CN115863934A - Battery, battery module and electric equipment - Google Patents
Battery, battery module and electric equipment Download PDFInfo
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- CN115863934A CN115863934A CN202211492287.5A CN202211492287A CN115863934A CN 115863934 A CN115863934 A CN 115863934A CN 202211492287 A CN202211492287 A CN 202211492287A CN 115863934 A CN115863934 A CN 115863934A
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- 238000004804 winding Methods 0.000 claims abstract description 33
- 238000003466 welding Methods 0.000 claims abstract description 27
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 230000000994 depressogenic effect Effects 0.000 description 15
- 238000005096 rolling process Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 5
- 230000001788 irregular Effects 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
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Abstract
The application discloses battery, battery module and consumer. The battery comprises a winding core and a connecting piece, wherein the connecting piece is provided with a first end and a second end and comprises a tab connecting part close to the first end and a pole connecting part close to the second end; the winding core comprises a winding core body part and a pole lug, wherein the pole lug is provided with a first end and a second end which are opposite, the first end of the pole lug is connected to the winding core body part, and the second end of the pole lug is connected to the pole lug connecting part; the tab and the tab connecting part have an overlapping area, and a welding part is formed on the overlapping area; the connecting piece is provided with a first fusing part, and the first fusing part is positioned between the tab connecting part and the pole connecting part; and a second fusing part is arranged on the lug and is positioned between the welding part and the winding core body. When the short circuit appears in the roll core, utmost point ear and connection piece can in time fuse.
Description
Technical Field
The application generally relates to the technical field of batteries, and particularly relates to a battery, a battery module and electric equipment.
Background
Secondary batteries (e.g., lithium ion batteries) have advantages of high energy density, high power density, high cycle frequency, and long storage time, and have been widely used in large and medium-sized electric devices such as electric vehicles, electric bicycles, and energy storage facilities.
At present, the tab of a winding core in a secondary battery is generally required to be connected with the pole column through a connecting sheet.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present application and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.
Disclosure of Invention
A main aim at of this application provides a battery, when the short circuit appears in the book core, utmost point ear and connection piece can in time fuse and open circuit.
In order to achieve the purpose of the application, the following technical scheme is adopted in the application:
according to an aspect of the present application, there is provided a battery including:
the connecting piece is provided with a first end and a second end and comprises a tab connecting part close to the first end and a pole connecting part close to the second end;
the winding core comprises a winding core body part and a lug, wherein the lug is provided with a first end and a second end which are opposite, the first end of the lug is connected to the winding core body part, and the second end of the lug is connected to the lug connecting part; the tab and the tab connecting part are provided with an overlapping area, and a welding part is formed on the overlapping area;
the connecting piece is provided with a first fusing part, and the first fusing part is positioned between the tab connecting part and the pole connecting part; and a second fusing part is arranged on the tab and is positioned between the welding part and the winding core body part.
The battery that this embodiment provided, be equipped with first fusing part on the connection piece between utmost point ear connecting portion and utmost point post connecting portion, be equipped with second fusing part on the utmost point ear between weld part and book core body portion, when roll up the inside short circuit of core and lead to utmost point ear and connection piece heavy current to appear, through first fusing part and second fusing part, can guarantee utmost point ear and the timely fusing of connection pad, reach duplicate protection's purpose, the condition that has avoided rolling up a core short-circuit time overlength and cause the battery that the battery temperature too high leads to catches fire or even explodes appears, the security and the reliability of battery have been improved.
According to an embodiment of the present application, a direction in which the first end of the connecting piece points to the second end is a first direction, a direction in which the first end of the tab points to the second end is a second direction, and the first direction intersects with the second direction.
The battery provided by the embodiment has the advantages that the extending direction of the connecting piece is intersected with the extending direction of the lugs, the lugs of a plurality of winding cores can be connected with the connecting piece conveniently, the area of the overlapping area of the lugs and the connecting piece is increased relatively, and the lugs and the connecting piece are welded conveniently.
