the gas being released quickly from the second through hole 3211.

[0047] In some embodiments, the first through hole 3221 extends to the bottom wall 321.

[0048] With such a structure, the area of the first through hole 3221 can be ensured to be large enough, so that the gas inside the battery can flow to the pressure relief mechanism 2 through the first through hole 3221, ensuring the pressure relief efficiency. Moreover, the protruding part 32 is against the battery cell 5, so the gas flowing through the second through hole 3211 is limited, and such an arrangement can also improve the flowability of the gas inside the battery.

[0049] Please refer to Figure 6 In the length direction of the cover plate 1, the size of the projection of the first through hole 3221 on the plane of the bottom wall 321 is d1 mm, the size of the projection of the side wall 322 on the plane of the bottom wall 321 is d2 mm, and the size of the bottom wall 321 is D mm, satisfying: 0.05≤(d1-d2) / D≤0.2. Preferably, (d1-d2) / D can take values such as 0.08, 0.1, 0.12, 0.15, 0.18, etc.

[0050] If (d1-d2) takes a large value, the size of the bottom wall 321 also needs to be large, otherwise, if the extension size of the first through hole 3221 is too large and the size of the bottom wall 321 is small, the strength of the bottom wall 321 is insufficient, and the insulating part 3 is easily damaged, and if (d1-d2) takes a too small value, the area of the first through hole 3221 will be limited, which is not conducive to the rapid release of the gas.

[0051] The length direction of the cover plate 1 is the length direction of the battery.

[0052] When satisfying the above range, neither the size of the second through hole 3211 is affected, nor the supporting area of the bottom wall 321 is reduced, ensuring the strength of the insulating part 3. If the value is too small, the size of the second through hole 3211 will be affected, and if the value is too large, the supporting area of the bottom wall 321 will be reduced, and the insulating part 3 is easily damaged.

[0053] When measuring d1, d2 and D, common length measuring tools can be used, such as ruler, tape measure, etc.

[0054] When measuring d1, the projection of the first through hole 3221 on the bottom wall 321 can be marked first, and then the distance of the projection in the length direction of the cover plate 1 is measured, and the average value is taken after multiple measurements, to obtain the size d1 of the projection of the first through hole 3221 on the plane of the bottom wall 321.

[0055] When measuring d2, the distance between the two plate surfaces of the side wall 322 in the length direction of the cover plate 1, that is, the thickness of the side wall 322, is measured, and the average value is taken after multiple measurements, to obtain the size d2 of the projection of the side wall 322 on the plane of the bottom wall 321.

[0056] When measuring D, the distance between the two edges of the bottom wall 321 in the length direction of the cover plate 1 is measured multiple times and averaged to obtain the size D of the bottom wall 321.

[0057] In this case, the size d1 of the projection of the first through hole 3221 on the plane of the bottom wall 321 and the size d2 of the projection of the side wall 3222 on the plane of the bottom wall 321 also satisfy: 0≤(d1-d2)≤2.5. Preferably, (d1-d2) can take values of 0.5, 1, 1.5, 2, etc.

[0058] When this range is satisfied, (d1-d2) can be avoided from being too small, and the area of the first through hole 3221 can be avoided from being too small, so that the gas inside the battery cannot quickly reach the pressure relief mechanism 2 through the first through hole 3221. When the first through hole 3221 extends to the bottom wall 321, the size of the first through hole 3221 occupying the side wall 322 can be set to be smaller, reducing the impact on the strength of the side wall 322. (d1-d2) also cannot be too large, otherwise it will cause the strength of the bottom wall 321 to be poor, or the area of the second through hole 3211 has to be reduced in order to ensure the strength of the bottom wall 321.

[0059] In some embodiments, the number of first through holes 3221 is multiple, and the multiple first through holes 3221 are arranged in sequence along the width direction of the cover plate 1, the distance between adjacent two first through holes 3221 is L1 mm, the size of the protruding portion 32 in the width direction of the cover plate 1 is L2 mm, and 0.05≤L1 / L2≤0.15 is satisfied. Preferably, L1 / L2 can take values of 0.06, 0.08, 0.1, 0.12, 0.14, etc.

[0060] The setting of multiple holes can facilitate the flow of gas inside the battery to the pressure relief mechanism 2.

[0061] When the above range is satisfied, the first through hole 3221 is not too dense, preventing the strength of the protruding portion 32 from being insufficient, while also ensuring the pressure relief efficiency.

