Battery monomer, battery pack with battery monomer and power utilization device

Abstract

The invention discloses a single battery, a battery pack with the single battery and a power utilization device, the single battery comprises a pole core, and in a first direction, the same end part of the pole core is provided with a positive pole lug and a negative pole lug; a first through hole and a second through hole are formed in the first insulating part, the first through hole and the second through hole are arranged in a staggered mode in the second direction and / or the third direction, the first direction, the second direction and the third direction are perpendicular to one another, and the positive pole lug penetrates through the first through hole and is suitable for being electrically connected with the positive pole fixed to the cover plate; and the negative pole lug penetrates through the second through hole and is suitable for being electrically connected with a negative pole fixed on the cover plate. According to the battery monomer disclosed by the embodiment of the invention, the positive tab is bundled by utilizing the first through hole, and the negative tab is bundled by utilizing the second through hole, so that the positive tab and the negative tab are spaced, the positions of the positive tab and the negative tab are limited, and the possibility of contact between the positive tab and the negative tab is reduced; and the risk of short circuit of the battery monomers is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of battery cells, and in particular to a battery cell and a battery pack and an electric device having the same. Background Art

[0002] In the related art, the positive electrode column and the negative electrode column are both arranged on the same side of the battery cell. Due to limited space, when a high-voltage arc is generated, the battery cell is prone to internal short circuit. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a battery cell, which uses a first through hole to converge the positive electrode tab and a second through hole to converge the negative electrode tab, so that the positive electrode tab and the negative electrode tab are spaced apart, and the positions of the positive electrode tab and the negative electrode tab are limited, so as to increase the width of the positive electrode tab and the negative electrode tab while reducing the possibility of contact between the positive electrode tab and the negative electrode tab, thereby reducing the risk of short circuit of the battery cell and improving the current carrying capacity of the positive electrode tab and the negative electrode tab.

[0004] The present invention also provides a battery pack having the battery cell.

[0005] The present invention also provides an electrical device having the battery pack.

[0006] According to a first aspect of an embodiment of the present invention, a battery cell comprises: a shell having an open opening in the first direction; a pole core having a positive pole tab and a negative pole tab at the same end thereof in the first direction; a cover plate, the cover plate covering the open opening; a first insulating member, the first insulating member being located between the pole core and the cover plate, the first insulating member being provided with a first through hole and a second through hole, the first through hole and the second through hole being staggered in the second direction and / or the third direction, the first direction, the second direction and the third direction being perpendicular to each other, wherein the positive pole tab passes through the first through hole and is suitable for being electrically connected to the positive pole column fixed on the cover plate, and the negative pole tab passes through the second through hole and is suitable for being electrically connected to the negative pole tab fixed on the cover plate.

[0007] According to the battery cell of the embodiment of the present invention, the positive electrode tab is converged by the first through hole, and the negative electrode tab is converged by the second through hole, so that the positive electrode tab and the negative electrode tab are spaced apart, and at the same time the positions of the positive electrode tab and the negative electrode tab are limited, so as to reduce the possibility of contact between the positive electrode tab and the negative electrode tab while increasing the width of the positive electrode tab and the negative electrode tab, thereby reducing the risk of short circuit in the battery cell and improving the current carrying capacity of the positive electrode tab and the negative electrode tab.

[0008] In addition, the battery cell according to the above embodiment of the present invention may also have the following additional technical features:

[0009] According to some optional embodiments of the present invention, in the second direction, side walls of the first through hole and the second through hole facing each other are arranged at intervals in the second direction.

[0010] According to some optional embodiments of the present invention, an insulating spacer protruding from the first through hole is provided on the first insulating member, and the insulating spacer is located between the first through hole and the second through hole.

[0011] According to some specific embodiments of the present invention, the second direction is a height direction of the battery cell, the third direction is a thickness direction of the battery cell, and the insulating separator extends along the third direction.

[0012] According to some optional embodiments of the present invention, the portion of the positive electrode tab passing through the first through hole is bent to form a positive electrode connection flange, and the portion of the negative electrode tab passing through the second through hole is bent to form a negative electrode connection flange.

[0013] According to some specific embodiments of the present invention, the bending direction of the positive electrode connection flange is opposite to the bending direction of the negative electrode connection flange.

[0014] According to some embodiments of the present invention, the battery cell further comprises a first electrical connection sheet and a second electrical connection sheet, wherein the first electrical connection sheet is electrically connected to the positive electrode tab and the positive electrode column respectively, and the second electrical connection sheet is electrically connected to the negative electrode tab and the negative electrode column respectively.

