Batteries, battery packs and electrical equipment

Abstract

The present invention discloses a battery, a battery pack, and an electrical device, wherein the battery includes a housing, an adapter plate, and a battery cell. The housing is provided with a pole. The adapter plate is disposed within the housing and electrically connected to the pole. The battery cell is disposed within the housing. The battery cell includes a battery cell body and a tab. The tab extends from the battery cell body. The end of the tab away from the battery cell body is bent along a first direction of the housing and then connected to a side of the adapter plate facing away from the battery cell. A bent portion is formed at the bent portion of the tab. The distance between the two inner side walls of the housing in the first direction is D mm. The dimension of the adapter plate in the first direction of the housing is d mm. The thickness of the tab is Y mm, and 3 ≤ (D-d) / Y ≤ 150. The present invention can prevent the tab from rubbing against the housing, prevent the battery from short-circuiting, and ensure excellent battery overcurrent performance.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery, a battery pack and an electrical device. Background Art

[0002] At present, lithium-ion batteries include a shell, a cover, a battery cell and an adapter. The cover is arranged on the shell, and a pole is provided on the cover. The adapter and the battery cell are both located in the shell, and the adapter is connected to the pole. A pole ear is provided on one side of the battery cell, and the pole ear is electrically connected to the surface of the adapter after being bent.

[0003] However, the tabs protrude outward at the bent portion, so when the battery cell is placed in the shell, the bent portion of the tabs is prone to rubbing against the shell, which can easily cause a short circuit in the battery and the tabs are easily scratched. Summary of the Invention

[0004] The primary purpose of the present invention is to provide a battery to prevent the tabs from being scratched against the housing and to prevent the battery from being short-circuited.

[0005] Another object of the present invention is to provide a battery pack using the above-mentioned battery.

[0006] Another object of the present invention is to provide an electrical device using the above-mentioned battery pack.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

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

[0009] a housing, wherein a pole is provided on the housing;

[0010] A switching piece, which is arranged in the housing and electrically connected to the pole;

[0011] A battery cell is disposed in the housing, the battery cell comprising a battery cell body and a tab, the tab extending from the battery cell body, an end of the tab away from the battery cell body being bent along a first direction of the housing and then connected to a side of the adapter facing away from the battery cell, and the bent portion of the tab forming a bent portion;

[0012] The distance between the two inner side walls of the shell in the first direction is D mm, the dimension of the adapter in the first direction of the shell is d mm, the thickness of the tab is Y mm, and 3≤(Dd) / Y≤150.

[0013] The present invention also relates to a battery pack comprising the battery.

[0014] The present invention also relates to an electrical device comprising the battery pack.

[0015] Compared with the prior art, the battery according to the embodiment of the present invention has the following advantages:

[0016] In the present invention, when the tab is connected to the adapter, the tab needs to be bent along the first direction of the shell and then welded to the adapter. At this time, the tab protrudes at the bending position to form the bent portion. Taking into account the distance D between the two inner side walls of the shell in the first direction, the dimension d of the adapter in the first direction of the shell, and the thickness Y of the tab, 3≤(Dd) / Y≤150 is maintained. This can prevent the tab from rubbing against the shell when the battery cell is placed in the shell, causing a battery short circuit. At the same time, it also avoids insufficient battery overcurrent capacity, increased battery heat generation, and increased temperature rise. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the overall structure of an embodiment of the present invention;

[0018] Figure 2 It is an exploded view of the overall structure of an embodiment of the present invention;

[0019] Figure 3 is a schematic diagram of a battery cell and an adapter sheet according to an embodiment of the present invention;

[0020] Figure 4 yes Figure 3 A magnified view of point A in the figure;

[0021] Figure 5 1. It is a schematic diagram of a tab of one embodiment of the present invention;

[0022] Figure 6 is a schematic diagram of a tab according to another embodiment of the present invention;

[0023] Figure 7 Schematic diagram of the tab of another embodiment of the present invention;

[0024] Figure 8 Schematic diagram of the tab and adapter according to an embodiment of the present invention.

[0025] In the figure,

[0026] 1. Shell; 11. Pole; 12. Shell; 13. Cover; 14. Arc-shaped portion;

[0027] 2. Adapter; 21. First connecting portion; 22. Second connecting portion;

[0028] 3. Battery cell; 31. Battery cell body; 32. Tab; 321. Bend portion; 322. First welding area; 323. Second welding area; 324. Sub-tab; 325. Retracted portion;

[0029] 4. Insulation layer. DETAILED DESCRIPTION

[0030] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0031] In the description of the present invention, it should be understood that the term "comprising" as used in the present specification refers to the presence of the stated features, integers, steps, operations, parts / components, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, parts / components, components, and / or groups thereof. It should be understood that when we refer to a part / component as being "connected" to another part / component, it can be directly connected to the other part / component, or there can be intermediate parts / components. The term "and / or" as used herein includes all or any one of the associated listed items and all combinations thereof.

