Battery cell and battery pack having the same, electric device

Abstract

The application discloses a battery monomer and a battery pack and an electric device with the same, the battery monomer comprising: a pole core, the same end of the pole core having a positive pole lug and a negative pole lug in a first direction; a first insulation piece, the first insulation piece being provided with a first through hole and a second through hole, the first through hole and the second through hole being arranged 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 pole lug penetrating through the first through hole and being adapted to be electrically connected with a positive pole post fixed on a cover plate, and the negative pole lug penetrating through the second through hole and being adapted to be electrically connected with a negative pole post fixed on the cover plate. According to the battery monomer of the embodiment of the application, the positive pole lug is bundled by the first through hole, and the negative pole lug is bundled by the second through hole, so that the positive pole lug and the negative pole lug are spaced, the positions of the positive pole lug and the negative pole lug are limited, the possibility of the positive pole lug and the negative pole lug being in contact is reduced, and the risk of short circuit of the battery monomer is reduced.

Description

Technical Field

[0001] This invention relates to the field of battery cell technology, and more specifically, to a battery cell and a battery pack and electrical device having the same. Background Technology

[0002] In related technologies, both the positive and negative terminals are located on the same side of the battery cell. Due to limited space, the cell is prone to internal short circuits when a high-voltage arc is generated. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a battery cell that uses a first through-hole to converge the positive electrode tab and a second through-hole to converge the negative electrode tab, thereby spacing the positive and negative electrode tabs and restricting their positions. This increases the width of the positive and negative electrode tabs while reducing the possibility of them contacting each other, thus reducing the risk of short circuits in the battery cell and improving the overcurrent capacity of the positive and negative electrode tabs.

[0004] The present invention also proposes a battery pack having the aforementioned battery cells.

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

[0006] A battery cell according to a first aspect of the present invention includes: a housing having an opening in a first direction; an electrode core having a positive electrode tab and a negative electrode tab at the same end in the first direction; a cover plate covering the opening; a first insulating member located between the electrode core and the cover plate, the first insulating member having a first through hole and a second through hole, the first through hole and the second through hole being offset 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 electrode tab passes through the first through hole and is adapted to be electrically connected to a positive electrode post fixed to the cover plate, and the negative electrode tab passes through the second through hole and is adapted to be electrically connected to the negative electrode tab fixed to the cover plate.

[0007] According to an embodiment of the present invention, the positive electrode tab is gathered using a first through hole and the negative electrode tab is gathered using a second through hole, so that the positive electrode tab and the negative electrode tab are spaced apart, while restricting the position of the positive electrode tab and the negative electrode tab. This increases the width of the positive electrode tab and the negative electrode tab, while reducing the possibility of the positive electrode tab and the negative electrode tab coming into contact, thereby reducing the risk of short circuit in the battery cell and improving the overcurrent capacity of the positive electrode tab and the negative electrode tab.

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

[0009] According to some alternative embodiments of the present invention, in the second direction, the sidewalls 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, the first insulating member is provided with an insulating separator protruding from the first through hole, the insulating separator being 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 the height direction of the battery cell, the third direction is the thickness direction of the battery cell, and the insulating separator extends along the third direction.

[0012] According to some alternative 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 includes a first electrical connection piece and a second electrical connection piece, wherein the first electrical connection piece is electrically connected to the positive electrode tab and the positive electrode post respectively, and the second electrical connection piece is electrically connected to the negative electrode tab and the negative electrode post respectively.

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

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

[0017] According to some alternative embodiments of the present invention, in the second direction, the sidewalls of the first connecting portion and the third connecting portion facing each other are spaced apart in the second direction.

[0018] According to some specific embodiments of the present invention, in the second direction, the distance between the sidewalls of the first connecting portion and the third connecting portion facing each other is X, wherein 4mm≤X; and / or, in the third direction, the distance between the sidewalls of the first connecting portion and the third connecting 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 located between the first electrical connecting piece and the cover plate, and between the second electrical connecting piece and the cover plate.