[0015] According to some optional embodiments of the present invention, the first electrical connecting sheet includes a first connecting portion and a second connecting portion, the second connecting portion is located on one side of the first connecting portion in the second direction, the first connecting portion is electrically connected to the positive electrode tab, and the second connecting portion is electrically connected to the positive electrode column; the second electrical connecting sheet includes a third connecting portion and a fourth connecting portion, the fourth connecting portion is located on one side of the third connecting portion in the second direction, the third connecting portion is electrically connected to the negative electrode tab, and the fourth connecting portion is electrically connected to the negative electrode column.

[0016] According to some specific embodiments of the present invention, the first connection portion and the third connection portion are arranged at intervals in the third direction, and the second connection portion and the fourth connection portion are arranged at intervals in the second direction.

[0017] According to some optional embodiments of the present invention, in the second direction, side walls of the first connection portion and the third connection portion facing each other are arranged at intervals in the second direction.

[0018] According to some specific embodiments of the present invention, in the second direction, the distance between the side walls of the first connection portion and the third connection portion facing each other is X, wherein 4mm≤X; and\or, in the third direction, the distance between the side walls of the first connection portion and the third connection portion facing each other is Y, wherein 1mm≤Y.

[0019] According to some optional embodiments of the present invention, the battery cell further includes a second insulating member, wherein the second insulating member is located between the first electrical connection sheet and the cover plate, and between the second electrical connection sheet and the cover plate.

[0020] According to some embodiments of the present invention, the positive electrode tab and the negative electrode tab are respectively provided at two ends of the pole core in the first direction.

[0021] According to a second aspect of the present invention, a battery pack is provided. The battery pack includes the battery cell according to the embodiment of the first aspect of the present invention.

[0022] According to the battery pack of the embodiment of the present invention, by utilizing the battery cell described in the embodiment of the first aspect of the present invention, the positive pole tab is converged by utilizing the first through hole, and the negative pole tab is converged by utilizing the second through hole, so that the positive pole tab and the negative pole tab are spaced apart, and at the same time, the positions of the positive pole tab and the negative pole tab are limited, so as to increase the width of the positive pole tab and the negative pole tab while reducing the possibility of contact between the positive pole tab and the negative pole tab, thereby reducing the risk of short circuit in the battery cell and improving the current carrying capacity of the positive pole tab and the negative pole tab.

[0023] According to an embodiment of a third aspect of the present invention, an electric device is provided, wherein the electric device comprises the battery pack according to the embodiment of the second aspect of the present invention.

[0024] According to the electrical device of the embodiment of the present invention, by utilizing the battery pack described in the embodiment of the second aspect of the present invention, the positive pole tab is converged by utilizing the first through hole, and the negative pole tab is converged by utilizing the second through hole, so that the positive pole tab and the negative pole tab are spaced apart, and at the same time, the positions of the positive pole tab and the negative pole tab are limited, so as to increase the width of the positive pole tab and the negative pole tab while reducing the possibility of contact between the positive pole tab and the negative pole tab, thereby reducing the risk of short circuit of the battery cell and improving the current carrying capacity of the positive pole tab and the negative pole tab.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1 is a schematic structural diagram of a battery cell according to an embodiment of the present invention;

[0028] Figure 2 is a side view of a battery cell according to an embodiment of the present invention;

[0029] Figure 3 is a structural exploded view of a battery cell according to an embodiment of the present invention;

[0030] Figure 4 is a structural exploded view of a battery cell according to an embodiment of the present invention;

[0031] Figure 5 is a schematic structural diagram of a first insulating member according to an embodiment of the present invention;

[0032] Figure 6 is a cross-sectional view of a battery cell in one direction according to some embodiments of the present invention;

[0033] Figure 7 is a cross-sectional view of a battery cell in another direction according to some embodiments of the present invention;

[0034] Figure 8 are cross-sectional views of battery cells according to other embodiments of the present invention;

[0035] Fig. 9 is a schematic structural diagram of a second insulating member and a first electrical connecting piece and a second electrical connecting piece according to an embodiment of the present invention;

[0036] Fig.10 is a schematic structural diagram of multiple battery cells and a power connection sheet according to an embodiment of the present invention;

[0037] Fig.11 FIG. 4 is a front view of a plurality of battery cells and a power strip according to an embodiment of the present invention.