According to an embodiment of the present application, a distance L between a center position of the first fuse portion and a center position of the second fuse portion in the first direction 1 Comprises the following steps:
wherein W is the maximum width of the tab in the first direction, R 1 A maximum width of the first fusing part in the first direction, coefficient k 1 Is composed of
The battery provided by the embodiment is obtained by making k 1 Be less than 3, can make first fusing part and utmost point ear interval on the first direction less relatively to make first fusing part and second fusing part can in time fuse when the heavy current, it is shorter to roll up core short circuit duration, increases the security of battery, and first fusing part is less relatively with the interval of utmost point ear on the first direction, can reduce design cost. Meanwhile, the application makes k 1 Is greater than
Avoiding the first fusing part and the tab in the first directionThe distance is too small, so that the tab and the connecting sheet can be conveniently assembled.
According to one embodiment of the application, the tab is welded to the connecting sheet, and after the tab is welded to the connecting sheet, a welding part is formed on the overlapping area; in the second direction, the distance L between the welding part and the side edge of the connecting sheet facing the first end of the tab 2 Comprises the following steps:
L 2 ＝k 2 R 2
wherein R is 2 A coefficient k for a maximum width of the second fusing part in the second direction 2 Is composed of
The battery provided by the present embodiment, k 2 R 2 The distance between the welding part and the side edge of the connecting sheet is set by
The maximum width of the second fusing part is doubled, so that the distance between the side edge of the welding part and the side edge of the connecting piece is relatively small, the first fusing part and the second fusing part can be fused in time when large current flows, the short-circuit duration of the winding core is shorter, and the safety of the battery is improved; meanwhile, the distance between the side edge of the welding part and the side edge of the connecting piece is relatively small, and the design cost can be reduced.
According to an embodiment of the present application, in the second direction, a distance L between a side edge of the second fusing part and a side edge of the adjacent connecting piece 3 Comprises the following steps:
L 3 ＝k 3 R 2
wherein R is 2 A coefficient k for a maximum width of the second fusing part in the second direction 3 Is composed of
The battery provided by the present embodiment, k 3 R 2 Between the second fusing part and the connecting sheetBy making the pitch be
The maximum width of the second fusing part is doubled, so that the shortest distance between the second fusing part and the connecting sheet is relatively small, the first fusing part and the second fusing part can be fused in time under the condition of large current, the short circuit duration of the winding core is shorter, and the safety of the battery is improved; meanwhile, the distance between the second fusing part and the connecting sheet is relatively small, and the design cost can be reduced.
According to an embodiment of the present application, the first fusing portion is a first recess portion that penetrates the connection piece from a thickness direction of the connection piece.
In the battery provided by the embodiment, the first fusing part is the first depressed part which penetrates through the connecting sheet from the thickness direction of the connecting sheet, so that the connecting sheet does not carry current at the first fusing part, and only carries current through the region except the first fusing part, when a large current occurs, the current carrying of the region except the first fusing part is too large, and the first fusing part can be fused in time, so that the fusing effect of the first fusing part is improved.
According to an embodiment of the present application, a maximum width of the first recess portion is 20% to 50% of a maximum width of the connection piece in a width direction of the connection piece.
The battery that this embodiment provided, through 20% -50% that make the maximum width of first depressed part be the maximum width of connection piece, under the structural strength who guarantees the connection piece and satisfy the prerequisite that overflows for the width of the first depressed part of this position is great relatively, thereby when the short circuit appears in rolling up the core, the connection piece can in time be followed first depressed part and gone out the fusing and realize opening circuit, increases the security of battery.
According to an embodiment of the present application, the first recess includes a first notch, a first through hole, and a second notch distributed along a width direction of the connecting sheet, and maximum widths of the first notch, the first through hole, and the second notch in a length direction of the connecting sheet are the same.
The battery that this embodiment provided, first breach, first through-hole and the second breach through the width direction distribution along the connection piece for form a plurality of depressed parts on the connection piece, thereby when the heavy current appeared in the connection piece, the connection piece can be followed first breach, first through-hole and second breach and further accelerated the speed of fusing, and then accelerates to open circuit, increases the security of battery.
According to an embodiment of the present application, the second fusing part is a second recess part penetrating the tab from a thickness direction of the tab.
