Insulation parts, battery covers and batteries

Abstract

The present invention relates to the field of battery technology, and discloses an insulating member, a battery cover plate, and a battery, comprising: a main body, one side of the main body is convexly arranged to form a support portion, the interior of the support portion is hollowly arranged to form an exhaust groove on the main body, and the support portion is provided with a through hole; a baffle plate is arranged in the exhaust groove, and is connected to the groove wall and the groove bottom of the exhaust groove to separate the exhaust groove into a plurality of sub-grooves, and the sub-grooves are connected to the through hole. The present invention sets a baffle plate in the exhaust groove to separate the exhaust groove into a plurality of sub-grooves. When the battery is inverted, the electrolyte is distributed in the plurality of sub-grooves. When the battery is vibrated, the baffle plate blocks the shaking of the electrolyte, reduces the shaking of the electrolyte, thereby reducing the impact of the electrolyte on the explosion-proof valve, avoiding damage to the explosion-proof valve, achieving the protection of the explosion-proof valve, and avoiding battery leakage and premature opening of the explosion-proof valve.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to an insulating member, a battery cover and a battery. Background Art

[0002] In order to ensure the safety performance of the battery, an explosion-proof valve is usually set on the bare aluminum plate, and the gas generated in the battery is discharged through the explosion-proof valve to prevent the battery from getting out of control and exploding. Usually, a lower plastic is set between the bare aluminum plate and the pole group, and the lower plastic is used to press the pole group. At the same time, the lower plastic forms a cavity to connect the inside of the battery and the explosion-proof valve to form an exhaust space. At present, in the field of vehicles, based on safety considerations, the battery pack is in an inverted state when installed in the vehicle, that is, the explosion-proof valve is set toward the bottom of the vehicle, thereby reducing the harm caused by the battery getting out of control. However, when the battery is inverted, the electrolyte in the battery will gather in the exhaust space of the lower plastic. When the battery is vibrated, the electrolyte will swing back and forth in the exhaust space, thereby continuously impacting the explosion-proof valve, causing damage to the explosion-proof valve, and then causing battery leakage and premature opening of the explosion-proof valve. Summary of the invention

[0003] In view of this, the present invention provides an insulating member, a battery cover and a battery to solve the problem in the prior art that when the battery is inverted, the electrolyte continuously impacts the explosion-proof valve, causing damage to the explosion-proof valve, which in turn causes battery leakage and premature opening of the explosion-proof valve.

[0004] In the first aspect, the present invention provides an insulating member, which is applied to a battery cover, comprising: a main body, one side of which is convexly arranged to form a supporting portion, the interior of the supporting portion is hollow to form an exhaust groove on the main body, and the supporting portion is provided with a through hole; a baffle, which is arranged in the exhaust groove and connected to the groove wall and the groove bottom of the exhaust groove to divide the exhaust groove into a plurality of sub-grooves, the sub-grooves are connected to the through hole, and the volume of each of the sub-grooves accounts for 10% to 20% of the volume of the exhaust groove.

[0005] Beneficial effect: By arranging a baffle in the exhaust groove to divide the exhaust groove into several sub-grooves, when the battery is inverted, the electrolyte is distributed in the several sub-grooves, and when the battery is vibrated, the baffle will block the shaking of the electrolyte and reduce the shaking of the electrolyte, thereby reducing the impact of the electrolyte on the explosion-proof valve and avoiding damage to the explosion-proof valve, thereby protecting the explosion-proof valve and avoiding battery leakage and premature opening of the explosion-proof valve; by limiting the ratio of the volume of the sub-grooves to the volume of the exhaust grooves, the exhaust effect of the sub-grooves is guaranteed while improving the effect of reducing the shaking of the electrolyte.

[0006] In an optional embodiment, the baffle includes a first plate body, which is extended along the y direction and divides the exhaust groove along the x direction to form a plurality of corresponding sub-grooves in the x direction.

[0007] In an optional implementation, along the x direction, the length of the exhaust groove is E, the length of the sub-groove is A, and 1 / 3×E≤A≤1 / 2×E is satisfied; and / or,

[0008] Along the x direction, the length of the sub-slot is A, satisfying 5mm≤A≤15mm.

[0009] Beneficial effect: The sub-slot has a suitable length, which improves the effect of reducing electrolyte sloshing and ensures the exhaust effect of the sub-slot.

[0010] In an optional embodiment, the baffle includes a second plate body, which is extended along the x-direction and divides the exhaust groove along the y-direction to form a plurality of corresponding sub-grooves in the y-direction.