[0038] Reference numerals: 1. battery cell;

[0039] 10. Shell; 11. Open mouth;

[0040] 20, pole core; 21, positive pole ear; 211, positive pole connection flange; 22, negative pole ear; 221, negative pole connection flange;

[0041] 31. Positive pole; 32. Negative pole;

[0042] 40. first insulating member; 41. first through hole; 42. second through hole; 43. insulating separator;

[0043] 51, first electrical connection sheet; 511, first connection portion; 512, second connection portion; 52, second electrical connection sheet; 521, third connection portion; 522, fourth connection portion;

[0044] 60. Cover plate; 65. Second insulating member; 68. Explosion-proof valve; 70. Electrical connection plate. DETAILED DESCRIPTION

[0045] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0046] A battery cell 1 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0047] like Figure 1-Figure 4 As shown, the battery cell 1 according to the embodiment of the present invention includes a housing 10 , a pole core 20 , a cover plate 60 and a first insulating member 40 .

[0048] The shell 10 has an opening 11 in the first direction. In the first direction, the same end of the pole core 20 has a positive pole tab 21 and a negative pole tab 22 . The cover plate 60 is disposed on the opening 11 to protect the pole core 20 with the cover plate 60 and the shell 10 .

[0049] The first insulating member 40 is located between the pole core 20 and the cover plate 60 to separate the cover plate 60 and the pole core 20 to prevent the pole core 20 from making electrical contact with the cover plate 60 and to prevent the current on the pole core 20 from flowing to the cover plate 60 , thereby preventing the battery cell 1 from leaking electricity.

[0050] The first insulating member 40 is provided with a first through hole 41 and a second through hole 42, and the first through hole 41 and the second through hole 42 are staggered in the second direction and / or the third direction, and the first direction, the second direction and the third direction are perpendicular to each other. The positive pole tab 21 passes through the first through hole 41 so as to converge the positive pole tab 21 by utilizing the first through hole 41, and the negative pole tab 22 passes through the second through hole 42 so as to converge the negative pole tab 22 by utilizing the second through hole 42, so as to space the positive pole tab 21 and the negative pole tab 22, and at the same time limit the positions of the positive pole tab 21 and the negative pole tab 22, thereby reducing the possibility of contact between the positive pole tab 21 and the negative pole tab 22, and thereby reducing the risk of short circuit in the battery cell 1.

[0051] In addition, the first through hole 41 and the second through hole 42 are staggered in the second direction and / or the third direction, so that after the positive pole tab 21 and the negative pole tab 22 are converged, it is convenient to increase the width of the positive pole tab 21 and the negative pole tab 22 while reducing the possibility of contact between the positive pole tab 21 and the negative pole tab 22, thereby reducing the risk of short circuit of the battery cell 1, improving the current carrying capacity of the positive pole tab 21 and the negative pole tab 22, and improving the performance of the battery cell 1.

[0052] The positive electrode tab 21 is suitable for being electrically connected to the positive electrode post 31 fixed to the cover plate 60 , and the negative electrode tab 22 is suitable for being electrically connected to the negative electrode post 32 fixed to the cover plate 60 , so as to output current to the outside through the positive electrode post 31 and the negative electrode post 32 .

[0053] According to the battery cell 1 of the embodiment of the present invention, the positive pole tab 21 is converged by the first through hole 41, and the negative pole tab 22 is converged by the second through hole 42, so that the positive pole tab 21 and the negative pole tab 22 are spaced apart, and the positions of the positive pole tab 21 and the negative pole tab 22 are limited at the same time, so as to reduce the possibility of contact between the positive pole tab 21 and the negative pole tab 22 while increasing the width of the positive pole tab 21 and the negative pole tab 22, thereby reducing the risk of short circuit in the battery cell 1 and improving the current carrying capacity of the positive pole tab 21 and the negative pole tab 22.

[0054] The following describes a battery cell 1 according to a specific embodiment of the present invention with reference to the accompanying drawings.

[0055] In some specific embodiments of the present invention, Figure 1-Figure 4 As shown, the battery cell 1 includes a housing 10 , a pole core 20 , a cover plate 60 and a first insulating member 40 .

[0056] In some embodiments of the present invention, at least one of the positive electrode column 31 and the negative electrode column 32 is insulated from the cover plate 60 to avoid backflow between the positive electrode column 31, the cover plate 60 and the negative electrode column 32, thereby preventing the battery cell 1 from short-circuiting.

[0057] Specifically, the cover plate 60 is provided with a first through hole and a second through hole, the positive pole 31 is passed through the first through hole, a first insulating member is provided between the inner wall of the first through hole and the positive pole 31, so as to insulate and separate the positive pole 31 from the cover plate. The negative pole 32 is passed through the second through hole, a second insulating member is provided between the inner wall of the second through hole and the negative pole 32, so as to insulate and separate the negative pole 32 from the cover plate.