The battery provided by the embodiment has the advantages that the second fusing part is the second sunken part which penetrates through the lug in the thickness direction of the lug, so that the lug does not carry out current carrying at the second fusing part, and only carries out current carrying through the region except the second fusing part, when a large current appears, the current carrying of the region except the second fusing part is too large, the second fusing part can be fused in time, and the fusing effect of the second fusing part is improved.
According to an embodiment of the present invention, the maximum width of the second recessed portion is 20% to 50% of the maximum width of the tab in the width direction of the tab.
The battery that this embodiment provided, through the maximum width that makes the second depressed part for the maximum width's of utmost point ear 20% -50%, under the prerequisite that guarantees the structural strength of utmost point ear and satisfy overflowing for the width of the second depressed part of this position is great relatively, thereby when the short circuit appears in the book core, and the utmost point ear can in time go out the fusing from the second depressed part and realize opening circuit, increases the security of battery.
According to an embodiment of the present application, the second recess includes a second through hole located at an intermediate position of the tab in a width direction of the tab.
According to another aspect of the present application, there is provided a battery module including the battery according to any one of the above embodiments.
The battery module that this embodiment provided, be equipped with first fusing part on the connection piece of battery between utmost point ear connecting portion and utmost point post connecting portion, be equipped with second fusing part on the utmost point ear between weld part and roll core body portion, when roll core internal short circuit leads to utmost point ear and connection piece to appear the heavy current, through first fusing part and second fusing part, can guarantee utmost point ear and connection pad in time fusing, reach duplicate protection's purpose, avoided rolling up core short-circuit time overlength and cause the battery that battery temperature too high leads to catch fire the fire even the condition of explosion appears, the security and the reliability of battery have been improved, and then the security and the reliability of battery module have been improved.
According to still another aspect of the present application, a powered device is provided, and the powered device includes the above battery module.
This embodiment provides a consumer, be equipped with first fusing part on the connection piece of battery between utmost point ear connecting portion and utmost point post connecting portion, be equipped with second fusing part on the utmost point ear between weld part and the core body portion of rolling up, when the internal short circuit of book core leads to utmost point ear and connection piece to appear heavy current, through first fusing part and second fusing part, can guarantee utmost point ear and the timely fusing of connection pad, reach duplicate protection's purpose, the battery that has avoided rolling up core short-circuit time overlength and lead to the fact the battery high temperature to lead to catches fire or even explodes the condition appears, the security and the reliability of battery have been improved, and then the security and the reliability of consumer have been improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The above and other features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 is a schematic view of a battery provided in one embodiment of the present application;
fig. 2 is a schematic view of a tab and tab of a battery provided in accordance with an embodiment of the present application;
fig. 3 is a schematic view illustrating a battery module according to an embodiment of the present disclosure;
FIG. 4 is a schematic illustration of a vehicle provided in an embodiment of the present application.
Description of the reference numerals:
10. connecting sheets; 110. a tab connecting part; 1110. a first fusing part; 1111. a first through hole; 1112. a first notch; 1113. a second notch; 120. a pole connecting part; 130. a boss portion;
20. a winding core; 210. a winding core body part; 220. a tab; 230. a second fusing part;
30. welding the part;
40. a battery module;
50. a vehicle.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.
Embodiments of the present application first provide a battery, as shown in fig. 1 and 2, including: a connecting piece 10 and a winding core 20. The connecting sheet 10 has a first end and a second end opposite to each other, and the connecting sheet 10 includes a tab connecting portion 110 near the first end and a post connecting portion 120 near the second end; the winding core 20 comprises a winding core body part 210 and a tab 220, the tab 220 comprises a first end and a second end which are opposite, the first end of the tab 220 is connected to the winding core body part 210, and the second end of the tab 220 is connected to the tab connecting part 110; the tab 220 and the connection piece 10 have an overlapping area, and a welding portion 30 is formed on the overlapping area.
The connecting sheet 10 is provided with a first fusing part 1110, and the first fusing part 1110 is located between the tab connecting part 110 and the post connecting part 120; the tab 220 is provided with a second fusing part 230, and the second fusing part 230 is located between the welding part 30 and the winding core body part 210. The maximum overcurrent of the connecting sheet 10 at the first fusing part 1110 is small, and when the winding core 20 is short-circuited, the large current can fuse the first fusing part 1110 due to the excessive current; meanwhile, the maximum overcurrent of the tab 220 at the second fusing part 230 is small, and when the winding core 20 is short-circuited, the second fusing part 230 is fused by the large current due to the large current.