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

[0021] According to a second aspect of the present invention, a battery pack is provided, the battery pack comprising the battery cells described in the first aspect of the present invention.

[0022] According to the battery pack of the present invention, by utilizing the battery cell described in the first aspect of the present invention, the positive electrode tab is gathered by a first through hole and the negative electrode tab is gathered by a second through hole, 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 restricted. This increases the width of the positive electrode tab and the negative electrode tab while reducing the possibility of the positive electrode tab and the negative electrode tab coming into contact, thereby reducing the risk of short circuit in the battery cell and improving the overcurrent capacity of the positive electrode tab and the negative electrode tab.

[0023] According to a third aspect of the present invention, an electrical device is provided, the electrical device comprising a battery pack as described in a second aspect of the present invention.

[0024] According to an embodiment of the present invention, the electrical device utilizes a battery pack as described in the second aspect of the present invention, where a first through-hole is used to gather the positive electrode tab and a second through-hole is used to gather the negative electrode tab, thereby spacing the positive and negative electrode tabs apart and restricting their positions. This increases the width of the positive and negative electrode tabs while reducing the possibility of them contacting each other, thereby reducing the risk of short circuits in individual battery cells and improving the overcurrent capacity of the positive and negative electrode tabs.

[0025] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

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

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

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

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

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

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

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

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

[0034] Figure 8 This is a cross-sectional view of a battery cell according to other embodiments of the present invention;

[0035] Figure 9 This is a schematic diagram of the structure of the second insulating member, the first electrical connecting piece, and the second electrical connecting piece according to an embodiment of the present invention;

[0036] Figure 10 This is a schematic diagram of the structure of multiple battery cells and contact plates according to an embodiment of the present invention;

[0037] Figure 11 This is a front view of multiple battery cells and contact plates according to an embodiment of the present invention.

[0038] Reference numerals: 1. Individual battery cell;

[0039] 10. Shell; 11. Opening;

[0040] 20. Electrode core; 21. Positive electrode tab; 211. Positive electrode connection flange; 22. Negative electrode tab; 221. Negative electrode connection flange;

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

[0042] 40. First insulating component; 41. First through hole; 42. Second through hole; 43. Insulating separator;

[0043] 51. First electrical connector; 511. First connecting part; 512. Second connecting part; 52. Second electrical connector; 521. Third connecting part; 522. Fourth connecting part;

[0044] 60. Cover plate; 65. Second insulating component; 68. Explosion-proof valve; 70. Electrical contact plate. Detailed Implementation

[0045] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

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

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

[0048] The housing 10 has an opening 11 in a first direction. In the first direction, the same end of the electrode core 20 has a positive electrode tab 21 and a negative electrode tab 22. A cover plate 60 is provided over the opening 11 to protect the electrode core 20 using the cover plate 60 and the housing 10.

[0049] The first insulating element 40 is located between the electrode core 20 and the cover plate 60 to separate the cover plate 60 and the electrode core 20, prevent the electrode core 20 from making electrical contact with the cover plate 60, prevent the current on the electrode core 20 from flowing to the cover plate 60, and thus prevent leakage of the battery cell 1.

[0050] The first insulating member 40 is provided with a first through hole 41 and a second through hole 42. The first through hole 41 and the second through hole 42 are offset in a second direction and / or a third direction. The first direction, the second direction and the third direction are perpendicular to each other. The positive electrode tab 21 passes through the first through hole 41 to bind the positive electrode tab 21. The negative electrode tab 22 passes through the second through hole 42 to bind the negative electrode tab 22. This makes the positive electrode tab 21 and the negative electrode tab 22 spaced apart, while restricting the position of the positive electrode tab 21 and the negative electrode tab 22, reducing the possibility of the positive electrode tab 21 and the negative electrode tab 22 coming into contact, thereby reducing the risk of short circuit in the battery cell 1.