[0011] In an optional implementation, along the y direction, the width of the exhaust groove is F, the width of the sub-slot is B, and 1 / 6×F≤B≤1 / 3×F is satisfied; and / or,

[0012] Along the y direction, the width of the sub-slot is B, satisfying 3mm≤B≤16mm.

[0013] Beneficial effect: The sub-slot has a suitable width, which improves the effect of reducing electrolyte sloshing and ensures the exhaust effect of the sub-slot.

[0014] In an optional embodiment, the baffle includes a first plate body and a second plate body, the first plate body extends along the y direction and divides the exhaust groove along the x direction, and the second plate body extends along the x direction and divides the exhaust groove along the y direction.

[0015] In an optional implementation, along the x-direction, the length of the sub-groove is A, and along the y-direction, the width of the sub-groove is B, satisfying 1 / 2×A≤B≤1.3×A.

[0016] Beneficial effect: Providing the sub-tank with a suitable volume can not only improve the effect of reducing electrolyte sloshing, but also ensure the exhaust effect of the sub-tank.

[0017] In an optional implementation, along the x direction, the length of the exhaust groove is E, which satisfies 10 mm ≤ E ≤ 30 mm; and / or,

[0018] Along the y direction, the width of the exhaust groove is F, which satisfies 20 mm ≤ F ≤ 50 mm; and / or,

[0019] The thickness of the baffle is D, which satisfies 0.5 mm ≤ D ≤ 1 mm.

[0020] Beneficial effects: The length and / or width of the exhaust groove is limited so that the size of the exhaust groove can be adapted to the size of the explosion-proof valve, so that the gas in the battery can be discharged through the exhaust groove and the explosion-proof valve;

[0021] By limiting the thickness of the baffle, the structural strength of the baffle itself is ensured while avoiding waste of material and excessive occupation of the exhaust groove space.

[0022] In a second aspect, the present invention further provides a battery cover, comprising the above-mentioned insulating member.

[0023] In a third aspect, the present invention further provides a battery, comprising the above-mentioned battery cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A bottom view of a battery of the related art;

[0026] Figure 2 for Figure 1 Sectional view in the AA direction;

[0027] Figure 3 A schematic diagram of the structure of an insulating member of the related art;

[0028] Figure 4 A schematic diagram of the exploded structure of a battery in the related art;

[0029] Figure 5 is a schematic structural diagram of an insulating member according to an embodiment of the present invention;

[0030] Figure 6 for Figure 5 A front view of the insulating member is shown.

[0031] Description of reference numerals:

[0032] 1. Main body; 11. Support part; 111. Through hole; 12. Exhaust groove; 121. Sub-slot; 2. Baffle; 21. First plate body; 22. Second plate body; 10. Insulator; 20. Cover plate; 30. Connecting piece; 40. Pole group; 50. Shell; 60. Blue film. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0034] Combine the following Figure 5 and Figure 6 , describing an embodiment of the present invention.

[0035] According to an embodiment of the present invention, on the one hand, an insulating member 10 is provided, which is applied to a battery cover 20, including: a main body 1, one side of the main body 1 is protruding to form a support portion 11, the interior of the support portion 11 is hollow to form an exhaust groove 12 on the main body 1, and the support portion 11 is provided with a through hole 111; a baffle 2, which is arranged in the exhaust groove 12 and is connected to the groove wall and the groove bottom of the exhaust groove 12 to divide the exhaust groove 12 into a plurality of sub-grooves 121, and the sub-grooves 121 are connected to the through hole 111.

[0036] By arranging a baffle 2 in the exhaust groove 12 to divide the exhaust groove 12 into a plurality of sub-grooves 121, when the battery is inverted, the electrolyte is distributed in the plurality of sub-grooves 121. When the battery is vibrated, the baffle 2 will block the shaking of the electrolyte and reduce the shaking of the electrolyte, thereby reducing the impact of the electrolyte on the explosion-proof valve and avoiding damage to the explosion-proof valve, thereby protecting the explosion-proof valve and avoiding battery leakage and premature opening of the explosion-proof valve.