[0032] like Figures 1 to 8 As shown, the present invention relates to a battery having a first direction, a second direction and a third direction that intersect each other perpendicularly, comprising a shell 1, a transfer plate 2 and a battery cell 3, wherein the shell 1 is provided with a pole 11, the transfer plate 2 is arranged in the shell 1 and electrically connected to the pole 11, the battery cell 3 is arranged in the shell 1, the battery cell 3 comprises a battery cell body 31 and a tab 32, the tab 32 extending from the battery cell body 31, the end of the tab 32 away from the battery cell body 31 is bent along the first direction of the shell 1 and then connected to the side of the transfer plate 2 facing away from the battery cell 3, and a bending portion 321 is formed at the bending place of the tab 32, and the first direction, the second direction and the third direction can be the width direction, length direction and height direction of the shell 1 respectively.

[0033] The distance between the two inner sidewalls of the housing 1 in the first direction is D mm, the dimension of the adapter plate 2 in the first direction of the housing 1 is d mm, the thickness of the tab 32 is Y mm, and 3 ≤ (Dd) / Y ≤ 150. The value of (Dd) / Y can be 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, or 140.

[0034] In the present invention, when the tab 32 is connected to the adapter 2, the tab 32 needs to be bent along the first direction of the shell 1 and then welded to the adapter 2. At this time, the tab 32 protrudes at the bending position and forms the bent portion 321. By comprehensively considering the distance D between the two inner side walls of the shell 1 in the width direction, the dimension d of the adapter 2 in the width direction of the shell 1, and the thickness Y of the tab 32, maintaining 3≤(Dd) / Y≤150, it can avoid the tab 32 and the shell 1 from being scratched when the battery cell 3 is put into the shell, causing a battery short circuit, and also avoid insufficient battery overcurrent capacity, increased battery heat generation, and increased temperature rise.

[0035] It should be explained that the shell 1, specifically, the shell 1 is arranged on the outermost side of the battery cell 3, and is used to protect the battery cell 3; the material of the shell 1 can be selected from but not limited to aluminum alloy, steel, etc.; specifically, it can be aluminum-manganese alloy, aluminum-magnesium alloy, stainless steel, nickel-plated steel, etc.

[0036] The adapter plate 2 is used to realize current transmission and electrically connect the tab 32 and the pole 11 . The material of the adapter plate 2 can be aluminum, copper, etc.

[0037] The pole 11 is used as the battery current output terminal, and is used to connect to an external busbar, etc., to achieve series and parallel connection between batteries; the pole 11 can include a positive pole and a negative pole; the material of the pole 11 can be aluminum, copper, copper-aluminum composite, etc.

[0038] The tab 32 serves as the current output terminal inside the battery cell 3 and is used to electrically connect to the electrode 11 and the like. The tab 32 can be cut from the current collector or a separately formed metal part. It is understood that the positive tab is electrically connected to the positive electrode sheet in the battery cell 3, and the negative tab is electrically connected to the negative electrode sheet in the battery cell 3.

[0039] The battery cell 3 comprises a positive electrode sheet, a negative electrode sheet, and a separator. The separator is positioned between the positive and negative electrode sheets, and the positive, negative, and separator sheets are stacked to form the battery cell. The positive electrode sheet comprises a positive current collector and a positive active material layer, while the negative electrode sheet comprises a negative current collector and a negative active material layer. The positive current collector is not particularly limited, as long as it is conductive and does not cause adverse chemical changes in the battery. Materials such as stainless steel, aluminum, nickel, titanium, calcined carbon, or aluminum or stainless steel surface-treated with carbon, nickel, titanium, or silver can be used. The negative current collector can be made of copper, stainless steel, nickel, titanium, or the like. In specific embodiments, aluminum can be used for the positive electrode, and copper can be used for the negative electrode. The positive active material layer comprises a positive electrode active material, such as a nickel-cobalt-manganese ternary material, lithium iron phosphate, or lithium iron manganese phosphate. The negative active material layer comprises a negative electrode active material, such as artificial graphite, natural graphite, or a silicon-based material.

[0040] In some embodiments, 5≤(Dd) / Y≤125.

[0041] That is, by further controlling (Dd) / Y within the range of 5-125, the tab 32 is further prevented from rubbing against the housing 1, thereby reducing the risk of battery short circuit. In addition, the battery's overcurrent capacity is also improved.

[0042] In some embodiments, 5 mm ≤ Dd ≤ 30 mm and / or 0.05 mm ≤ Y ≤ 2.5 mm. Preferably, 8 mm ≤ Dd ≤ 25 mm. Dd can be 9 mm, 12 mm, 15 mm, 20 mm, 23 mm, 25 mm, 28 mm, or 29 mm. Y can be 0.1 mm, 0.15 mm, 0.25 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, or 2.25 mm.