The application provides a battery, be equipped with first fusing part 1110 on connection piece 10 between utmost point ear connecting portion 110 and utmost point post connecting portion 120, be equipped with second fusing part 230 on utmost point ear 220 between weld part 30 and roll core body portion 210, when roll core internal short circuit leads to utmost point ear 220 and connection piece 10 to appear the heavy current, through first fusing part 1110 and second fusing part 230, can guarantee utmost point ear 220 and connection piece 10 in time fusing, reach duplicate protection's purpose, avoided roll core short-circuit time overlength and caused the battery that battery temperature too high leads to catch fire the condition of explosion even and appear, the security and the reliability of battery have been improved.
In one embodiment of the present disclosure, as shown in fig. 1, the battery includes two winding cores 20 and two connecting sheets 10, the winding core 20 includes a first pole piece, a separator and a second pole piece, the first pole piece, the separator and the second pole piece are stacked and wound to form a body portion 210, two tabs 220 are connected to the winding core body portion 210 of the winding core 20, one of the two tabs 220 is a positive tab, and the other tab is a negative tab. One of the two connecting pieces 10 is a positive connecting piece, and the other is a negative connecting piece. The tab 10 includes a pole connecting portion 120, a boss portion 130, and two pole tab connecting portions 110. Two tab connection portions 110 of the positive connection piece are respectively welded with the positive tabs of the two winding cores 20, and two tab connection portions 110 of the negative connection piece are respectively welded with the negative tabs of the two winding cores 20.
Specifically, as shown in fig. 2, a direction in which the first end of the connecting piece 10 points to the second end is a first direction X, which is a length direction of the connecting piece 10. The direction of the first end of the tab 220 pointing to the second end is a second direction Y, which is the length direction of the tab 220, and the first direction X intersects with the second direction Y. Through making the extending direction of utmost point ear connecting portion 110 of connection piece 10 intersect with the extending direction of utmost point ear 220, can be convenient for connection piece 10 connect the utmost point ear 220 of a plurality of cores 20 simultaneously, improve the area of the overlapping region of utmost point ear 220 and connection piece 10 relatively simultaneously, be convenient for utmost point ear 10 and connection piece 10 weld, avoided utmost point ear connecting portion 110's width too big. Illustratively, the length direction of the tab 220 is perpendicular or substantially perpendicular to the length direction of the connecting piece 10, i.e. the first direction X is perpendicular or substantially perpendicular to the second direction Y. Of course, the length direction of the tab 220 and the length direction of the connecting piece 10 may be parallel, which is not limited in this application. Hereinafter, the description will be exemplarily made with the lengthwise direction of the tab 220 being perpendicular to the lengthwise direction of the connecting piece 10, i.e., the first direction X being perpendicular to the second direction Y.
Specifically, the first fusing part 1110 is a first recess part penetrating the tab connecting part 110 from the thickness direction of the tab connecting part 110. By making the first fusing part 1110 be the first recess part penetrating the tab connecting part 110 in the thickness direction of the tab connecting part 110, the tab connecting part 110 does not carry out current carrying at the first fusing part 1110, and carries out current carrying only through the region other than the first fusing part 1110, and when a large current occurs, the region other than the first fusing part 1110 carries too much current, and can fuse in time, thereby improving the fusing effect of the first fusing part 1110. Of course, first fusing portion 1110 also can be a recess portion that does not penetrate through tab connecting portion 110 from the thickness direction of tab connecting portion 110, and reduces the thickness of tab connecting portion 110 at this position through recessing to the resistance at this position has relatively been increased, and when heavy current appeared, first fusing portion 1110 calorific capacity was great relatively, and fuse in time was realized.