[0058] In addition, the battery cell 1 also includes an insulating spacer, which is arranged between the cover plate 60 and the positive electrode tab 21 and the negative electrode tab 22. The positive electrode column 31 passes through the first through hole and the insulating spacer to be electrically connected to the positive electrode tab 21, and the negative electrode column 32 passes through the second through hole and the insulating spacer to be electrically connected to the negative electrode tab 22.

[0059] In some optional embodiments of the present invention, in the second direction, the side walls of the first through hole 41 and the second through hole 42 facing each other are spaced apart in the second direction to separate the positive electrode tab 21 and the negative electrode tab 22 in the second direction, thereby avoiding contact between the positive electrode tab 21 and the negative electrode tab 22 and reducing the possibility of short circuit in the battery cell 1.

[0060] like Figure 5 As shown, in the present embodiment, the second direction extends in the up-down direction (it should be understood here that the above-mentioned direction limitation is only for the convenience of describing the accompanying drawings, and will not limit the actual setting position and direction of the battery cell 1), the first through hole 41 is located below the second through hole 42, and the upper side wall of the first through hole 41 and the lower side wall of the second through hole 42 are spaced apart in the up-down direction, so that after the positive pole tab 21 passes through the first through hole 41 and the negative pole tab 22 passes through the second through hole 42, the positive pole tab 21 is converged by the first through hole 41 and the negative pole tab 22 is converged by the second through hole 42, the upper end of the positive pole tab 21 can be spaced apart from the lower end of the negative pole tab 22 in the up-down direction, thereby avoiding contact between the positive pole tab 21 and the negative pole tab 22, and reducing the possibility of short circuit in the battery cell 1.

[0061] In some optional embodiments of the present invention, Figure 5 As shown, the first insulating member 40 is provided with an insulating separator 43 protruding from the first through hole 41, and the insulating separator 43 is located between the first through hole 41 and the second through hole 42 to further separate the positive electrode tab 21 and the negative electrode tab 22, thereby avoiding the possibility of contact between the positive electrode tab 21 and the negative electrode tab 22.

[0062] In some specific embodiments of the present invention, the second direction is the height direction of the battery cell 1 , the third direction is the thickness direction of the battery cell 1 , and the insulating separator 43 extends along the third direction.

[0063] like Figure 5 As shown, in this embodiment, the second direction extends in the up-down direction, and the third direction extends in the front-to-back direction. The positive pole tab 21 is located below the negative pole tab 22, and the insulating separator 43 separates the first insulating member 40 into two upper and lower parts. When the positive pole tab 21 is bent along the third direction and the negative pole tab 22 is bent along the third direction, the insulating separator 43 is located at the upper end of the positive pole tab 21 and the lower end of the negative pole tab 22 to avoid contact between the positive pole tab 21 and the negative pole tab 22, thereby reducing the possibility of a short circuit in the battery cell 1.

[0064] In addition, by providing the insulating separator 43 , the positions of the negative electrode tab 22 and the positive electrode tab 21 can be limited to prevent the negative electrode tab 22 and the positive electrode tab 21 from moving along the second direction.

[0065] In some embodiments of the present invention, Figure 6-Figure 8 As shown, part of the positive electrode tab 21 passing through the first through hole 41 is bent to form a positive electrode connection flange 211, so as to facilitate the electrical connection between the positive electrode connection flange 211 and the positive electrode column 31, and part of the negative electrode tab 22 passing through the second through hole 42 is bent to form a negative electrode connection flange 221, so as to facilitate the electrical connection between the negative electrode connection flange 221 and the negative electrode column 32, thereby facilitating the output of current to the outside using the positive electrode column 31 and the negative electrode column 32.

[0066] In some optional embodiments of the present invention, Figure 5 , Figure 6 As shown, the bending direction of the positive connection flange 211 is opposite to the bending direction of the negative connection flange 221, so that it is convenient to fully utilize the size of the battery cell 1 in the third direction, increase the area of ​​the positive connection flange 211, increase the area of ​​the negative connection flange 221, and improve the current carrying capacity of the positive electrode tab 21 and the negative electrode tab 22.

[0067] like Figure 6 , Figure 7 As shown, in this embodiment, the third direction extends along the front-to-back direction, the front side wall of the first through hole 41 is located in front of the front side wall of the second through hole 42, the positive electrode tab 21 passes through the first through hole 41, and the negative electrode tab 22 passes through the second through hole 42, so the positive electrode tab 21 is located in front of the negative electrode tab 22.