[0043] That is, by controlling Dd within the range of 5-30 mm, the tab 32 and the shell 1 can be prevented from overlapping, which would cause a short circuit in the battery. Dd cannot be too small, otherwise the risk of scratching between the bent portion 321 of the tab 32 and the shell 1 will increase, and the risk of a short circuit in the battery will be high. Dd cannot be too large, otherwise the space utilization inside the shell 1 will be low.

[0044] Furthermore, 10mm≤D≤75mm, 5mm≤d≤68mm. The value of D can be 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, or 70mm. The value of d can be 7mm, 10mm, 13mm, 15mm, 18mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 52mm, 55mm, 60mm, 63mm, 65mm, or 67mm.

[0045] In some embodiments, the overlapping dimension of the tab 32 and the adapter 2 in the width direction of the housing 1 is L1 mm, wherein L1 ≥ d / 2, 8 ≤ (Dd) / Y ≤ 100.

[0046] The dimension L1 of the contact between the tab 32 and the adapter 2 in the width direction of the shell 1 has an impact on the overcurrent capacity of the battery, so the battery overcurrent performance is better when L1 ≥ d / 2. By controlling 8 ≤ (Dd) / Y ≤ 100, the risk of short circuit between the tab 32 and the shell 1 can be further reduced. At the same time, insufficient overcurrent capacity of the battery is avoided. In addition, the space utilization rate within the shell 1 can be improved.

[0047] In some embodiments, the overlapping dimension of the tab 32 and the adapter 2 in the width direction of the housing 1 is L1 mm, wherein d / 4≤L1<d / 2, 8≤(Dd) / Y≤80.

[0048] When the overlapping size of the tab 32 and the adapter 2 is small, the battery's current capacity is limited. By controlling 8≤(Dd) / Y≤80, the thickness of the tab 32 can be prevented from being too small, which would affect the battery's current capacity. At the same time, by controlling the size of Dd, the thickness of the tab 32 can be prevented from being too large, which would cause scratches between the tab 32 and the shell 1, thereby reducing the risk of battery short circuit.

[0049] In some embodiments, the battery cell 3 has one tab 32 , and the overlap between the tab 32 and the adapter 2 in the width direction of the housing 1 is L1 mm, where 0.4 ≤ L1 / d ≤ 0.9, and 8 ≤ (Dd) / Y ≤ 125. L1 can be 6 mm, 10 mm, 15 mm, 18 mm, 20 mm, 22 mm, or 24 mm. L1 / d can be 0.5, 0.6, 0.7, or 0.8.

[0050] When only one battery cell 3 is provided in the housing 1 , further controlling (Dd) / Y within the range of 8-125 can take into account both the battery overcurrent capacity and the avoidance of battery short circuit.

[0051] In some embodiments, at least two battery cells 3 are provided along the width direction of the housing 1 , and the overlapping dimension of the tab 32 of a single battery cell 3 and the adapter 2 in the width direction of the housing 1 is L1 mm, wherein 0.2≤L1 / d≤0.45, 25≤(Dd) / Y≤125.

[0052] When two or more battery cells 3 are provided in the housing 1 , by controlling 0.2≤L1 / d≤0.45 and 25≤(Dd) / Y≤125, both the battery overcurrent capacity and the avoidance of battery short circuit can be taken into consideration.

[0053] In some embodiments, the housing 1 includes a shell 12 and a cover plate 13. At least one side of the shell 12 has an opening in the height direction of the shell 1. The cover plate 13 covers the opening, and the pole 11 is disposed on the cover plate 13. The cover plate 13 serves to seal the opening of the shell 12. The material of the cover plate 13 can be the same as or different from that of the shell 12. The material of the cover plate 13 can be aluminum alloy, stainless steel, nickel-plated steel, etc.

[0054] The adapter plate 2 and the battery cell body 31 are opposite to and spaced apart from each other on the side surface in the length direction of the shell 1. The tab 32 extends from the side surface in the length direction of the shell 1 and is connected to the adapter plate 2. In the height direction of the shell 1, the distance between the end of the tab 32 close to the cover plate 13 and the cover plate 13 is h1mm, and the distance between the end of the adapter plate 2 close to the cover plate 13 and the cover plate 13 is h2mm, wherein h2

[0055] That is, the end of the adapter plate 2 close to the cover plate 13 protrudes beyond the end of the pole ear 32 close to the cover plate 13, so that after the pole ear 32 is welded to the adapter plate 2, the size of the pole ear 32 that can be electrically connected to the adapter plate 2 becomes smaller, avoiding further impact on the overcurrent capacity of the pole ear 32.

[0056] In some embodiments, 1 mm ≤ h1 - h2 ≤ 8 mm is maintained, and the value of h1 - h2 can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, or 7 mm.