The maximum width of the first recessed portion in the width direction of the tab connecting portion 110 is 20% to 50%, for example, 20%, 25%, 30%, 35%, 40%, 45%, 50%, etc., of the maximum width of the tab connecting portion 110, which is not specifically listed herein. Through making the maximum width of first depressed part for 20% ~ 50% of the maximum width of utmost point ear connecting portion 110, under the prerequisite that guarantees utmost point ear connecting portion 110 structural strength and satisfy overflowing for the width of the first depressed part of this position is great relatively, thereby when the short circuit appears in rolling up the core, connection piece 10 can in time be followed first depressed part and go out the fusing and realize opening circuit, increases the security of battery. Of course, the maximum width of the first recess portion may be less than 20% of the maximum width of the tab connecting portion 110, or greater than 50% of the maximum width of the tab connecting portion 110, which is not limited in the present application.
As shown in fig. 2, the first recess includes a first notch 1112, a first through hole 1111 and a second notch 1113 distributed along the width direction of the tab connection part 110, and the maximum widths of the first notch 1112, the first through hole 1111 and the second notch 1113 in the length direction of the tab connection part 110 are the same. First breach 1112, first through-hole 1111 and the second breach 1113 through the width direction distribution along utmost point ear connecting portion 110 for form a plurality of depressed parts on the utmost point ear connecting portion 110, thereby when utmost point ear connecting portion 110 appears the heavy current, utmost point ear connecting portion 110 can be followed first breach 1112, first through-hole 1111 and second breach 1113 department and further accelerated the speed of fusing, and then accelerate to open circuit, increases the security of battery. Of course, the first through holes 1111 and the plurality of notches may be further included, and all of the first through holes may be also included, or all of the first through holes may be also included, which is not limited in this application.
The first through hole 1111 is circular, the first notch 1112 and the second notch 1113 are circular, and the first through hole 1111, the first notch 1112 and the second notch 1113 have the same diameter, that is, the maximum width of the first through hole 1111, the first notch 1112 and the second notch 1113 is the same in the length direction of the tab connecting part 110. Of course, the diameters of the first through hole 1111, the first notch 1112 and the second notch 1113 may be different, the first through hole 1111 may also be rectangular, trapezoidal, triangular or irregular, and the first notch 1112 and the second notch 1113 may also be rectangular, trapezoidal, triangular or irregular.
The connecting sheet 10 may be a flexible connecting sheet or a rigid connecting sheet, which is determined according to the specific requirements of the battery structure and is not limited in the present application.
Specifically, the second fusing part 230 is a second recess part penetrating the tab 220 from the thickness direction of the tab 220. The second fusing part 230 is a second recess part penetrating through the tab 220 in the thickness direction of the tab 220, so that the tab 220 does not carry current at the second fusing part 230, and only carries current through the region except the second fusing part 230, when a large current is generated, the region except the second fusing part 230 carries too much current, and can be fused in time, and thus the fusing effect of the second fusing part 230 is improved. Of course, the second fusing part 230 may also be a recess that does not penetrate the tab 220 in the thickness direction of the tab 220, and the thickness of the tab 220 at this position is reduced by the recess, so that the resistance at this position is relatively increased, and when a large current occurs, the first fusing part 1110 generates a relatively large amount of heat, and can fuse in time, thereby achieving a fusing effect. When the tab 220 includes a plurality of tabs, the second recesses on the tabs 220 overlapped together are completely overlapped or partially overlapped, and the sizes of the second recesses on the tabs 220 are the same.
Wherein, in the width direction of the tab 220, the maximum width of the second recess is 20% to 50% of the maximum width of the tab 220. For example, 20%, 25%, 30%, 35%, 40%, 45%, 50%, etc., which are not specifically listed herein. The maximum width through making the second depressed part is 20% -50% of the maximum width of utmost point ear 220, under the prerequisite of guaranteeing utmost point ear 220's structural strength and satisfying the overcurrent for the width of the second depressed part of this position is great relatively, thereby when the short circuit appears in rolling up the core, utmost point ear 220 can in time follow the second depressed part and go out the fusing and realize opening circuit, increases the security of battery. Of course, the maximum width of the second recess portion may also be less than 20% of the maximum width of the tab 220, or greater than 50% of the maximum width of the tab 220, which is not limited in the present application.