[0037] It is worth noting that in the related art, please refer to Figure 4 The main structure of the square battery includes the cover plate 20 (which integrates the pole, explosion-proof valve, upper plastic, lower plastic, and injection hole), the connecting piece 30, the pole group 40, the shell 50, and the blue film 60. After the cover plate 20 and the shell 50 are laser welded, a closed space with a certain mechanical strength is formed to protect the pole group 40; the pole group 40 is wrapped with an insulating sheet and the lower plastic (i.e., the insulating member 10) and fixed by hot melt; the support part 11 of the lower plastic presses the diaphragm of the pole group 40, so that the pole group 40 is stably fixed in the shell 50 to prevent the pole group 40 from shaking and causing internal short circuit. Please refer to Figures 1 to 3 When the battery is inverted, the electrolyte enters the exhaust groove 12 through the through hole 111 provided in the support portion 11, and shakes when the battery vibrates, thereby causing an impact on the explosion-proof valve.

[0038] In this embodiment, see Figure 5 and Figure 6 A baffle 2 is arranged in the exhaust groove 12. When the electrolyte in the exhaust groove 12 shakes, the baffle 2 can block the electrolyte, thereby slowing down the shaking of the electrolyte and further reducing the impact on the explosion-proof valve.

[0039] In one embodiment, Figure 5 and Figure 6 As shown, the baffle 2 includes a first plate body 21 , which is extended along the y direction and divides the exhaust groove 12 along the x direction to form a plurality of sub-grooves 121 corresponding to the x direction.

[0040] It is worth mentioning that please refer to Figure 5 and Figure 6 One side surface of the first plate body 21 is connected to the bottom of the exhaust groove 12 along the y direction, and the two end surfaces of the first plate body 21 in the y direction are respectively connected to the two opposite groove walls of the exhaust groove 12.

[0041] In one embodiment, Figure 6 As shown, along the x direction, the length of the exhaust groove 12 is E, and the length of the sub-groove 121 is A, satisfying 1 / 3×E≤A≤1 / 2×E.

[0042] In one embodiment, Figure 6 As shown, along the x direction, the length of the sub-slot 121 is A, satisfying 5 mm ≤ A ≤ 15 mm.

[0043] It should be noted that the sub-slot 121 has a suitable length to improve the effect of reducing the sloshing of the electrolyte while ensuring the exhaust effect of the sub-slot 121. Specifically, if the length of the sub-slot 121 is too small, the gas generated inside the battery cannot easily enter the sub-slot 121, affecting the normal exhaust of the battery; if the length of the sub-slot 121 is too large, the electrolyte in the sub-slot 121 is still prone to greater sloshing, and the impact on the explosion-proof valve is still relatively large.

[0044] It should be further explained that, among the plurality of sub-slots 121 formed along the x-direction, the lengths of each sub-slot 121 may be the same or different.

[0045] In one embodiment, Figure 5 and Figure 6 As shown, the baffle 2 includes a second plate body 22 , which is extended along the x direction and divides the exhaust groove 12 along the y direction to form a plurality of sub-grooves 121 corresponding to the y direction.

[0046] It is worth mentioning that please refer to Figure 5 and Figure 6One side surface of the second plate body 22 is connected to the bottom of the exhaust groove 12 along the x direction, and the two end surfaces of the first plate body 21 in the x direction are respectively connected to the two opposite groove walls of the exhaust groove 12.

[0047] In one embodiment, Figure 6 As shown, along the y direction, the width of the exhaust groove 12 is F, and the width of the sub-slot 121 is B, satisfying 1 / 6×F≤B≤1 / 3×F.

[0048] In one embodiment, Figure 6 As shown, along the y direction, the width of the sub-slot 121 is B, satisfying 3mm≤B≤16mm.

[0049] It should be noted that the sub-slot 121 has a suitable width, which can improve the effect of reducing the sloshing of the electrolyte while ensuring the exhaust effect of the sub-slot 121. Specifically, if the width of the sub-slot 121 is too small, the gas generated inside the battery cannot easily enter the sub-slot 121, affecting the normal exhaust of the battery; if the width of the sub-slot 121 is too large, the electrolyte in the sub-slot 121 is still prone to greater sloshing, and the impact on the explosion-proof valve is still relatively large.

[0050] It should be further explained that, among the plurality of sub-grooves 121 formed along the y direction, the widths of each sub-groove 121 may be the same or different.

[0051] It is worth noting that, in this embodiment, Figure 5 and Figure 6 As shown, the baffle 2 includes a first plate body 21 and a second plate body 22. The first plate body 21 is extended along the y direction and divides the exhaust groove 12 along the x direction. The second plate body 22 is extended along the x direction and divides the exhaust groove 12 along the y direction. That is, a plurality of sub-grooves 121 are provided along the x direction and the y direction.