[0057] Specifically, the difference between h1 and h2 cannot be too small, otherwise the edge of the tab 32 close to the cover plate 13 will be too close to the edge of the adapter plate 2 close to the cover plate 13. When the tab 32 is welded, the heat generated by welding will easily affect other components of the battery, such as the insulating part between the cover plate 13 and the battery cell 3; the difference between h1 and h2 cannot be too large, otherwise the weldable size of the tab 32 and the adapter plate 2 will be reduced.

[0058] In some embodiments, the tab 32 extends from a side surface of the cell body 31 in the length direction of the housing 1 , the tab 32 has a dimension a mm in the height direction of the housing 1 , and the cell body 31 has a dimension b mm in the height direction of the housing 1 , wherein 0.7 ≤ a / b ≤ 1. The value of a / b can be 0.75, 0.8, 0.85, 0.9, or 0.95.

[0059] a / b is the ratio of the size of the tab 32 in the height direction of the housing 1 to the size of the cell body 31 in the height direction of the housing 1 . Therefore, maintaining 0.7≤a / b≤1 can enable the battery to have better current capacity.

[0060] ​In some embodiments, the adapter plate 2 and the battery cell body 31 are opposite and spaced apart from each other on the side surface in the longitudinal direction of the housing 1. The tab 32 extends from the side surface in the longitudinal direction of the housing 1 and is connected to the adapter plate 2. The tab 32 has a dimension a in the height direction of the housing 1, and the adapter plate 2 has a dimension c in the height direction of the housing 1. 0.15 ≤ c / a ≤ 0.75, and 0.1 mm ≤ Y ≤ 2 mm. The value of c / a can be 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, or 0.7.

[0061] In other words, the dimension of the adapter plate 2 in the height direction of the housing 1 is made smaller than the dimension of the tab 32 in the height direction of the housing 1, thereby reducing the size of the adapter plate 2 and reducing the weight of the battery. This also prevents the ratio of the adapter plate 2 to the tab 32 from being too small, which would result in insufficient welding area between the tab 32 and the adapter plate 2, leading to poor battery current capacity. Furthermore, by further controlling 0.1mm≤Y≤2mm, the battery current capacity is further improved, while also preventing scratches between the tab 32 and the housing 12, which could cause a short circuit in the battery.

[0062] In some embodiments, the adapter plate 2 and the side surface of the battery cell body 31 in the length direction of the shell 1 are opposite and spaced apart, and the tab 32 extends from the side surface of the battery cell body 31 in the length direction of the shell 1, and the tab 32 is spaced apart along the height direction of the shell with a first welding area 322 and a second welding area 323. The tab 32 is welded to the adapter plate 2 in the first welding area 322, and the area of ​​the first welding area 322 is larger than the area of ​​the second welding area 323, wherein 0.05mm≤Y≤2.5mm.

[0063] Specifically, the tab 32 includes a plurality of stacked sub-tabs 324, and a first welding area 322 and a second welding area 323 are spaced apart on the tab 32 along the height direction of the shell 1, so as to prevent the plurality of sub-tabs 324 from being scattered; at the same time, since the first welding area 322 of the tab 32 needs to be welded with the adapter 2, the area of ​​the first welding area 322 is made larger than the area of ​​the second welding area 323, so as to ensure that the first welding area 322 has sufficient area to be welded with the adapter 2, which can facilitate the welding of the tab 32 and the adapter 2, and can ensure the contact area of ​​the tab 32 and the adapter 2, thereby improving the overcurrent capacity of the battery. In addition, 0.05mm≤Y≤2.5mm is controlled to further reduce the risk of scratching the tab 32 and the shell 1, and reduce the risk of battery short circuit.

[0064] Furthermore, the first welding region 322 is formed by laser welding, and the second welding region 323 is formed by ultrasonic welding.

[0065] Combine Figure 5 As shown, in some embodiments, the tab 32 includes a plurality of sub-tabs 324, which are folded together and bent along the width direction of the shell 1 and then connected to the adapter 2. The tab 32 is formed with a folding portion 325 at the position where the plurality of sub-tabs 324 are folded together. The folding portion 325 corresponds to one side of the battery cell body 31 in the width direction of the shell 1 and close to the inner side surface of the shell 1. Specifically, the minimum distance between the folding portion 325 and the outer edge of the battery cell body 31 is between 0-3 mm, wherein 20≤(Dd) / Y≤140.

[0066] Since the gathered portion 325 of the tab 32 is close to the inner side surface of the shell 1 , by further controlling 20≤(Dd) / Y≤140, the risk of overlapping between the bent portion 321 of the tab 32 and the shell 1 and causing a short circuit when the gathered portion 325 is arranged at the outer edge of the battery cell body 31 is further reduced.

[0067] Combine Figure 6 As shown, in some embodiments, the tab 32 includes a plurality of sub-tabs 324, which are folded together, bent along the width direction of the shell 1, and then connected to the adapter 2. The tab 32 forms a folded portion 325 at the position where the plurality of sub-tabs 324 are folded together. The folded portion 325 corresponds to the middle area of ​​the battery cell body 31 in the width direction of the shell 1. Specifically, the distance between the folded portion 325 and the center line of a single battery cell body 31 is between 0-5 mm, wherein 10≤(Dd) / Y≤130.