[0051] Furthermore, by staggering the first through hole 41 and the second through hole 42 in the second direction and / or third direction, after the positive electrode tab 21 and the negative electrode tab 22 are bundled together, it is convenient to increase the width of the positive electrode tab 21 and the negative electrode tab 22 while reducing the possibility of the positive electrode tab 21 and the negative electrode tab 22 coming into contact, thereby reducing the risk of short circuit in the battery cell 1, improving the overcurrent capacity of the positive electrode tab 21 and the negative electrode tab 22, and improving the performance of the battery cell 1.

[0052] The positive electrode tab 21 is adapted to be electrically connected to the positive electrode post 31 fixed to the cover plate 60, and the negative electrode tab 22 is adapted to be 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 an embodiment of the present invention, the battery cell 1 uses a first through hole 41 to converge the positive electrode tab 21 and a second through hole 42 to converge the negative electrode tab 22, so that the positive electrode tab 21 and the negative electrode tab 22 are spaced apart, while restricting the position of the positive electrode tab 21 and the negative electrode tab 22. This increases the width of the positive electrode tab 21 and the negative electrode tab 22, while reducing the possibility of the positive electrode tab 21 and the negative electrode tab 22 coming into contact, thereby reducing the risk of short circuit in the battery cell 1 and improving the overcurrent capacity of the positive electrode tab 21 and the negative electrode tab 22.

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

[0055] In some specific embodiments of the present invention, such as Figures 1-4 As shown, the battery cell 1 includes a housing 10, an electrode core 20, a cover plate 60, and a first insulating component 40.

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

[0057] Specifically, the cover plate 60 has a first through hole and a second through hole. The positive electrode post 31 passes through the first through hole, and a first insulating element is provided between the inner wall of the first through hole and the positive electrode post 31 to insulate and separate the positive electrode post 31 from the cover plate. The negative electrode post 32 passes through the second through hole, and a second insulating element is provided between the inner wall of the second through hole and the negative electrode post 32 to insulate and separate the negative electrode post 32 from the cover plate.

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

[0059] In some alternative embodiments of the present invention, in the second direction, the sidewalls of the first through hole 41 and the second through hole 42 facing each other are arranged at intervals in the second direction to separate the positive electrode tab 21 and the negative electrode tab 22 in the second direction, thereby preventing the positive electrode tab 21 from contacting the negative electrode tab 22 and reducing the possibility of short circuit in the battery cell 1.

[0060] like Figure 5 As shown, in this embodiment, the second direction extends vertically (it should be understood that the above direction limitation is only for the convenience of describing the drawings and does 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. The upper sidewall of the first through hole 41 and the lower sidewall of the second through hole 42 are spaced apart in the vertical direction. In this way, when 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, the positive electrode tab 21 is gathered by the first through hole 41 and the negative electrode tab 22 is gathered by the second through hole 42. This allows the upper end of the positive electrode tab 21 and the lower end of the negative electrode tab 22 to be spaced apart in the vertical direction, thereby preventing the positive electrode tab 21 and the negative electrode tab 22 from contacting each other and reducing the possibility of short circuit in the battery cell 1.

[0061] In some alternative embodiments of the present invention, such as Figure 5 As shown, the first insulating member 40 is provided with an insulating separator 43 protruding from the first through hole 41. 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 the positive electrode tab 21 and the negative electrode tab 22 coming into contact.

[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 along the vertical direction, and the third direction extends along the front-back direction. The positive electrode tab 21 is located below the negative electrode tab 22. The insulating separator 43 divides the first insulating member 40 into upper and lower parts. When the positive electrode tab 21 is bent along the third direction and the negative electrode tab 22 is bent along the third direction, the insulating separator 43 is located at the upper end of the positive electrode tab 21 and the lower end of the negative electrode tab 22 to avoid the positive electrode tab 21 from contacting the negative electrode tab 22, thereby reducing the possibility of 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, preventing the negative electrode tab 22 and the positive electrode tab 21 from shifting along the second direction.

[0065] In some embodiments of the present invention, such as Figures 6-8 As shown, the positive electrode tab 21 passing through the first through hole 41 is bent to form a positive connection flange 211, so as to facilitate the positive connection flange 211 to be electrically connected to the positive electrode post 31. The negative electrode tab 22 passing through the second through hole 42 is bent to form a negative connection flange 221, so as to facilitate the negative connection flange 221 to be electrically connected to the negative electrode post 32, thereby facilitating the output of current using the positive electrode post 31 and the negative electrode post 32.

