Battery and battery pack

Abstract

The battery comprises a cover plate body, a metal block and a pole, at least two first through holes are arranged on the cover plate body along a first direction, the metal block is arranged on one side of the cover plate body along a second direction, second through holes are arranged on the metal block, the number of the first through holes is consistent with that of the second through holes, and the pole is arranged on the metal block. The first through holes are communicated with the second through holes in the metal block in a one-to-one correspondence mode, the number of the pole columns is consistent with that of the first through holes, the pole columns penetrate into the first through holes and the second through holes in the second direction and are connected with the metal block, the sum of the projection areas of the first through holes projected on the metal block in the second direction is a mm < 2 >, and in at least two pole columns in the first direction, the sum of the projection areas is a mm < 2 >. A first interval is formed between every two adjacent pole columns, the sum of the first intervals is bmm, the size of the metal block in the third direction is cmm, and a / (b * c) is larger than or equal to 0.015 and smaller than or equal to 2.5. According to the utility model, overcurrent inside and outside the battery can be more balanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery and battery pack. BACKGROUND

[0002] The cover plate of the battery is used to be connected with the shell of the battery to isolate the internal structure of the battery from the outside world, and the cover plate of the battery is also used to electrically connect the battery inside the battery cell to deliver the current of the battery cell to the outside.

[0003] In the related art, in order to improve the overcurrent performance of the battery cell, a plurality of poles are generally arranged on the battery cover plate to improve the overcurrent performance of the battery cell, and at the same time, a conductive row needs to be welded on the battery cover plate to be electrically connected with the outside world.

[0004] Since the conductive row has a requirement for flatness when welding, the conductive row is generally welded between the two adjacent poles, and the welding area of the conductive row and the battery cover plate affects the overcurrent performance of the battery cell and the size of the pole also affects the overcurrent performance of the battery cell, so in order to ensure the balance of the overcurrent of the battery cell, the battery cover plate needs to be reasonably designed. SUMMARY

[0005] The primary object of the utility model is to provide a battery to ensure the overcurrent performance of the battery cell.

[0006] Other objects of the utility model are to provide a battery pack using the above-mentioned battery.

[0007] In order to solve the above technical problems, the utility model provides the following technical scheme:

[0008] A battery has a first direction, a second direction and a third direction perpendicular to each other, comprising:

[0009] A cover plate body is arranged with at least two first through holes, and the arrangement direction of the two adjacent first through holes is the first direction;

[0010] A metal block is arranged on one side of the cover plate body in the second direction, the second direction is perpendicular to the plane of the cover plate body, and the metal block is provided with a second through hole, the number of the first through hole and the second through hole is consistent, and the first through hole and the second through hole are in one-to-one correspondence;

[0011] A pole is arranged, the number of the pole and the first through hole is consistent, the pole and the first through hole are in one-to-one correspondence, the pole penetrates into the first through hole and the second through hole along the second direction, and the pole is fixedly connected with the metal block;

[0012] The sum of the projection areas of the first through holes on the metal block in the second direction is a mm 2 In the at least two pole columns in the first direction, each of the first intervals between two adjacent pole columns is b mm, and the size of the metal block in the third direction is c mm, and 0.015≤a / (b*c)≤2.5.

[0013] The utility model still relates to a battery pack, including the electrically conductive row and the battery, at least two batteries are equipped with to the battery, and two adjacent batteries are electrically connected through the electrically conductive row, and the electrically conductive row is welded on the metal block and is located between two adjacent pole columns.