[0068] Since the retracted portion 325 of the tab 32 corresponds to the middle area of ​​the cell body 31 in the width direction of the shell 1, after the multiple sub-tabs 324 are retracted, the bent portion 321 of the tab 32 is far away from the inner wall of the shell 1. By controlling 10≤(Dd) / Y≤130, the battery's current capacity can be further improved. At the same time, the distance between the adapter 2 and the shell 1 can be controlled to improve the space utilization inside the shell 1.

[0069] Combine Figure 7As shown, in some embodiments, the tab 32 includes a plurality of sub-tabs 324, which are folded together, bent along the width direction of the shell 1, and then connected to the adapter 2. The tab 32 is formed with a folding portion 325 at the position where the plurality of sub-tabs 324 are folded together. The folding portion 325 corresponds to a side of the cell body 31 in the width direction of the shell 1 and away from the inner side surface of the shell 1. Specifically, the distance between the folding portion 325 and the inner edge of the cell body 31 is between 0-3 mm, wherein 8≤(Dd) / Y≤120.

[0070] Since the folded portion 325 of the tab 32 corresponds to the side of the cell body 31 in the width direction of the shell 1 and away from the inner side surface of the shell 1, after the multiple sub-tabs 324 are folded, the bent portion 321 of the tab 32 is far away from the inner wall of the shell 1, which controls the distance between the adapter 2 and the shell 1 and improves the space utilization inside the shell 1.

[0071] In some embodiments, an arcuate portion 14 is formed between the inner sidewall of the housing 1 in the length direction and the inner sidewall of the housing 1 in the width direction, and the bent portion 321 of the tab 32 is opposite to and spaced from the arcuate portion 14 , wherein 10≤(Dd) / Y≤150.

[0072] Since an arcuate portion 14 is formed between the inner side wall of the shell 1 in the length direction and the inner side wall of the shell 1 in the width direction, and the bent portion 321 of the tab 32 is opposite to and spaced from the arcuate portion 14, the bent portion 321 of the tab 32 is likely to come into contact with the arcuate portion 14 of the shell 1. By further controlling 10≤(Dd) / Y≤150, the collision between the bent portion 321 and the arcuate portion 14 can be further avoided, thereby preventing the arcuate portion 14 from exerting pressure on the tab 32, causing damage to the tab 32, and preventing a short circuit in the battery.

[0073] Preferably, the size of the arc portion 14 is R, wherein R≥0.5 mm, 15≤(Dd) / Y≤135. The value of R can be 0.6 mm, 0.7 mm, 0.8 mm or 0.9 mm.

[0074] Since the larger the size of the arc-shaped portion 14 is, the greater the risk of the tab 32 contacting the housing 1 is, when R ≥ 0.5 mm, it is necessary to maintain 15 ≤ (Dd) / Y ≤ 135 to further reduce the risk of contact between the tab 32 and the housing 1 and reduce the risk of battery short circuit.

[0075] In some embodiments, the battery cell 3 is a laminated battery cell, and the tab 32 extends from a side surface of the battery cell body 31 in the length direction of the housing 1 , wherein 10 mm ≤ Dd ≤ 25 mm, and 0.05 mm ≤ Y ≤ 2 mm.

[0076] The laminated battery cell includes a positive electrode sheet, a negative electrode sheet, and a separator. Adjacent positive electrode sheets and adjacent negative electrode sheets are discontinuously arranged with each other, while the separator can be arranged continuously. For example, in a Z-shaped laminated battery cell, the separator can also be arranged discontinuously. The stacking of the positive electrode sheets, negative electrode sheets, and separator of the laminated battery cell is relatively loose. After the tab 32 is extended from the battery cell body 31, the stacking of the multiple layers of sub-tabs 324 is also relatively loose. Therefore, after the tab 32 is subsequently bent, the risk of contact between the tab 32 and the outer shell 1 is also increased. By further controlling 10mm≤Dd≤25mm and 0.05mm≤Y≤2mm, the tab 32 and the outer shell 1 are prevented from contacting and causing a battery short circuit. At the same time, the battery's overcurrent capacity is taken into account.

[0077] In some embodiments, the battery cell 3 is a wound battery cell, wherein 8 mm ≤ Dd ≤ 20 mm, and 0.08 mm ≤ Y ≤ 2.4 mm.

[0078] The wound battery cell is formed by winding the positive electrode sheet, the negative electrode sheet and the separator. The adjacent positive electrode sheets, the adjacent negative electrode sheets and the adjacent separators are continuously arranged. The positive electrode sheets, the negative electrode sheets and the separators are stacked relatively compactly, and the multi-layer sub-electrode ears 324 are also stacked relatively compactly. After the ear 32 is bent, the risk of the ear 32 contacting the outer shell 1 is low. By further controlling 8mm≤Dd≤20mm, 0.08mm≤Y≤2.4mm, the battery's current capacity can be improved, and the space utilization rate inside the outer shell 1 can be improved.