[0066] In some alternative embodiments of the present invention, such as Figure 5 , Figure 6 As shown, the bending direction of the positive electrode connection flange 211 is opposite to that of the negative electrode connection flange 221. This makes it easier to make full use of the dimensions of the battery cell 1 in the third direction, increase the area of ​​the positive electrode connection flange 211, increase the area of ​​the negative electrode 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 in the front-back direction, the front sidewall of the first through hole 41 is located in front of the front sidewall 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. Therefore, 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-back direction, thereby making it easier to increase the current carrying capacity of the positive electrode tab 21 and the negative electrode tab 22.

[0069] In some embodiments, the sidewalls of the first through hole 41 and the second through hole 42 facing each other are arranged at intervals in the second direction. This prevents the positive electrode tab 21 and the negative electrode tab 22 from overlapping when the positive electrode tab 21 and the negative electrode tab 221 are bent along the third direction to form the positive electrode connection flange 211 and the negative electrode connection flange 221, thereby preventing the positive electrode connection flange 211 and the negative electrode connection flange 221 from contacting each other and preventing the battery cell 1 from short-circuiting.

[0070] The first through hole 41 and the second through hole 42 are offset in the third direction. This makes it easier to increase the length of the positive electrode tab 211 and the negative electrode tab 221 in the third direction when the positive electrode tab 211 and the negative electrode tab 221 are bent in the third direction to form the positive electrode connection flange 211 and the negative electrode connection flange 221. This increases the area of ​​the positive electrode connection flange 211 and the negative electrode connection flange 221 that can be used for welding, and improves the current carrying capacity 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. 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. For example, the negative electrode tab 22 is first bent forward and then bent backward.

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

[0074] In some alternative embodiments of the present invention, such as Figure 9 As shown, the first electrical connector 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 post 31. The second electrical connector 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 post 32.

[0075] This ensures that the welding areas of the first electrical connector 51 and the positive electrode tab 21, and the welding areas of the first electrical connector 51 and the positive electrode post 31 are different, thus avoiding overlap between the welding areas of the positive electrode tab 21 and the positive electrode post 31 and the first electrical connector 51, which would affect the welding strength.

[0076] Similarly, this ensures that the welding areas of the second electrical connector 52 and the negative electrode tab 22, and the welding areas of the second electrical connector 52 and the negative electrode post 32 are different, thus avoiding overlap between the welding areas of the negative electrode tab 21 and the negative electrode post 32 and the second electrical connector 52, which would affect the welding strength.

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

[0078] The second connecting portion 512 and the fourth connecting portion 522 are arranged at intervals in the second direction to make full use of the space, so that the positive terminal 31 and the negative terminal 32 are spaced apart, thereby reducing the possibility of short circuit in the battery cell 1.

[0079] In some specific embodiments of the present invention, in the second direction, the sidewalls of the first connecting portion 511 and the third connecting portion 521 facing each other are arranged at a distance in the second direction, so that the welding area of ​​the first connecting portion 511 and the positive electrode tab 21, and the welding area of ​​the third connecting portion 521 and the negative electrode tab 22 are spaced apart in the second direction, thereby avoiding contact between the welding area of ​​the first connecting portion 511 and the positive electrode tab 21, and the welding area of ​​the third connecting portion 521 and the negative electrode tab 22, and reducing the risk of short circuit of the battery cell 1.

[0080] In some embodiments, such as Figure 9 As shown, the second direction extends vertically, and the third direction extends forward and backward. The first electrical connector 51 is located below the second electrical connector 52. The first connecting portion 511 and the third connecting portion 521 both extend vertically and are spaced apart in the forward and backward direction. This makes it easier to make full use of the space of the battery cell 1 in the second and third directions, and thus makes it easier to set the area of ​​the first connecting portion 511 and the area of ​​the third connecting portion 521 to be larger, so as to enhance the welding strength of the first connecting portion 511 and the positive electrode tab 21, and enhance the welding strength of the third connecting portion 521 and the negative electrode tab 22.