[0052] Of course, in other alternative embodiments, the baffle 2 may include only the first plate body 21 or only the second plate body 22 .

[0053] It should be noted that one or more first plates 21 may be provided; and one or more second plates 22 may also be provided.

[0054] It is worth noting that the baffle 2 may also include other irregular shapes or plates arranged along other directions.

[0055] In one embodiment, the volume of each sub-slot 121 accounts for 10% to 20% of the volume of the exhaust groove 12. By limiting the ratio of the volume of the sub-slot 121 to the volume of the exhaust groove 12, the exhaust effect of the sub-slot 121 is ensured while improving the effect of reducing electrolyte sloshing.

[0056] It is worth noting that, along the z direction, the groove depth of the sub-groove 121 is the same as the groove depth of the exhaust groove 12 , and therefore, it can be concluded that 10%≤(A×B) / (E×F)≤20%.

[0057] In one embodiment, Figure 6 As shown, along the x direction, the length of the sub-groove 121 is A, and along the y direction, the width of the sub-groove 121 is B, satisfying 1 / 2×A≤B≤1.3×A. Providing the sub-groove 121 with a suitable volume can not only improve the effect of reducing the sloshing of the electrolyte, but also ensure the exhaust effect of the sub-groove 121. Specifically, if the volume of the sub-groove 121 is too small, it is not easy for the gas generated inside the battery to enter the sub-groove 121, affecting the normal exhaust of the battery; if the volume of the sub-groove 121 is too large, the electrolyte in the sub-groove 121 is still prone to large shaking, and the impact on the explosion-proof valve is still large.

[0058] It is worth noting that the bottom wall of the support portion 11 (i.e., the bottom of the exhaust groove 12) and the side wall of the support portion 11 (i.e., the groove wall of the exhaust groove 12) are both provided with a plurality of through holes 111. Furthermore, the connection between the first plate body 21 and the bottom wall and the side wall is located between two adjacent through holes 111, and the connection between the second plate body 22 and the bottom wall and the side wall is located between two adjacent through holes 111.

[0059] In one embodiment, Figure 6 As shown, along the x direction, the length of the exhaust groove 12 is E, which satisfies 10 mm ≤ E ≤ 30 mm.

[0060] In one embodiment, Figure 6 As shown, along the y direction, the width of the exhaust groove 12 is F, which satisfies 20 mm ≤ F ≤ 50 mm.

[0061] It should be noted that the length and / or width of the exhaust groove 12 is limited so that the size of the exhaust groove 12 can be adapted to the size of the explosion-proof valve, so that the gas in the battery can be discharged through the exhaust groove 12 and the explosion-proof valve.

[0062] In one embodiment, Figure 6 As shown, the thickness of the baffle plate 2 is D, which satisfies 0.5 mm ≤ D ≤ 1 mm. By limiting the thickness of the baffle plate 2, while ensuring the structural strength of the baffle plate 2 itself, the waste of materials and excessive occupation of the exhaust groove 12 space are avoided.

[0063] It should be noted that the insulating member 10 is usually formed by injection molding. Figure 3 The insulating member 10 in the related art shown in the figure and the baffle 2 provided in the present embodiment can be simultaneously formed during the injection molding process, and have a simple structure and are easy to process without increasing the processing cost.

[0064] The following is an inverted vibration test or a drop test, as well as an explosion-proof valve opening test, on batteries equipped with different insulating members 10. The test results of the embodiment battery and the comparative example battery are shown in Table 1 and Table 2. Among them, the embodiment battery refers to a battery whose insulating member 10 meets the requirements of this embodiment, and correspondingly, the comparative example battery refers to a battery whose insulating member 10 does not meet the requirements of this embodiment. In addition, the explosion-proof valve design opening pressure of the battery in Table 1 is (0.9±0.2) MPa, and the explosion-proof valve design opening pressure of the battery in Table 2 is (0.6±0.2) MPa.

[0065] Table 1 Test results of the battery of the embodiment and the battery of the comparative example

[0066]

[0067] Table 2 Test results of the battery of the embodiment and the battery of the comparative example

[0068]

[0069] It can be seen from Table 1 that in Examples 1 to 6, 10%≤(A×B) / (E×F)≤20% is satisfied. Therefore, in the batteries of Examples 1 to 6, the electrolyte does not open the explosion-proof valve in the inverted vibration test or the drop test, and in the explosion-proof valve opening test, the actual opening pressure of the explosion-proof valve satisfies (0.9±0.2) MPa, that is, in the range of 0.7 MPa to 1.1 MPa.