[0068] The positive electrode tab 21 is bent backward to form a positive electrode connection flange 211, and the negative electrode tab 22 is bent forward to form a negative electrode connection flange 221. This makes it easier to increase the length of the positive electrode connection flange 211 and the negative electrode connection flange 221 in the front-to-back direction, thereby increasing the current capacity of the positive electrode tab 21 and the negative electrode tab 22.

[0069] In some embodiments, the side walls of the first through hole 41 and the second through hole 42 facing each other are arranged at intervals in the second direction, so that when the positive electrode ear 21 and the negative electrode ear 22 are bent along the third direction to form the positive electrode connection flange 211 and the negative electrode connection flange 221, the positive electrode connection flange 211 and the negative electrode connection flange 221 can be avoided from overlapping, thereby avoiding contact between the positive electrode connection flange 211 and the negative electrode connection flange 221, thereby avoiding a short circuit in the battery cell 1.

[0070] The first through hole 41 and the second through hole 42 are staggered in the third direction, so that when the positive electrode ear 21 and the negative electrode ear 22 are bent along the third direction to form the positive electrode connection flange 211 and the negative electrode connection flange 221, it is convenient to increase the length of the positive electrode connection flange 211 and the negative electrode connection flange 221 along the third direction, thereby increasing the area of ​​the positive electrode connection flange 211 and the negative electrode connection flange 221 that can be used for welding, and improving the overcurrent strength of the positive electrode connection flange 211 and the negative electrode connection flange 221.

[0071] In some embodiments, the positive electrode connection flange 211 is formed by bending the positive electrode tab 21 once. The positive electrode connection flange 211 can also be formed by bending the positive electrode tab 21 twice or more times. For example, the positive electrode tab 21 is first bent backward and then bent forward.

[0072] The negative electrode connection flange 221 is formed by bending the negative electrode tab 22 once. The negative electrode connection flange 221 can also be formed by bending the negative electrode tab 22 twice or more times. For example, the negative electrode tab 22 is first bent forward and then bent backward.

[0073] In some embodiments of the present invention, Figure 3 As shown, the battery cell 1 also includes a first electrical connecting piece 51 and a second electrical connecting piece 52. The first electrical connecting piece 51 is electrically connected to the positive electrode tab 21 and the positive electrode column 31 respectively to electrically connect the positive electrode tab 21 and the positive electrode column 31. The second electrical connecting piece 52 is electrically connected to the negative electrode tab 22 and the negative electrode column 32 respectively to electrically connect the negative electrode tab 22 and the negative electrode column 32.

[0074] In some optional embodiments of the present invention, Fig. 9 As shown, the first electrical connecting sheet 51 includes a first connecting portion 511 and a second connecting portion 512, the second connecting portion 512 is located on one side of the first connecting portion 511 in the second direction, the first connecting portion 511 is electrically connected to the positive electrode tab 21, and the second connecting portion 512 is electrically connected to the positive electrode column 31, and the second electrical connecting sheet 52 includes a third connecting portion 521 and a fourth connecting portion 522, the fourth connecting portion 522 is located on one side of the third connecting portion 521 in the second direction, the third connecting portion 521 is electrically connected to the negative electrode tab 22, and the fourth connecting portion 522 is electrically connected to the negative electrode column 32.

[0075] In this way, the welding area between the first electrical connecting piece 51 and the positive electrode tab 21 and the welding area between the first electrical connecting piece 51 and the positive electrode column 31 can be different, avoiding the overlap of the welding areas between the positive electrode tab 21 and the positive electrode column 31 and the first electrical connecting piece 51, which affects the welding strength.

[0076] The same is achieved by making the welding area between the second electrical connecting piece 52 and the negative electrode tab 22 and the welding area between the second electrical connecting piece 52 and the negative electrode column 32 different, so as to avoid the welding area between the negative electrode tab 21 and the negative electrode column 32 and the second electrical connecting piece 52 overlapping and affecting the welding strength.

[0077] In some specific embodiments of the present invention, the first connection portion 511 and the third connection portion 521 are arranged at intervals in the third direction to make full use of the space, so as to increase the area of ​​the first connection portion 511 and the area of ​​the second connection portion 512, thereby enhancing the welding strength between the positive electrode tab 21 and the first connection portion 511, enhancing the welding strength between the negative electrode tab 22 and the third connection portion 521, and enhancing the overload capacity of the battery cell 1.

[0078] The second connection portion 512 and the fourth connection portion 522 are arranged at intervals in the second direction to fully utilize the space and space the positive electrode column 31 and the negative electrode column 32 , thereby facilitating reducing the possibility of a short circuit in the battery cell 1 .