[0081] In some examples, such as Figure 9 As shown, in the second direction, the distance between the sidewalls of the first connecting part 511 and the third connecting part 521 that are close to each other is X, 4mm≤X, in order to meet the creepage distance requirements of UL60950, avoid the formation of an electric arc between the first connecting part 511 and the third connecting part 521, and avoid causing a short circuit in the battery cell 1.

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

[0083] In some examples, such as Figure 9As shown, in the third direction, the distance between the sidewalls of the first connecting part 511 and the third connecting part 521 that are close to each other is Y, 1mm≤Y, so as to avoid short circuit between the first connecting part 511 and the third connecting part 521 and to avoid short circuit caused by the positive electrode tab 21 and the negative electrode tab 22 being crossed during welding.

[0084] In some examples, such as Figure 9 As shown, the second connecting part 512 is located below the first connecting part 511, and the fourth connecting part 522 is located above the third connecting part 521, so that the second connecting part 512 and the fourth connecting part 522 are spaced apart in the vertical direction, thereby making the positive electrode post 31 and the negative electrode post 32 spaced apart in the vertical direction.

[0085] In some embodiments, the battery cell 1 is a blade-type battery with terminals on both sides. Due to the limited electrolyte creep height, in order to avoid the risk of lithium plating caused by insufficient electrolyte in the upper part of the battery elevator 1 during operation, the size of the battery cell 1 in the vertical direction cannot be too large. The welding points of the terminals and the electrical connectors, and the welding points of the tabs and the electrical connectors cannot overlap, as overlap will lead to poor soldering of the tabs or terminals.

[0086] The second connecting part 512 is located on one side of the first connecting part 511 in the second direction, and the fourth connecting part 522 is located on one side of the third connecting part 521 in the second direction, so that the electrical connecting piece forms an area for separately welding the electrode post and the electrode tab, avoiding the electrode tab from being poorly soldered.

[0087] In some specific embodiments of the present invention, the central axis of the positive electrode post 31 and the central axis of the negative electrode post 32 are spaced apart 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, thereby setting the distance between the positive electrode post 31 and the negative electrode post 32 to be relatively far, which helps to reduce the possibility of short circuit in the battery cell 1.

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

[0089] In some alternative embodiments of the present invention, such as Figure 3 As shown, the battery cell 1 also includes a second insulating member 65, which is located between the first electrical connecting piece 51 and the cover plate 60 to separate the first electrical connecting piece 51 and the cover plate 60 and prevent them from making electrical contact, and to separate the second electrical connecting piece 52 and the cover plate 60 and prevent them from making electrical contact.

[0090] In some embodiments of the present invention, the electrode core 20 is provided with a positive electrode tab 21 and a negative electrode tab 22 at both ends in the first direction, so that the electrode core 20 can transmit power from both ends in the first direction. This facilitates reducing the flow path of electrons in the electrode 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, such as Figure 1 As shown, the electrode core 20 is provided with a first positive electrode tab and a first negative electrode tab at one end in the first direction, and a second positive electrode tab and a second negative electrode tab at the other end in the first direction.

[0092] Accordingly, the battery cell 1 includes a first positive terminal and a first negative terminal, a second positive terminal and a second negative terminal, the first positive terminal being electrically connected to the first positive terminal tab, the first negative terminal being electrically connected to the first negative terminal tab, the second positive terminal being electrically connected to the second positive terminal tab, and the second negative terminal being electrically connected to the second negative terminal tab.

[0093] Among them, the battery cell 1 can transmit power to the outside through two positive terminals 31 and two negative terminals 32 together, or it can transmit power to the outside through one pair and keep the other pair as a backup.

[0094] In some embodiments, the first positive terminal and the first negative terminal are directly opposite each other along a first direction, and the second positive terminal and the second negative terminal are directly opposite each other along a first direction.