[0014] Compared with the prior art, the utility model embodiment has the beneficial effects that:

[0015] In the utility model, when at least two pole columns are arranged on the cover plate body, considering the requirement of the flatness of the welding surface of the metal block when the electrically conductive row is welded, the electrically conductive row is generally welded on the metal block and located between two adjacent pole columns, since the pole column passes through the first through hole and the second through hole, the sum of the areas of the first through hole on the cover plate body has a certain influence on the welding surface on the metal block, that is, has an influence on the flow performance between the metal block and the electrically conductive row, and moreover, the sum of the areas of the first through hole also has a certain influence on the size of the pole column, that is, has an influence on the flow performance of the battery cell, therefore, in the utility model, 0.015≤a / (b*c)≤2.5 is used to balance the flow performance of the battery cell and the flow performance between the metal block and the electrically conductive row, so that the flow inside and outside the battery is more balanced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the top view of the cover plate body and the metal block of the utility model embodiment;

[0017] Figure 2 It is the sectional view of the cover plate body and the metal block of the utility model embodiment;

[0018] Figure 3 It is the whole structure schematic view of the battery of the utility model embodiment;

[0019] Figure 4 It is Figure 3 The enlarged view in A of Fig.

[0020] In the figure, 1, cover plate body; 11, first through hole; 2, metal block; 21, second through hole; 211, first sub-hole part; 212, second sub-hole part; 3, pole; 31, riveting part; 32, limiting part; 4, shell; 5, battery cell; 51, battery cell body; 52, tab; 6, explosion-proof valve; 7, liquid injection hole; 8, first insulating sealing element; 9, second insulating sealing element. DETAILED DESCRIPTION

[0021] 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.

[0022] In the description of the present application, it should be understood that the phrase "comprising" used in the present application specification means that the features, integers, steps, operations, components and / or assemblies exist, but does not exclude the existence or addition of one or more other features, integers, steps, operations, components, assemblies and / or their combinations. It should be understood that when we say that a component is "connected" to another component, it can be directly connected to the other component, or there can be an intermediate component. The phrase "and / or" used herein includes all or any unit and all combinations of the associated listed items.

[0023] As shown in Figures 1 to 4 The present application relates to a battery, which has a first direction, a second direction and a third direction perpendicular to each other, the first direction is specifically the length direction of the battery cover plate, the second direction is specifically the height direction of the battery cover plate, and the third direction is specifically the width direction of the battery cover plate, and the battery cover plate comprises a cover plate body 1, a metal block 2 and a pole 3.

[0024] At least two first through holes 11 are arranged on the cover plate body 1, and the arrangement direction of the two adjacent first through holes 11 is the first direction.

[0025] The metal block 2 is arranged on one side of the cover plate body 1 in the second direction, the second direction is perpendicular to the plane where the cover plate body 1 is located, and the metal block 2 is provided with a second through hole 21, the number of the first through hole 11 and the second through hole 21 is consistent, and the first through hole 11 and the second through hole 21 are in one-to-one correspondence and in communication, and the hole diameter of the first through hole 11 and the second through hole 21 is the same.

[0026] The number of the pole 3 and the first through hole 11 is consistent, the pole 3 and the first through hole 11 are in one-to-one correspondence, the pole 3 penetrates into the first through hole 11 and the second through hole 21 along the second direction, and the pole 3 is fixedly connected with the metal block 2.

[0027] The sum of the projection areas of the first through holes 11 projected on the metal block 2 along the second direction is a mm 2 Among the at least two pole columns 3 in the first direction, each of the first intervals between two adjacent pole columns 3 is b mm, the size of the metal block 2 along the third direction is c mm, and 0.015≤a / (b*c)≤2.5. The value of a / (b*c) can be 0.08, 0.2, 0.3, 0.8, 1.2, 1.5, 1.8, 2, 2.2, 2.3 or 2.4.

[0028] In the utility model, when at least two pole columns 3 are arranged on the cover plate body 1, considering the requirement of the flatness of the welding surface of the metal block 2 during the welding of the conductive bar, the conductive bar is generally welded on the metal block 2 and between two adjacent pole columns 3. Since the pole column 3 passes through the first through hole 11 and the second through hole 21, the sum of the areas of the first through holes 11 on the cover plate body 1 has a certain influence on the welding surface of the metal block 2, that is, on the flow performance between the metal block 2 and the conductive bar. Moreover, the sum of the areas of the first through holes 11 also has a certain influence on the size of the pole column 3, that is, on the flow performance of the battery cell 5. Therefore, in the utility model, 0.015≤a / (b*c)≤2.5 is set to balance the flow performance of the battery cell 5 and the flow performance between the metal block 2 and the conductive bar, so that the flow inside and outside the battery is more balanced.