[0079] In some embodiments, the side of the housing 1 where the pole 11 is provided is not opposite to the side of the cell body 31 where the pole tab 32 is provided.

[0080] That is, the tab 32 and the pole 11 can be located on different surfaces of the battery. Specifically, the tab 32 can extend from the side of the battery body 31 in the length direction of the shell 1, and the pole 11 can be located at the top of the shell 1.

[0081] Preferably, the adapter plate 2 is L-shaped, and the adapter plate 2 includes a first connecting portion 21 and a second connecting portion 22, and there is an angle between the first connecting portion 21 and the second connecting portion 22, and the angle range is 80°-110°. The first connecting portion 21 is connected to the pole ear 32, and the second connecting portion 22 is electrically connected to the pole 11.

[0082] Specifically, the first connecting portion 21 is opposite to the side surface of the battery cell body 31 in the length direction of the shell 1, so that the pole ear 32 extending from the side surface of the battery cell body 31 in the length direction of the shell 1 is connected to the first connecting portion 21, and the second connecting portion 22 is located between the battery cell body 31 and the cover plate 13, so that the second connecting portion 22 is connected to the pole 11.

[0083] In some embodiments, the side of the housing 1 where the pole 11 is provided is arranged opposite to the side of the cell body 31 where the pole ear 32 is provided.

[0084] That is, the terminal lug 32 and the terminal post 11 are located on the same side of the battery.

[0085] In some embodiments, the tab 32 includes a plurality of sub-tabs 324 , each of which has a thickness y, wherein 0.002 mm ≤ y ≤ 0.015 mm. The value of y may also be 0.005 mm, 0.008 mm, 0.01 mm, 0.012 mm, 0.013 mm, or 0.014 mm.

[0086] Since the thickness of y affects the thickness of the tab 32, it has an impact on the overcurrent capacity of the battery and also affects the risk of contact between the tab 32 and the shell 1. By controlling 0.002mm≤y≤0.015mm, the overcurrent can be further improved, while avoiding scratches between the tab and the shell, causing a short circuit in the battery, and thus increasing the battery temperature rise.

[0087] In some embodiments, an insulating layer 4 is provided on the side of the tab 32 close to the inner wall of the housing 1 , wherein 30 μm≤d≤60 μm.

[0088] By providing the insulating layer 4 , the tab 32 can be protected, reducing the risk of the tab 32 rubbing against the inner side of the housing 1 . Further controlling 30 μm ≤ d ≤ 60 μm can further improve the protection of the tab 32 .

[0089] The insulating layer 4 may be an insulating film, and the insulating film may be made of PP, PET or PI. The present invention also relates to a battery pack, comprising the battery.

[0090] The battery pack adopts the battery, so that the operation of the battery pack is more stable.

[0091] The present invention also relates to an electrical device comprising the battery pack.

[0092] The electric device adopts the battery pack, so that the operation of the electric device is more stable.

[0093] It should be noted that the preparation process of the battery is as follows (the following selection of the positive electrode active material, negative electrode active material, conductive agent and binder is only for example and does not constitute a limitation on the scope of protection of this application):

[0094] (1) Preparation of positive electrode.

[0095] The prepared positive electrode active material (such as nickel-cobalt-manganese ternary, lithium iron phosphate, lithium manganese iron phosphate), conductive agent acetylene black, and binder PVDF are mixed in a mass ratio of 96:2:2, and solvent NMP is added. The mixture is stirred under the action of a vacuum mixer until the system becomes uniform to obtain a positive electrode slurry; the positive electrode slurry is evenly coated on both surfaces of the positive electrode current collector aluminum foil, dried at room temperature, and then transferred to an oven for further drying, and then cold pressed and cut to obtain a positive electrode sheet.

[0096] (2) Preparation of negative electrode sheet.

[0097] The negative electrode active material graphite or a mixture of graphite and other active materials (such as silicon-based materials) in different mass ratios, the conductive agent acetylene black, the thickener CMC, and the binder SBR are mixed in a mass ratio of 96.4:1:1.2:1.4, and deionized water is added as a solvent. The mixture is stirred under the action of a vacuum mixer until the system becomes uniform to obtain a negative electrode slurry; the negative electrode slurry is evenly coated on both surfaces of the negative electrode current collector copper foil, dried at room temperature, and then transferred to an oven for further drying, and then cold pressed and cut to obtain a negative electrode sheet.

[0098] (3) Preparation of electrolyte.

[0099] Ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) are mixed in a volume ratio of 1:1:1 to obtain an organic solvent. Then, fully dried lithium salt LiPF6 is dissolved in the mixed organic solvent to prepare an electrolyte with a concentration of 1 mol / L.

[0100] (4) Preparation of diaphragm.