As shown in fig. 2, the tab 220 is trapezoidal, and the width of the first end of the tab 220 is greater than the width of the second end, that is, the width of the end of the tab 220 connected to the winding core is the largest. Of course, the tab 220 may have a rectangular shape, that is, the tab 220 has the same width at each position in the length direction.
Wherein the second recess portion includes a second through hole located at a middle position of the tab 220 in a width direction of the tab 220. Set up the second through-hole through the intermediate position at utmost point ear 220, when utmost point ear 220 appears the heavy current, utmost point ear 220 can be followed the both sides of second through-hole and fused simultaneously, and then accelerate to open circuit, increases the security of battery. Of course, a plurality of second through holes may be further included, and the second through holes may also be located at a position close to one side of the tab 220 in the width direction, which is not limited in the present application.
Wherein the second through hole is circular, that is, the maximum width of the second through hole is the diameter in the width direction of the tab 220. Of course, the second through hole may have a rectangular, trapezoidal, triangular or irregular shape.
Specifically, as shown in fig. 2, in the first direction X, a distance L between a center position of the first fusing portion 1110 and a center position of the second fusing portion 230 1 Comprises the following steps:
where W is the maximum width of the tab 220 in the first direction X, and R 1 Is the maximum width (R) of the first fusing part 1110 in the first direction X 1 E.g., the diameter of the first through-hole 1111)), the coefficient k 1 Is composed of
E.g. based on->
1、/>
2、/>
3, etc., which are not listed herein. Illustratively, the distance L between the center position of the first fuse portion 1110 and the center position of the second fuse portion 230 1 The distance between the centers of the first through hole 1111 and the second through hole in the first direction X may be used.
In the example, the maximum width W of the tab 220, the width H of the tab connection part 110 of the connection piece 10, and the maximum width R of the first fusing part 1110 are set 1 The maximum width R of the second fusing part 230 2 With constant sum current, k 1 When the values are different, the corresponding short-circuit time is shown in table 1:
wherein, the maximum width W of the tab 220 and the maximum width R of the first fusing part 1110 in the formula 1 Is a fixed value, k 1 Is the only variable in the formula; thus, k 1 Determines the distance between the first fusing portion 1110 and the tab 220 in the first direction X. According to Table 1, when k 1 When the distance between the first fusing part 1110 and the tab 220 in the first direction X is larger than 3, the short circuit duration of the winding core is longer, and the potential safety hazard of the battery is larger; the application makes k 1 Less than 3, can make first fuse portion 1110 and utmost point ear 220 interval on first direction X relatively less to make first fuse portion 1110 and second fuse portion 230 can in time fuse when the heavy current, it is shorter to roll up core short circuit duration, increases the security of battery, and first fuse portion 1110 and utmost point ear 220 interval on first direction X are relatively less, can reduce design cost. Meanwhile, the application is realized by enabling k 1 Is greater than
The first fusing part 1110 is prevented from being excessively spaced from the tab 220 in the first direction X, so that the tab 220 and the connecting sheet 10 can be conveniently assembled.
Specifically, as shown in fig. 2, the tab 220 and the tab connection part 110 are ultrasonically welded together in an overlapping area, and after welding, an ultrasonic weld mark is formed on the overlapping area of the tab 220 and the tab connection part 110, and the area having the weld mark is the welding part 30; the distance L between the welding part 30 and the side edge of the connecting piece 10 facing the first end of the tab 220 in the second direction Y 2 Comprises the following steps:
L 2 ＝k 2 R 2
wherein R is 2 Is the maximum width (R) of the second fusing part 230 in the second direction Y 2 E.g., the diameter of the second via), coefficient k 2 Is composed of
E.g. based on->
1, etc., which are not listed herein.