[0029] In some embodiments, 19 mm 2 ≤a≤200 mm 2 . The value of a can be 22 mm, 26 mm, 34 mm, 39 mm, 45 mm, 60 mm, 90 mm, 140 mm, 160 mm, 180 mm or 190 mm.

[0030] In some embodiments, 10 mm≤b≤50 mm. The value of b can be 12 mm, 14 mm, 18 mm, 24 mm, 30 mm, 38 mm, 46 mm or 48 mm.

[0031] In some embodiments, 8 mm≤c≤25 mm. The value of c can be 10 mm, 12 mm, 14 mm, 18 mm, 22 mm, 23 mm or 24 mm.

[0032] In some embodiments, 200 mm 2 ≤b*c≤1000 mm 2 . The value of b*c can be 220 mm 2 , 260 mm 2 , 350 mm 2 , 390 mm 2480 mm 2 560 mm 2 640 mm 2 780 mm 2 850 mm 2 900 mm 2 920 mm 2 960 mm 2 or 980 mm 2 .

[0033] In the embodiment, in the first direction, the minimum distance between the pole 3 located at the edge and the edge of the metal block 2 is d mm, wherein 1 mm≤d≤10 mm, 0.015≤a / (b*c)≤1.5. The value of d can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm or 9 mm.

[0034] Specifically, the first direction is also the arrangement direction of the pole 3, in the first direction and among the two poles 3 located at the outermost sides of the two ends, the distance between one of the poles 3 and the side of the metal block 2 adjacent to the pole 3 in the first direction is d, and the distance between the other pole 3 and the side of the metal block 2 adjacent to the pole 3 in the first direction is also d, then, 1 mm≤d≤10 mm is maintained, so that the distance between the outermost pole 3 and the side of the metal block 2 is not too small to prevent the metal block 2 from being deformed when the pole 3 is riveted with the metal block 2, affecting the subsequent welding, and at the same time, the distance between the outermost pole 3 and the side of the metal block 2 is not too large, so as not to cause the distance between the two adjacent poles 3 to be too small, thereby not affecting the welding area of the conductive row.

[0035] In the embodiment, in the first direction, the minimum distance between the two adjacent poles 3 is b1 mm, 3 mm≤b1≤15 mm. The value of b1 can be 4 mm, 5 mm, 7 mm, 9 mm, 11 mm, 13 mm or 14 mm.

[0036] The metal block 2 is riveted to the cover plate body 1 through the pole column 3, so when the distance between two adjacent pole columns 3 is too close, the area between the two adjacent pole columns 3 will be severely compressed, causing the area to deform and affect the sealing effect, and also affecting the stability of the subsequent welding with the conductive row. At the same time, in order to ensure the sealing between the pole column 3 and the metal block 2, the pole column 3 and the metal block 2 need to be welded after the metal block 2 is riveted through the pole column 3, so as to ensure the sealing. If the distance between two adjacent pole columns 3 is too close, the welding heat will be too concentrated during the welding process, affecting the insulation and sealing performance. If the distance between two adjacent pole columns 3 is too far, the size of the metal block 2 in the first direction will be too large or the area where the pole column 3 can be arranged will be reduced, thereby affecting the overcurrent capacity of the battery. Therefore, 3mm≤b1≤15mm is maintained to ensure the sealing performance and overcurrent performance of the battery.