[0079] In some specific embodiments of the present invention, in the second direction, the first connection portion 511 and the third connection portion 521 are spaced apart in the second direction toward each other's side walls, so that the welding area between the first connection portion 511 and the positive electrode tab 21 and the welding area between the third connection portion 521 and the negative electrode tab 22 are spaced apart in the second direction, thereby avoiding contact between the welding area between the first connection portion 511 and the positive electrode tab 21 and the welding area between the third connection portion 521 and the negative electrode tab 22, thereby reducing the risk of short circuit in the battery cell 1.

[0080] In some embodiments, Fig. 9 As shown, the second direction extends in the up-down direction, and the third direction extends in the front-to-back direction. The first electrical connecting sheet 51 is located below the second electrical connecting sheet 52. The first connecting portion 511 and the third connecting portion 521 both extend in the up-down direction and are spaced apart in the front-to-back direction. This makes it easy to fully utilize the space of the battery cell 1 in the second and third directions, and further makes it easy to set the area of ​​the first connecting portion 511 and the area of ​​the third connecting portion 521 larger, so as to enhance the welding strength between the first connecting portion 511 and the positive electrode tab 21, and enhance the welding strength between the third connecting portion 521 and the negative electrode tab 22.

[0081] In some examples, such as Fig. 9 As shown, in the second direction, the distance between the side walls of the first connection portion 511 and the third connection portion 521 close to each other is X, 4mm≤X, so as to meet the creepage distance requirements of UL60950, avoid the formation of an arc between the first connection portion 511 and the third connection portion 521, and avoid causing a short circuit in the battery cell 1.

[0082] What needs to be explained here is that creepage distance refers to the shortest distance between two conductive parts measured along the insulating surface.

[0083] In some examples, such as Fig. 9As shown, in the third direction, the distance between the side walls of the first connection portion 511 and the third connection portion 521 close to each other is Y, 1mm≤Y, so as to avoid short circuit between the first connection portion 511 and the third connection portion 521, and avoid short circuit caused by the staggered positive electrode tab 21 and the negative electrode tab 22 during welding.

[0084] In some examples, such as Fig. 9 As shown, the second connection portion 512 is located below the first connection portion 511, and the fourth connection portion 522 is located above the third connection portion 521, so that the second connection portion 512 and the fourth connection portion 522 are spaced apart in the up and down directions, thereby spaced apart the positive electrode column 31 and the negative electrode column 32 in the up and down directions.

[0085] In some embodiments, the battery cell 1 is a blade-type battery with double-sided poles. Since the electrolyte climbing height is limited, in order to avoid the risk of lithium precipitation due to insufficient electrolyte in the upper part of the battery elevator 1 when the battery cell 1 is working, the size of the battery cell 1 along the up and down directions cannot be too large, and the welding points between the pole and the electrical connecting piece, and the welding points between the pole ear and the electrical connecting piece cannot overlap. Overlapping will cause poor welding of the pole ear or the pole.

[0086] The second connection part 512 is located on one side of the first connection part 511 in the second direction, and the fourth connection part 522 is located on one side of the third connection part 521 in the second direction, so that the electrical connection sheet forms a region for welding the pole and the pole ear separately to avoid the pole ear from having a cold weld.

[0087] In some specific embodiments of the present invention, the central axis of the positive electrode column 31 and the central axis of the negative electrode column 32 are spaced in the second direction and the third direction, respectively, so as to make full use of the space in the second direction and the third direction, and thereby set the distance between the positive electrode column 31 and the negative electrode column 32 farther, so as to reduce the possibility of short circuit in the battery cell 1.

[0088] In other specific embodiments of the present invention, Fig. 9 As shown, the central axis of the positive electrode column 31 and the central axis of the negative electrode column 32 are directly opposite in the second direction.

[0089] In some optional embodiments of the present invention, Figure 3 As shown, the battery cell 1 also includes a second insulating member 65, which is located between the first electrical connecting sheet 51 and the cover plate 60 to separate the first electrical connecting sheet 51 and the cover plate 60 to avoid electrical contact between the first electrical connecting sheet 51 and the cover plate 60, and to separate the second electrical connecting sheet 52 and the cover plate 60 to avoid electrical contact between the second electrical connecting sheet 52 and the cover plate 60.

[0090] In some embodiments of the present invention, the pole core 20 is provided with a positive pole ear 21 and a negative pole ear 22 at both ends of the first direction, so that the pole core 20 can transmit electricity from both ends of the first direction, thereby reducing the flow path of electrons in the pole core 20, thereby reducing the impedance of electrons during the flow process, and improving the charging and discharging efficiency of the battery cell 1.