[0101] A polyethylene film was selected as the separator.

[0102] (5) Preparation of lithium-ion batteries.

[0103] The positive electrode sheet, separator, and negative electrode sheet are prepared in sequence through a lamination process, so that the separator is placed between the positive and negative electrode sheets to play an isolating role. After the battery cell 3 is prepared, the battery cell 3 is placed in a shell, and the battery cover 13 is welded. The battery is then subjected to processes such as liquid injection, formation, and constant capacity.

[0104] In the present application, the distance between the two side walls of the shell 12 can be controlled by the wall thickness of the shell 12, etc.; the width of the adapter 2 is adjusted by the selection of the adapter 2; the thickness of the tab 32 is controlled by the thickness of the single sub-tab 324, or the number of layers of the sub-tab 324.

[0105] In the specific embodiment of the present application, lithium iron phosphate is selected as the positive electrode, and artificial graphite is selected as the negative electrode active material for example.

[0106] The temperature test method of the battery cell 3 includes: placing the battery cell 3 into the shell 12, sealing and welding the cover plate 13 and the shell 12, and providing the pole 11 on the cover plate 13, and performing a temperature rise test on the battery. The specific test steps are as follows, wherein:

[0107] 1) For lithium iron phosphate batteries: charge at a constant current rate of 4C to 3.65V, and charge at a constant voltage until the current drops to 0.05C; a temperature sensor is connected to the pole 11. During the charging process, the temperature of the pole 11 is sampled to obtain the maximum temperature T of the pole area. When the maximum temperature T of the pole area is ≤45℃, it is good; when 45℃<T≤65℃, it is qualified; when T>65℃, it is unqualified.

[0108] Insert the following table: Examples 1-10 and Comparative Examples 1 and 2 show that when the formula range satisfies: 3≤(Dd) / Y≤150, the battery tab fracture rate is less than or equal to 20%; and the battery pole temperature rise is less than or equal to 65°C, the battery pole temperature rise is qualified;

[0109] Further, in combination with Examples 1-5, it can be seen that when the formula range meets the preferred range of 5-125; and the parameters meet the preferred range, when the battery cell is put into the shell, the tabs do not break; and the battery pole temperature rise is less than or equal to 45°C, and the battery pole temperature rise is good; Example 6 shows that when the parameters are not in the preferred range, but the formula is in the preferred range, the tabs are slightly broken, and the breakage rate is 1.5%; in Example 7, the tab thickness is relatively thin, and the battery temperature rise is qualified; in Example 8, when the parameters are in the preferred range, but the formula is not in the preferred range, the tabs are broken, and the breakage rate is 5.5%; in Example 9, the battery temperature rise is large; in Example 10, the tabs are broken, and the breakage rate reaches 20%; in Comparative Example 1, the battery pole temperature rise is greater than 65°C, and the battery temperature rise is unqualified; in Comparative Example 2, the tabs are seriously broken when the battery cell is put into the shell; the battery temperature rise is unqualified.

[0110]

[0111] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A battery having a first direction, a second direction, and a third direction perpendicular to each other, characterized in that: include: a housing, wherein a pole is provided on the housing; A switching piece, which is arranged in the housing and electrically connected to the pole; A battery cell is disposed in the housing, the battery cell comprising a battery cell body and a tab, the tab extending from a side of the battery cell body in the second direction of the housing, an end of the tab away from the battery cell body being bent along the first direction of the housing and then connected to a side of the adapter facing away from the battery cell, and the bent portion of the tab forming a bent portion; The distance between the two inner side walls of the shell in the first direction is D mm, the dimension of the adapter in the first direction of the shell is d mm, the thickness of the tab is Y mm, and 3≤(Dd) / Y≤150.

2. The battery according to claim 1, characterized in that 5≤(Dd) / Y≤125.

3. The battery according to claim 1, characterized in that 5mm≤Dd≤30mm and / or 0.05mm≤Y≤2.5mm and / or 10mm≤D≤75mm and / or 5mm≤d≤68mm.

4. The battery according to claim 1, characterized in that The overlapping dimension of the tab and the adapter in the first direction of the housing is L1 mm, wherein L1≥d / 2, 8≤(Dd) / Y≤100.

5. The battery according to claim 1, characterized in that The overlapping dimension of the tab and the adapter in the first direction of the housing is L1 mm, wherein d / 4≤L1<d / 2, 8≤(Dd) / Y≤80.

6. The battery according to claim 1, characterized in that The battery cell is provided with one, and the overlapping dimension of the tab and the adapter in the first direction of the housing is L1 mm, wherein 0.4≤L1 / d≤0.9, 8≤(Dd) / Y≤125.

7. The battery according to claim 1, characterized in that At least two battery cells are provided along the first direction of the housing, and the overlapping dimension between the tab of a single battery cell and the adapter in the first direction of the housing is L1 mm, wherein 0.2≤L1 / d≤0.45, 25≤(Dd) / Y≤125.