[0062] In some embodiments, the body portion 31 is provided with a third through hole 311 in communication with the pressure relief mechanism 2, and the area of the first through hole 3221 and the area of the second through hole 3211 are both smaller than the area of the third through hole 311.

[0063] Please refer to Figure 3 , the pressure relief mechanism 2 includes a main body portion 21 and a weak portion 22, the weak portion 22 is arranged around the main body portion 21, and the main body portion 21 is arranged on the cover plate 1 through the weak portion 22, and the third through hole 311 is arranged opposite at least a part of the weak portion 22.

[0064] The weak portion 22 can be arranged in a circumferential direction of the main body portion 21, or can be arranged in a non-circumferential direction. The weak portion 22 is formed by punching or etching.

[0065] In this embodiment, the weak portion 22 and the cover plate 1 are connected to each other, and the pressure relief mechanism 2 is arranged on the cover plate 1 as a whole.

[0066] The weak portion 22 is the weakest portion of the pressure relief mechanism 2. When the gas reaches the pressure relief mechanism 2 through the third through hole 311, the weak portion 22 can be quickly punched to cause the pressure relief mechanism 2 to be punched as a whole, and the gas inside the battery can be released. The third through hole 311 is arranged at least partially opposite to the weak portion 22, so that the gas inside the battery can reach the pressure relief mechanism 2 more quickly, and the weak portion 22 can be more easily punched.

[0067] In some embodiments, the side wall 322 includes a first side wall 3222 and a second side wall 3223 arranged opposite to each other, and the first side wall 3222 and the second side wall 3223 are both provided with the first through hole 3221. The first through hole 3221 on the first side wall 3222 and the first through hole 3221 on the second side wall 3223 are arranged staggered.

[0068] Through such an arrangement, when the gas inside the battery flows to the pressure relief mechanism 2 through the first through hole 3221, the gas passing through the first through hole 3221 can be blocked by the other side wall 322, so that the gas can flow to the pressure relief mechanism 2. The first through hole 3221 on the first side wall 3222 and the first through hole 3221 on the second side wall 3223 are arranged staggered to prevent the gas from flowing back to the inside of the battery after passing through one of the first through holes 3221 and then flowing out from the first through hole 3221 of the other side wall 322.

[0069] The first through hole 3221 on the first side wall 3222 and the first through hole 3221 on the second side wall 3223 can be arranged staggered in a width direction of the cover plate 1, or can be arranged staggered in a thickness direction of the cover plate 1.

[0070] The width direction of the cover plate 1 is the width direction of the battery, and the thickness direction of the cover plate 1 is the height direction of the battery. The thickness direction of the cover plate 1 is also the thickness direction of the protruding portion 32.

[0071] The first through hole 3221 on the first side wall 3222 and the first through hole 3221 on the second side wall 3223 are arranged staggered by a distance T mm, and satisfy 0.2≤T≤3. Preferably, T can be 0.5, 1, 1.5, 2, 2.5, etc.

[0072] The distance T refers to the distance between the first through hole 3221 on the first side wall 3222 and the corresponding first through hole 3221 on the second side wall 3223, as shown in Figure 5In the embodiment, the protruding portion 32 is staggered by a distance at one end in the width direction of the cover plate 1, that is, the first through hole 3221 on the end of each of the first side wall 3222 and the second side wall 3223 in the same direction.

[0073] When the range is satisfied, the gas flow to the pressure relief mechanism 2 can be ensured, and the first through hole 3221 is not arranged too sparsely to affect the pressure relief efficiency.

[0074] When measuring T, a common length measuring tool can be used, such as a ruler or a tape measure.

[0075] Specifically, the first through hole 3221 on one side wall 322 can be marked on the other side wall 322, and the distance between the first through hole 3221 and the mark is measured, and the average of multiple measurements is obtained to obtain the staggered distance T of the first through hole 3221 on the first side wall 3222 and the first through hole 3221 on the second side wall 3223.

[0076] The embodiment also provides a battery, please refer to Figure 7 and Figure 8 , comprising a shell 4, the cover plate 1 assembly described above, and an electric core 5.

[0077] The cover plate 1 assembly is arranged on the shell 4.

[0078] The shell 4 is internally provided with a receiving cavity for placing the electric core 5, and an open top surface of the shell 4 is provided with an opening communicating with the receiving cavity, and the opening is used to place the electric core 5. The cover plate 1 assembly is arranged on the opening and closes the opening.