[0091] In some optional embodiments of the present invention, Figure 1 As shown, the pole core 20 is provided with a first positive pole tab and a first negative pole tab at one end in the first direction, and is provided with a second positive pole tab and a second negative pole tab at the other end in the first direction.

[0092] Correspondingly, the battery cell 1 includes a first positive electrode column and a first negative electrode column, a second positive electrode column and a second negative electrode column, the first positive electrode column is electrically connected to the first positive electrode tab, the first negative electrode column is electrically connected to the first negative electrode tab, the second positive electrode column is electrically connected to the second positive electrode tab, and the second negative electrode column is electrically connected to the second negative electrode tab.

[0093] The battery cell 1 can transmit electricity to the outside through the two positive poles 31 and the two negative poles 32 together, or transmit electricity to the outside through one pair and keep the other pair as a backup.

[0094] In some embodiments, the first positive electrode column and the first negative electrode column are opposite to each other along the first direction, and the second positive electrode column and the second negative electrode column are opposite to each other along the first direction.

[0095] In other embodiments, the first positive electrode column and the second positive electrode column are opposite to each other along the first direction, and the first negative electrode column and the second negative electrode column are opposite to each other along the first direction.

[0096] In some embodiments of the present invention, the battery cell 1 includes at least one explosion-proof valve 68, which is arranged on one side of the battery cell 1 in a first direction. When thermal runaway occurs in the battery cell 1, the explosion-proof valve 68 is used to release pressure to improve the safety of the battery cell 1.

[0097] In some examples, the battery cell 1 includes two explosion-proof valves 68 , and the two explosion-proof valves 68 are respectively disposed on both sides of the battery cell 1 in the first direction.

[0098] In some embodiments of the present invention, the battery cell 1 includes at least one liquid injection hole.

[0099] In some embodiments, the battery cell 1 includes two injection holes, which are used to replenish electrolyte into the battery cell 1 , and the two injection holes are respectively disposed on both sides of the battery cell 1 in the first direction.

[0100] The battery pack according to the embodiment of the present invention is described below. The battery pack according to the embodiment of the present invention includes the battery cell 1 according to the above embodiment of the present invention.

[0101] According to the battery pack of the embodiment of the present invention, by utilizing the battery cell 1 according to the above-mentioned embodiment of the present invention, the positive pole tab 21 is converged by utilizing the first through hole 41, and the negative pole tab 22 is converged by utilizing the second through hole 42, so that the positive pole tab 21 and the negative pole tab 22 are spaced apart, and at the same time, the positions of the positive pole tab 21 and the negative pole tab 22 are limited, so as to reduce the possibility of contact between the positive pole tab 21 and the negative pole tab 22 while increasing the width of the positive pole tab 21 and the negative pole tab 22, thereby reducing the risk of short circuit of the battery cell 1 and improving the current carrying capacity of the positive pole tab 21 and the negative pole tab 22.

[0102] In some embodiments, Fig.10 , Fig.11 As shown, the battery pack includes a plurality of battery cells 1 and a power connection plate 70, wherein the plurality of battery cells 1 are arranged in a third direction, and the pole core 20 is provided with a first positive pole tab and a first negative pole tab at one end in the first direction, and a second positive pole tab and a second negative pole tab at the other end in the first direction.

[0103] Correspondingly, the battery cell 1 includes a first positive electrode column and a first negative electrode column, a second positive electrode column and a second negative electrode column, and the connecting plate 70 connects the positive electrode column 31 and the negative electrode column 32 of two adjacent battery cells 1 to connect multiple battery cells 1 in series, so that multiple battery cells 1 can be discharged from both ends of the battery pack in the first direction, reducing the flow path of electrons, thereby reducing the impedance of electrons during the flow process, and improving the charging and discharging efficiency of the battery cell 1.

[0104] The following describes an electric device according to an embodiment of the present invention. The electric device according to an embodiment of the present invention includes a battery pack according to the above embodiment of the present invention.

[0105] According to the electrical device of the embodiment of the present invention, by utilizing the battery pack according to the above-mentioned embodiment of the present invention, the positive pole tab 21 is converged by utilizing the first through hole 41, and the negative pole tab 22 is converged by utilizing the second through hole 42, so that the positive pole tab 21 and the negative pole tab 22 are spaced apart, and at the same time, the positions of the positive pole tab 21 and the negative pole tab 22 are limited, so as to reduce the possibility of contact between the positive pole tab 21 and the negative pole tab 22 while increasing the width of the positive pole tab 21 and the negative pole tab 22, thereby reducing the risk of short circuit of the battery cell 1 and improving the current carrying capacity of the positive pole tab 21 and the negative pole tab 22.