For example, the maximum width W of the tab 220, the width H of the tab connecting portion 110 of the connecting piece 10, and the maximum width R of the first fuse portion 1110 are set 1 Maximum width R of the second fuse portion 230 2 With constant sum current, k 2 When the values are different, the corresponding short-circuit time is shown in table 2:
wherein k is 2 R 2 The distance between the welding part 30 and the side of the connecting piece 10 is k when the welding part 30 is parallel to the side of the connecting piece 10 2 R 2 The distance between the welding part 30 and the opposite side edge of the connecting sheet 10 at any position; when the welding part 30 is not parallel to the side of the connecting piece 10, k 2 R 2 The average distance between the welding portion 30 and the side edge of the connecting piece 10. According to table 2, when the interval is greater than 1 time the maximum width of the second fusing part 230, the interval between the side edge of the welding part 30 and the side edge of the connection piece 10 is relatively large, the core short circuit duration is long, and the potential safety hazard of the battery is large; this application is through making this interval be less than 1 times the maximum width of second fuse portion 230 for the interval of the side of welding part 30 and the side of connection piece 10 is less relatively, thereby make first fuse portion 1110 and second fuse portion 230 can in time fuse when the heavy current, it is shorter to roll up core short circuit duration, increase the security of battery, and the interval of the side that makes welding part 30 and the side of connection piece 10 is less relatively, can reduce design cost. Meanwhile, the distance between the welding part 30 and the side edge of the connecting sheet 10 is larger than
The maximum width of the second fusing part 230 is doubled, so that ultrasonic welding is facilitated after the tab 220 and the connecting sheet 10 are assembled, and the tab 220 is prevented from being torn due to the fact that an ultrasonic pressure head presses the side edge of the connecting sheet 10.
Specifically, as shown in fig. 2, in the second direction Y, the side of the second fusing part 230 is adjacent to the connecting piece 10 side distance L 3 That is, the shortest distance between the side of the second fusing part 230 and the side of the connecting piece 10 is:
L 3 ＝k 3 R 2
wherein R is 2 Is the maximum width of the second fusing part 230 in the second direction Y, coefficient k 3 Is composed of
For example
1、/>
2, etc., which are not listed herein. Illustratively, the distance L between the side edge of the second fuse portion 230 and the side edge of the adjacent connecting tab 10 3 。
For example, the maximum width W of the tab 220, the width H of the tab connecting portion 110 of the connecting piece 10, and the maximum width R of the first fuse portion 1110 are set 1 The maximum width P of the second fusing part 230 2 With constant sum current, k 3 When the values are different, the corresponding short-circuit time is shown in table 3:
wherein k is 3 R 2 The shortest distance between the second fusing part 230 and the connecting tab 10. According to table 3, when the distance is greater than 2 times the maximum width of the second fusing part 230, the core short-circuit duration is long, and the potential safety hazard of the battery is large; this application is through making this interval be less than 2 times the maximum width of second fuse portion 230 for the shortest distance between second fuse portion 230 and the connection piece 10 is less relatively, thereby makes first fuse portion 1110 and second fuse portion 230 can in time fuse when the heavy current, it is shorter to roll up core short circuit duration, increase the security of battery, and make the interval of second fuse portion 230 and connection piece 10 less relatively, can reduce design cost. At the same time, lead toThe shortest distance between the second fusing part 230 and the connecting piece 10 is made larger than
The maximum width of the second fusing part 230 is doubled to facilitate the assembly of the tab 220 with the connecting tab 10.
Embodiments of the present application also provide a battery module, as shown in fig. 3, the battery module 40 includes the above battery, and the battery module 40 may be, for example, a battery pack. The application provides a battery module, be equipped with first fusing part on the connection piece of battery between utmost point ear connecting portion and utmost point post connecting portion, be equipped with second fusing part on the utmost point ear between weld part and the core body portion of rolling up, when rolling up the inside short circuit of core and leading to utmost point ear and connection piece heavy current to appear, through first fusing part and second fusing part, can guarantee utmost point ear and the timely fusing of connection pad, reach duplicate protection's purpose, the battery that has avoided rolling up core short circuit time overlength and lead to the fact the battery high temperature to lead to catches fire or even explodes the condition appears, the security and the reliability of battery have been improved, and then the security and the reliability of battery module have been improved.