[0070] It can be seen from Table 1 that in Comparative Examples 1 and 2, (A×B) / (E×F) is less than 10%. Although the electrolyte did not open the explosion-proof valve in the inverted vibration test or the drop test, the actual opening pressure of the explosion-proof valve exceeded 1.1 MPa in the explosion-proof valve opening test.

[0071] It can be seen from Table 1 that in Comparative Examples 3 and 4, (A×B) / (E×F)>20%, and the explosion-proof valve is opened by the electrolyte in the inverted vibration test or the drop test. Moreover, due to the impact of the electrolyte, the actual opening pressure of the explosion-proof valve is lower than 0.7MPa in the explosion-proof valve opening test.

[0072] It can be seen from Table 2 that in Examples 7 to 12, 10%≤(A×B) / (E×F)≤20% is satisfied. Therefore, in the batteries of Examples 7 to 12, the electrolyte does not open the explosion-proof valve in the inverted vibration test or the drop test, and in the explosion-proof valve opening test, the actual opening pressure of the explosion-proof valve satisfies (0.6±0.2) MPa, that is, in the range of 0.4 MPa to 0.8 MPa.

[0073] It can be seen from Table 2 that in Comparative Examples 5 and 6, (A×B) / (E×F) is less than 10%. Although the electrolyte did not open the explosion-proof valve in the inverted vibration test or the drop test, the actual opening pressure of the explosion-proof valve exceeded 0.8 MPa in the explosion-proof valve opening test.

[0074] It can be seen from Table 2 that in Comparative Examples 7 and 8, (A×B) / (E×F)>20%, and the explosion-proof valve is opened by the electrolyte in the inverted vibration test or the drop test. Moreover, due to the impact of the electrolyte, the actual opening pressure of the explosion-proof valve is lower than 0.4MPa in the explosion-proof valve opening test.

[0075] According to an embodiment of the present invention, on the other hand, a battery cover plate 20 is provided, comprising the above-mentioned insulating member 10 .

[0076] According to an embodiment of the present invention, in another aspect, a battery is provided, comprising the battery cover 20 mentioned above.

[0077] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An insulating member, applied to a battery cover plate and the battery is inverted, characterized in that: include: A main body, wherein one side of the main body is convexly arranged to form a support portion, the interior of the support portion is hollow to form an exhaust groove on the main body, and the support portion is provided with a through hole; a baffle, arranged in the exhaust groove and connected to the groove wall and the groove bottom of the exhaust groove, so as to divide the exhaust groove into a plurality of sub-grooves, wherein the sub-grooves are connected to the through hole, and the volume of each sub-groove accounts for 10% to 20% of the volume of the exhaust groove; The baffle includes a first plate body, the first plate body is extended along the y direction, and divides the exhaust groove along the x direction to form a plurality of the sub-grooves correspondingly in the x direction, and along the x direction, the exhaust groove has a length E, and the sub-grooves have a length A, satisfying 1 / 3×E≤A≤1 / 2×E, and / or 5mm≤A≤15mm; and / or, The baffle includes a second plate body, which extends along the x direction and divides the exhaust groove along the y direction to form a plurality of corresponding sub-grooves in the y direction. Along the y direction, the width of the exhaust groove is F, and the width of the sub-grooves is B, satisfying 1 / 6×F≤B≤1 / 3×F, and / or 3mm≤B≤16mm.

2. The insulating member according to claim 1, characterized in that The baffle includes a first plate body and a second plate body, wherein the first plate body is extended along the y direction and divides the exhaust groove along the x direction, and the second plate body is extended along the x direction and divides the exhaust groove along the y direction.

3. The insulating member according to claim 2, characterized in that: Along the x direction, the length of the sub-groove is A, and along the y direction, the width of the sub-groove is B, satisfying 1 / 2×A≤B≤1.3×A.

4. The insulating member according to any one of claims 1 to 3, characterized in that: Along the x direction, the length of the exhaust groove is E, which satisfies 10 mm ≤ E ≤ 30 mm; and / or, Along the y direction, the width of the exhaust groove is F, which satisfies 20 mm ≤ F ≤ 50 mm; and / or, The thickness of the baffle is D, which satisfies 0.5 mm ≤ D ≤ 1 mm.

5. A battery cover, characterized in that: An insulating member comprising the insulating member according to any one of claims 1 to 4.

6. A battery, characterized in that: Including the battery cover plate as claimed in claim 5.

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