8. The battery according to claim 1, characterized in that The housing comprises a shell and a cover plate. In the third direction of the housing, at least one side of the shell has an opening. The cover plate is arranged to cover the opening. The pole is arranged on the cover plate. The adapter plate is opposite to and spaced apart from the side surface of the battery cell body in the second direction of the shell, and the tab extends from the side surface of the battery cell body in the second direction of the shell and is connected to the adapter plate. In the third direction of the shell, the distance between one end of the tab close to the cover plate and the cover plate is h1mm, and the distance between one end of the adapter plate close to the cover plate and the cover plate is h2mm, wherein h2<h1.

9. The battery according to claim 8, characterized in that 1mm≤h1-h2≤8mm.

10. The battery according to claim 1, characterized in that The tab extends from the side of the battery cell body in the second direction of the shell, the size of the tab in the third direction of the shell is amm, and the size of the battery cell body in the third direction of the shell is bmm, wherein 0.7≤a / b≤1.

11. The battery according to claim 1, characterized in that The adapter plate is opposite to and spaced apart from the side surface of the battery cell body in the second direction of the shell. The tab extends from the side surface of the battery cell body in the second direction of the shell and is connected to the adapter plate. The size of the tab in the third direction of the shell is amm, and the size of the adapter plate in the third direction of the shell is cmm, wherein 0.15≤c / a≤0.75, 0.1mm≤Y≤2mm.

12. The battery according to claim 1, characterized in that The adapter is opposite to and spaced apart from the side of the battery cell body in the second direction of the shell, the tab extends from the side of the battery cell body in the second direction of the shell, and the tab is spaced apart from a first welding area and a second welding area along the third direction of the shell, the tab is welded to the adapter in the first welding area, the area of ​​the first welding area is larger than the area of ​​the second welding area, wherein 0.05mm≤Y≤2.5mm.

13. The battery according to claim 1, characterized in that The tab includes a plurality of sub-tabs, which are gathered and bent along the first direction of the shell and then connected to the adapter. The tab has a gathered portion formed at the position where the plurality of sub-tabs are gathered, and the gathered portion corresponds to a side of the battery cell body in the first direction of the shell and close to the inner side surface of the shell, wherein 20≤(Dd) / Y≤140.

14. The battery according to claim 1, characterized in that The tab includes a plurality of sub-tabs, which are folded together and bent along the first direction of the shell and then connected to the adapter. The tab forms a folded portion at the position where the plurality of sub-tabs are folded together, and the folded portion corresponds to the middle area of ​​the battery cell body in the first direction of the shell, wherein 10≤(Dd) / Y≤130.

15. The battery according to claim 1, characterized in that The tab includes a plurality of sub-tabs, which are folded together and bent along the first direction of the shell and then connected to the adapter. The tab has a folded portion formed at the position where the plurality of sub-tabs are folded together. The folded portion corresponds to a side of the battery cell body in the first direction of the shell and away from the inner side surface of the shell, wherein 8≤(Dd) / Y≤120.

16. The battery according to claim 1, characterized in that An arc portion is formed between the inner sidewall of the housing in the second direction and the inner sidewall of the housing in the first direction, and the bent portion of the tab is opposite to and spaced from the arc portion, wherein 10≤(Dd) / Y≤150.

17. The battery according to claim 16, characterized in that The size of the arc portion is R, wherein R≥0.5 mm, and 15≤(Dd) / Y≤135.

18. The battery according to claim 17, characterized in that The battery core is a laminated battery core, and the tab extends from a side surface of the battery core body in the second direction of the housing, wherein 10 mm ≤ Dd ≤ 25 mm, and 0.05 mm ≤ Y ≤ 2 mm.

19. The battery according to claim 1, characterized in that The battery core is a wound battery core, wherein 8mm≤Dd≤20mm, and 0.08mm≤Y≤2.4mm.

20. The battery according to claim 1, characterized in that The side of the shell on which the pole is provided is not opposite to the side of the battery cell body on which the pole ear is provided.

21. The battery according to claim 20, characterized in that The adapter plate includes a first connecting portion and a second connecting portion, and an angle is formed between the first connecting portion and the second connecting portion. The first connecting portion is connected to the tab, and the second connecting portion is connected to the pole.

22. The battery according to claim 1, characterized in that The side of the shell on which the pole is provided is arranged opposite to the side of the battery cell body on which the pole ear is provided.

23. The battery according to claim 1, characterized in that The tab includes a plurality of sub-tabs, and the thickness of the sub-tabs is y, wherein 0.002 mm ≤ y ≤ 0.015 mm.

24. The battery according to claim 1, characterized in that An insulating layer is provided on the side of the tab close to the inner side wall of the shell, wherein 30 μm≤d≤60 μm.

25. A battery pack, characterized in that: A battery comprising the battery according to any one of claims 1 to 24.

26. An electrical device, characterized in that: Including the battery pack according to claim 25.

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