[0037] In the embodiment, the second through hole 21 includes a first sub-hole part 211 and a second sub-hole part 212 which are sequentially arranged and communicated along the second direction, the first sub-hole part 211 is located on the side of the metal block 2 away from the cover plate body 1, the second sub-hole part 212 is located on the side of the metal block 2 facing the cover plate body 1, the aperture of the first sub-hole part 211 is larger than the aperture of the second sub-hole part 212, the aperture of the second sub-hole part 212 is equal to the aperture of the first through hole 11, one end of the pole column 3 in the second direction has a riveting part 31, the pole column 3 passes through the first sub-hole part 211, the second sub-hole part 212 and the first through hole 11, and the riveting part 31 of the pole column 3 is riveted in the first sub-hole part 211, the outer periphery of the riveting part 31 is welded and fixed with the metal block 2, and in at least two first sub-hole parts 211 in the first direction, there is a second interval between two adjacent first sub-hole parts 211, and the sum of each second interval is fmm, where f is the same as b, that is, since the riveting part 31 of the pole column 3 is riveted in the first sub-hole part 211, the size of the first sub-hole part 211 directly affects the welding area on the metal block 2 for the conductive row, therefore, the first interval is the second interval.

[0038] Specifically, the second through hole 21 includes a first sub-hole part 211 and a second sub-hole part 212 which are sequentially arranged and communicated along the second direction, that is, the second through hole 21 is equivalent to a counterbore hole, so that when the pole column 3 is riveted to the metal block 2 to fix the metal block 2 to the cover plate body 1, the riveting part 31 formed after the riveting of the pole column 3 can be located in the first sub-hole part 211, so that the pole column 3 does not protrude outside the metal block 2, so as not to easily affect the subsequent welding of the conductive row.

[0039] In the embodiment, the other end of the pole post 3 in the second direction is provided with a limiting part 32 which is attached to the side of the cover plate body 1 opposite to the metal block 2.

[0040] Specifically, the size of the limiting part 32 is greater than the hole diameter of the first through hole 11 of the cover plate body 1, so that the limiting part 32 can be attached to the side of the cover plate body 1 opposite to the metal block 2, so that the metal block 2 can be stably fixed on the cover plate body 1 through the pole post 3, and the limiting part 32 can also increase the welding area of the pole post 3, so as to facilitate the welding of the pole post 3 and the tab 52.

[0041] The limiting parts 32 of all the pole posts 3 on the cover plate body 1 can be integrally formed, or the limiting parts 32 of all the pole posts 3 on the cover plate body 1 can be independently provided.

[0042] In the embodiment, the first insulating seal 8 is arranged between the first through hole 11 and the pole post 3, and the second insulating seal 9 is arranged between the metal block 2 and the cover plate body 1.

[0043] The first insulating seal 8 and the second insulating seal 9 are arranged to insulate and seal the pole post 3 and the metal block 2 from the cover plate body 1, so as to avoid short circuit and improve the sealing performance of the battery.

[0044] In some embodiments, the battery further comprises a shell 4 and an explosion-proof valve 6, the shell 4 has an opening, the cover plate body 1 is arranged at the opening of the shell 4, and the explosion-proof valve 6 is arranged on the cover plate body 1, wherein 0.015≤a / (b*c)≤2.3.

[0045] When the explosion-proof valve 6 and the pole post 3 are located on the same side of the cover plate body 1, the explosion-proof valve 6 will occupy the position on the cover plate body 1, so the setting area of the pole post 3 will also be reduced, and therefore the size of the first through hole 11 needs to be reduced, otherwise it will affect the structural strength of the cover plate body 1, so the upper limit value of the sum a of the projection areas of the first through hole 11 on the metal block 2 in the second direction is reduced, and in order to ensure that the explosion-proof valve 6 has a position for installation, b cannot be too large, and at the same time, considering the need for heat dissipation, b cannot be too small, so it is necessary to keep 0.015≤a / (b*c)≤2.3.

[0046] Preferably, the battery further comprises a battery cell 5 arranged in the shell 4, the battery cell 5 comprises a battery cell body 51 and a tab 52 connected to the battery cell body 51, the tab 52 is welded with the pole post 3, and the projection face of the tab 52 on the cover plate body 1 in the second direction does not overlap with the projection face of the explosion-proof valve 6 on the cover plate body 1 in the second direction.

[0047] By letting the projection of the tab 52 on the cover plate body 1 in the second direction not overlap the projection of the explosion-proof valve 6 on the cover plate body 1 in the second direction, that is, the tab 52 is not directly below the explosion-proof valve 6, the tab 52 and the explosion-proof valve 6 are staggered, so that the tab 52 can prevent the explosion-proof valve 6 from exploding.