Embodiments of the present application also provide a powered device, which includes the above battery module, and the powered device may be, for example, an energy storage device or a vehicle 50 as shown in fig. 4. The application provides a consumer, be equipped with first fusing part on the connection piece of battery between utmost point ear connecting portion and utmost point post connecting portion, be equipped with second fusing part on utmost point ear between weld part and book core body portion, when roll up the inside short circuit of core and lead to utmost point ear and connection piece heavy current to appear, through first fusing part and second fusing part, can guarantee utmost point ear and the timely fusing of connection pad, reach duplicate protection's purpose, the condition that has avoided rolling up a core short-circuit time overlength and cause the battery that the battery temperature too high leads to catches fire or even explodes appears, the security and the reliability of battery have been improved, and then the security and the reliability of consumer have been improved.
In the examples of this application, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the examples of the application can be understood by those skilled in the art according to specific situations.
In the description of the embodiments of the application, it should be understood that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the embodiments of the application and for simplifying the description, but do not indicate or imply that the referred devices or units must have a specific direction, be configured and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the application.
In the description herein, the description of the term "one embodiment" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiment or example. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the claimed embodiments and is not intended to limit the claimed embodiments, and various modifications and changes may be made to the claimed embodiments by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the applied embodiment shall be included in the protection scope of the applied embodiment.
Claims (13)
1. A battery, comprising:
the connecting piece is provided with a first end and a second end and comprises a tab connecting part close to the first end and a pole connecting part close to the second end;
the winding core comprises a winding core body part and a lug, wherein the lug is provided with a first end and a second end which are opposite, the first end of the lug is connected to the winding core body part, and the second end of the lug is connected to the lug connecting part; the tab and the tab connecting part are provided with an overlapping area, and a welding part is formed on the overlapping area;
the connecting piece is provided with a first fusing part, and the first fusing part is positioned between the tab connecting part and the pole connecting part; and a second fusing part is arranged on the tab and positioned between the welding part and the roll core body part.
2. The battery of claim 1, wherein the direction in which the first end of the connecting tab points toward the second end is a first direction, the direction in which the first end of the tab points toward the second end is a second direction, and the first direction intersects the second direction.
3. The battery according to claim 2, wherein a distance L between a center position of the first fusing portion and a center position of the second fusing portion in the first direction 1 Comprises the following steps:
wherein W is the maximum width of the tab in the first direction, R 1 A maximum width of the first fusing part in the first direction, coefficient k 1 Is composed of
4. The battery of claim 2, wherein in the second direction, a distance L between the weld and a side of the tab facing the first end of the tab 2 Comprises the following steps:
L 2 ＝k 2 R 2
wherein R is 2 A coefficient k for a maximum width of the second fusing part in the second direction 2 Is composed of
5. The battery according to claim 2, wherein a distance L between a side of the second fusing portion and a side of the adjacent connecting tab in the second direction 3 Comprises the following steps:
L 3 ＝k 3 R 2
wherein R is 2 A coefficient k for a maximum width of the second fusing part in the second direction 3 Is composed of
6. The battery according to claim 1, wherein the first fusing portion is a first recess that penetrates the connection tab from a thickness direction of the connection tab.
7. The battery according to claim 6, wherein the maximum width of the first depression is 20% to 50% of the maximum width of the connection tab in the width direction of the connection tab.
8. The battery according to claim 6, wherein the first depression includes a first notch, a first through hole, and a second notch distributed along the width direction of the connecting tab, and the maximum widths of the first notch, the first through hole, and the second notch in the length direction of the connecting tab are the same.
9. The battery according to claim 1, wherein the second fusing part is a second recess part penetrating the tab in a thickness direction thereof.
10. The battery according to claim 9, wherein the maximum width of the second recess is 20-50% of the maximum width of the tab in the width direction of the tab.
11. The battery according to claim 9, wherein the second recess portion includes a second through-hole located at an intermediate position of the tab in a width direction of the tab.
12. A battery module comprising the battery according to any one of claims 1 to 11.
13. An electric device, characterized by comprising the battery module according to claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211492287.5A CN115863934A (en) | 2022-11-25 | 2022-11-25 | Battery, battery module and electric equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211492287.5A CN115863934A (en) | 2022-11-25 | 2022-11-25 | Battery, battery module and electric equipment |
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| CN115863934A true CN115863934A (en) | 2023-03-28 |
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| CN202211492287.5A Pending CN115863934A (en) | 2022-11-25 | 2022-11-25 | Battery, battery module and electric equipment |
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