[0079] The cover plate 1 closes the opening to form a closed space in the receiving cavity inside the battery. The cover plate 1 is also provided with an electrode terminal, such as a pole assembly for connecting the electric core 5 and an external circuit.

[0080] The electric core 5 is arranged inside the shell 4, and the insulating member 3 is arranged between the cover plate 1 and the electric core 5.

[0081] The insulating member 3 is located on the side of the cover plate 1 facing the electric core 5, so that the protruding portion 32 abuts against the electric core 5.

[0082] Through such a structure, while ensuring the strength of the protruding portion 32 itself, the gas inside the battery can quickly reach the pressure relief mechanism 2 through the first through hole 3221 or the second through hole 3211, so that the gas inside the battery is smoothly released, and the insulating member 3 is prevented from being damaged.

[0083] The above merely is the preferred implementation form of the present application, and it should be noted that, for the ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, and these improvements and substitutions should also be considered as the protection scope of the present application.

Claims

1. A cover assembly, characterized by The cover plate comprises: a pressure relief mechanism arranged on the cover plate; an insulating piece comprising a body portion arranged on one side of the cover plate and a protruding portion arranged on the body portion and protruding from the surface of the body portion away from the cover plate, the protruding portion being arranged opposite at least a portion of the pressure relief mechanism, the protruding portion comprising a bottom wall and a side wall connected to the bottom wall, the side wall being provided with a first through hole in communication with the pressure relief mechanism, and the bottom wall being provided with a second through hole in communication with the pressure relief mechanism, the minimum distance between the projection of the first through hole on the bottom wall and the second through hole being tmm, satisfying: 0.5≤t≤3.

2. The cover plate assembly according to claim 1, wherein 3. The cover plate assembly according to claim 2, wherein The first through hole has an area of S1 mm 2 The second through hole has an area of S2 mm 2 S1 < S2 is satisfied. the area S1 of the first through hole and the area S2 of the second through hole also satisfy: 0.1≤S1 / S2≤0.

5.

4. The cover plate assembly according to claim 1, wherein the first through hole extends to the bottom wall.

5. The cover plate assembly according to claim 4, wherein in the length direction of the cover plate, the size of the projection of the first through hole on the plane of the bottom wall is d1mm, the size of the projection of the side wall on the plane of the bottom wall is d2mm, and the size of the bottom wall is Dmm, satisfying: 0.05≤(d1-d2) / D≤0.

2.

6. The cover plate assembly according to claim 5, wherein the size d1 of the projection of the first through hole on the bottom wall and the size d2 of the projection of the side wall on the plane of the bottom wall also satisfy: 0≤(d1-d2)≤2.

5.

7. The cover plate assembly according to claim 1, wherein the number of the first through holes is multiple, the multiple first through holes are arranged in sequence in the width direction of the cover plate, the distance between two adjacent first through holes is L1mm, and the size of the protruding portion in the width direction of the cover plate is L2mm, satisfying: 0.05≤L1 / L2≤0.

15.

8. The cover plate assembly according to claim 1, wherein the body portion is provided with a third through hole in communication with the pressure relief mechanism, and the area of the first through hole and the area of the second through hole are both smaller than the area of the third through hole; the pressure relief mechanism comprises a main body portion and a weak portion, the weak portion is arranged around the main body portion, and the main body portion is arranged on the cover plate through the weak portion, and the third through hole is arranged opposite at least a portion of the weak portion.

9. The cover plate assembly according to claim 1, wherein the side wall comprises a first side wall and a second side wall arranged opposite to each other, the first side wall and the second side wall are both provided with the first through hole, and the position of the first through hole on the first side wall and the position of the first through hole on the second side wall are arranged staggered.

10. The cover plate assembly according to claim 9, wherein ​ In a width direction of the cover plate, the first through-hole position on the first side wall and the first through-hole position on the second side wall are arranged staggeredly. Alternatively, in a thickness direction of the cover plate, the first through-hole position on the first side wall and the first through-hole position on the second side wall are arranged staggeredly.

11. The cover plate assembly according to claim 9, characterized in that, The first through-hole position on the first side wall and the first through-hole position on the second side wall are arranged staggeredly by a distance T mm, satisfying: 0.2≤T≤3.

12. A battery, characterized by Comprise: A shell; The cover plate assembly according to any one of claims 1-11 is arranged on the shell; An electric core is arranged inside the shell, and the insulating piece is arranged between the cover plate and the electric core.

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