[0048] In some embodiments, the battery further comprises a shell 4 and a liquid injection hole 7, the shell 4 has an opening, the cover plate body 1 is covered at the opening of the shell 4, and the liquid injection hole 7 is arranged on the cover plate body 1, wherein 0.08≤a / (b*c)≤2.3.

[0049] Since the pole 3 and the liquid injection hole 7 are both arranged on the cover plate body 1, the liquid injection hole 7 occupies a position on the cover plate body 1, so the size of the metal block 2 and the first through hole 11 should not be too large. If the metal block 2 is too large, it will affect the use of the liquid injection equipment during the liquid injection process. If the first through hole 11 is too large, it will affect the structural strength of the cover plate body 1, which may cause the cover plate body 1 to deform due to insufficient strength during the liquid injection process. Therefore, it is necessary to maintain 0.08≤a / (b*c)≤2.3.

[0050] Preferably, the battery further comprises a battery cell 5 arranged in the shell 4, the battery cell 5 comprises a battery cell body 51 and a tab 52 connected to the battery cell body 51, the tab 52 is welded with the pole 3, and the projection of the tab 52 on the cover plate body 1 in the second direction partially overlaps or does not overlap the projection of the liquid injection hole 7 on the cover plate body 1 in the second direction.

[0051] When the projection of the tab 52 on the cover plate body 1 in the second direction partially overlaps the projection of the liquid injection hole 7 on the cover plate body 1 in the second direction, the electrolyte injected by the user into the liquid injection hole 7 will not directly flush the battery cell 5. When the projection of the tab 52 on the cover plate body 1 in the second direction does not overlap the projection of the liquid injection hole 7 on the cover plate body 1 in the second direction, the battery cell 5 is less likely to affect the inflow of electrolyte, which can improve the liquid injection efficiency.

[0052] In some embodiments, the battery further comprises a shell 4, an explosion-proof valve 6, and a liquid injection hole 7, the shell 4 has an opening, the cover plate body 1 is covered at the opening of the shell 4, the explosion-proof valve 6 and the liquid injection hole 7 are both arranged on the cover plate body 1, and 0.08≤a / (b*c)≤2.1.

[0053] Since the pole 3, the explosion-proof valve 6 and the liquid injection hole 7 are all arranged on the cover plate body 1, the size of the metal block 2 and the first through hole 11 should not be too large, and if the size of the metal block 2 is too large, the use of the liquid injection equipment will be affected during the liquid injection process, and if the size of the first through hole 11 is too large, the structural strength of the cover plate body 1 will be affected, and the cover plate body 1 will be deformed due to insufficient strength during the liquid injection process, therefore, it is necessary to keep 0.08≤a / (b*c)≤2.1.

[0054] It should be noted that, in order to further explain the value of b, the utility model is illustrated by examples, the pole 3 is provided with four poles, three first intervals are formed between the four poles 3, and the values of each first interval in the first direction are b1mm, b2mm and b3mm, wherein b=b1+b2+b3.

[0055] The utility model also relates to a battery pack, which comprises a conductive bar and the battery, the battery is provided with at least two, and the adjacent two batteries are electrically connected through the conductive bar, the conductive bar is welded on the metal block 2 and located between the adjacent two poles 3, so as to complete the electrical connection between the batteries.

[0056] The above-mentioned is only the preferred embodiment of the utility model, and it should be pointed out that, for the ordinary skilled in the technical field, several improvements and replacements can be made without departing from the technical principles of the utility model, and these improvements and replacements should also be regarded as the protection range of the utility model.