[0106] Other structures and operations of the electric device according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0107] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature between them.

[0108] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0109] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0110] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0111] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: A housing (10), wherein the housing (10) has an open opening (11) in a first direction; A pole core (20), wherein in the first direction, the same end of the pole core (20) has a positive pole tab (21) and a negative pole tab (22); A cover plate (60), the cover plate (60) being arranged to cover the open opening (11); a first insulating member (40), the first insulating member (40) being located between the pole core (20) and the cover plate (60), the first insulating member (40) being provided with a first through hole (41) and a second through hole (42), the first through hole (41) and the second through hole (42) being staggered in a second direction and / or a third direction, the first direction, the second direction and the third direction being perpendicular to each other, The positive electrode tab (21) passes through the first through hole (41) and is suitable for being electrically connected to the positive electrode column (31) fixed on the cover plate (60), and the negative electrode tab (22) passes through the second through hole (42) and is suitable for being electrically connected to the negative electrode column (32) fixed on the cover plate (60).

2. The battery cell according to claim 1, characterized in that: In the second direction, the side walls of the first through hole (41) and the second through hole (42) facing each other are arranged at intervals in the second direction.

3. The battery cell according to claim 1, characterized in that: An insulating spacer (43) protruding from the first through hole (41) is provided on the first insulating member (40); the insulating spacer (43) is located between the first through hole (41) and the second through hole (42).

4. The battery cell according to claim 3, characterized in that: The second direction is the height direction of the battery cell (1), the third direction is the thickness direction of the battery cell (1), and the insulating separator (43) extends along the third direction.

5. The battery cell according to claim 1, characterized in that: The portion of the positive electrode tab (21) passing through the first through hole (41) is bent to form a positive electrode connection flange (211), and the portion of the negative electrode tab (22) passing through the second through hole (42) is bent to form a negative electrode connection flange (221).

6. The battery cell according to claim 5, characterized in that: The bending direction of the positive electrode connection flange (211) is opposite to the bending direction of the negative electrode connection flange (221).

7. The battery cell according to any one of claims 1 to 6, characterized in that: It also includes a first electrical connection sheet (51) and a second electrical connection sheet (52), wherein the first electrical connection sheet (51) is electrically connected to the positive electrode tab (21) and the positive electrode column (31) respectively, and the second electrical connection sheet (52) is electrically connected to the negative electrode tab (22) and the negative electrode column (32) respectively.

8. The battery cell according to claim 7, characterized in that: The first electrical connecting piece (51) comprises a first connecting portion (511) and a second connecting portion (512), the second connecting portion (512) being located on one side of the first connecting portion (511) in the second direction, the first connecting portion (511) being electrically connected to the positive electrode tab (21), and the second connecting portion (512) being electrically connected to the positive electrode column (31); The second electrical connecting piece (52) comprises a third connecting portion (521) and a fourth connecting portion (522), wherein the fourth connecting portion (522) is located on one side of the third connecting portion (521) in the second direction, the third connecting portion (521) is electrically connected to the negative electrode tab (22), and the fourth connecting portion (522) is electrically connected to the negative electrode column (32).

9. The battery cell according to claim 8, characterized in that: The first connection portion (511) and the third connection portion (521) are arranged at intervals in the third direction, and the second connection portion (512) and the fourth connection portion (522) are arranged at intervals in the second direction.

10. The battery cell according to claim 9, characterized in that: In the second direction, the side walls of the first connection portion (511) and the third connection portion (521) facing each other are arranged at intervals in the second direction.

11. The battery cell according to claim 10, characterized in that: In the second direction, the distance between the side walls of the first connection portion (511) and the third connection portion (521) facing each other is X, where 4 mm ≤ X; And\or, in the third direction, the distance between the side walls of the first connection portion (511) and the third connection portion (521) facing each other is Y, where 1mm≤Y.

12. The battery cell according to claim 9, characterized in that: It also includes a second insulating member (65), wherein the second insulating member (65) is located between the first electrical connection sheet (51) and the cover plate (60), and between the second electrical connection sheet (52) and the cover plate (60).

13. The battery cell according to any one of claims 1 to 6, characterized in that: The pole core (20) is provided with the positive pole tab (21) and the negative pole tab (22) at two ends in the first direction, respectively.

14. A battery pack, characterized in that: The invention comprises a plurality of battery cells (1) according to any one of claims 1 to 13.

15. An electrical device, characterized in that: A battery pack comprising the battery pack of claim 14.

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