Claims

1. A battery having a first direction, a second direction, and a third direction each perpendicular to the other two, characterized by, The cover plate body is provided with at least two first through holes arranged thereon, and the arrangement direction of two adjacent first through holes is a first direction. A metal block is arranged on one side of the cover plate body in a second direction, the second direction is a direction perpendicular to the plane of the cover plate body, and the metal block is provided with a second through hole, the number of the first through hole and the second through hole is consistent, and the first through hole and the second through hole correspond to each other. The number of the pole column and the first through hole is consistent, the pole column corresponds to the first through hole one by one, the pole column penetrates into the first through hole and the second through hole along the second direction, and the pole column is fixedly connected with the metal block. 10mm≤b≤50mm. The sum of the projection areas of the first through holes on the metal block in the second direction is amm 2 In the at least two pole columns in the first direction, two adjacent pole columns have a first interval, and the sum of each first interval is bmm. The dimension of the metal block in the third direction is cmm, and 0.015≤a / (b*c)≤2.

5.

2. The battery of claim 1, wherein, 19 mm 2 ≤ a ≤ 200 mm 2 .

3. The battery of claim 1, wherein, 8mm≤c≤25mm.

4. The battery of claim 1, wherein, In the first direction, the minimum distance between the pole column located at the edge and the edge of the metal block is d mm, wherein 1mm≤d≤10mm, 0.015≤a / (b*c)≤1.

5.

5. The battery of claim 1, wherein, 200 mm 2 ≤ b * c ≤ 1000 mm 2 .

6. The battery of claim 1, wherein, In the first direction, the minimum distance between two adjacent pole columns is b1 mm, 3mm≤b1≤15mm.

7. The battery of claim 1, wherein, The second through hole includes a first sub-hole part and a second sub-hole part which are sequentially arranged and communicated together along the second direction, the first sub-hole part is located on the side of the metal block away from the cover plate body, the second sub-hole part is located on the side of the metal block facing the cover plate body, the aperture of the first sub-hole part is larger than that of the second sub-hole part, the aperture of the second sub-hole part is equal to that of the first through hole, one end of the pole column in the second direction has a riveting part, the pole column penetrates through the first sub-hole part, the second sub-hole part and the first through hole, and the riveting part of the pole column is riveted in the first sub-hole part, in the first direction, at least two first sub-hole parts, and the sum of each second interval is f mm, wherein f is the same as b.

8. The battery of claim 1, wherein, The other end of the pole column in the second direction has a limiting part which is attached to the side of the cover plate body away from the metal block.

9. The battery of claim 8, wherein, Further comprising a shell and an explosion-proof valve, the shell has an opening, the cover plate body is arranged on the opening of the shell, and the explosion-proof valve is arranged on the cover plate body, wherein 0.015≤a / (b*c)≤2.

3.

10. The battery of claim 1, wherein, Further comprising an electric core arranged in the shell, the electric core comprises an electric core body and a tab connected with the electric core body, the tab is welded with the pole column, and the projection of the tab on the cover plate body in the second direction does not overlap with the projection of the explosion-proof valve on the cover plate body in the second direction.

11. The battery of claim 10, wherein, Further comprising a shell and a liquid injection hole, the shell has an opening, the cover plate body is arranged on the opening of the shell, and the liquid injection hole is arranged on the cover plate body, wherein 0.08≤a / (b*c)≤2.

3.

12. The battery of claim 1, wherein, ​ 13. The battery of claim 12, wherein, The battery further comprises an electric core arranged in the shell, the electric core comprising an electric core body and a tab connected with the electric core body, the tab is welded with the pole column, and a projection face of the tab projected on the cover plate body in the second direction partially overlaps or does not overlap with a projection face of the liquid injection hole projected on the cover plate body in the second direction.

14. The battery of claim 1, wherein, The battery further comprises a shell, an explosion-proof valve and a liquid injection hole, the shell has an opening, the cover plate body is arranged at the opening of the shell, and the explosion-proof valve and the liquid injection hole are arranged on the cover plate body, wherein 0.08≤a / (b*c)≤2.

1.

15. A battery pack, characterized by The battery further comprises a conductive row and the battery of any one of claims 1-14, the battery is provided with at least two, and adjacent two batteries are electrically connected through the conductive row, the conductive row is welded on the metal block and located between adjacent two pole columns.

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