[0095] In other embodiments, the first positive terminal and the second positive terminal are directly opposite each other along a first direction, and the first negative terminal and the second negative terminal are directly opposite each other along a first direction.

[0096] In some embodiments of the present invention, the battery cell 1 includes at least one explosion-proof valve 68, which is disposed on one side of the battery cell 1 in a first direction. When the battery cell 1 experiences thermal runaway, 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, which are respectively located 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 for replenishing electrolyte into the battery cell 1, and the two injection holes are respectively located on both sides of the battery cell 1 in a first direction.

[0100] The following describes a battery pack according to an embodiment of the present invention. The battery pack according to an embodiment of the present invention includes a battery cell 1 according to the above-described embodiment.

[0101] According to the battery pack of the present invention, by using the battery cell 1 of the present invention described above, the positive electrode tab 21 is gathered by the first through hole 41 and the negative electrode tab 22 is gathered by the second through hole 42, so that the positive electrode tab 21 and the negative electrode tab 22 are spaced apart, and the positions of the positive electrode tab 21 and the negative electrode tab 22 are restricted. In order to increase the width of the positive electrode tab 21 and the negative electrode tab 22, the possibility of the positive electrode tab 21 and the negative electrode tab 22 coming into contact is reduced, thereby reducing the risk of short circuit of the battery cell 1 and improving the overcurrent capacity of the positive electrode tab 21 and the negative electrode tab 22.

[0102] In some embodiments, such as Figure 10 , Figure 11 As shown, the battery pack includes multiple battery cells 1 and a contact plate 70. The multiple battery cells 1 are arranged in a third direction. The electrode core 20 is provided with a first positive electrode tab and a first negative electrode tab at one end in the first direction, and a second positive electrode tab and a second negative electrode tab at the other end in the first direction.

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

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

[0105] According to an embodiment of the present invention, the electrical device utilizes a battery pack according to the above embodiment of the present invention to gather the positive electrode tab 21 using a first through hole 41 and to gather the negative electrode tab 22 using a second through hole 42, thereby spacing the positive electrode tab 21 and the negative electrode tab 22 apart and restricting the position of the positive electrode tab 21 and the negative electrode tab 22. This increases the width of the positive electrode tab 21 and the negative electrode tab 22 while reducing the possibility of the positive electrode tab 21 and the negative electrode tab 22 coming into contact, thereby reducing the risk of short circuit in the battery cell 1 and improving the overcurrent capacity of the positive electrode tab 21 and the negative electrode tab 22.

[0106] Other configurations and operations of the electrical device according to embodiments 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 this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, "above" or "below" a second feature may include direct contact between the first and second features, or it may include contact between the first and second features not being in direct contact but through another feature between them.

[0108] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0109] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0110] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

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

Claims

1. A battery cell, characterized in that, include: The housing (10) has an opening (11) in a first direction; The electrode core (20) has a positive electrode tab (21) and a negative electrode tab (22) at the same end in the first direction. Cover plate (60) covering the opening (11); A first insulating element (40) is located between the pole core (20) and the cover plate (60). The first insulating element (40) has a first through hole (41) and a second through hole (42). The first through hole (41) and the second through hole (42) are offset in a second direction and a third direction, respectively. The first direction, the second direction, and the third direction are perpendicular to each other. The positive electrode tab (21) passes through the first through hole (41) and is adapted to be electrically connected to the positive electrode post (31) fixed on the cover plate (60), and the negative electrode tab (22) passes through the second through hole (42) and is adapted to be electrically connected to the negative electrode post (32) fixed on the cover plate (60).

2. The battery cell according to claim 1, characterized in that, In the second direction, the sidewalls 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, 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).

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 that of the negative electrode connection flange (221).

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

8. The battery cell according to claim 7, characterized in that, The first electrical connector (51) includes a first connecting part (511) and a second connecting part (512). The second connecting part (512) is located on one side of the first connecting part (511) in the second direction. The first connecting part (511) is electrically connected to the positive electrode tab (21), and the second connecting part (512) is electrically connected to the positive electrode post (31). The second electrical connector (52) includes a third connector (521) and a fourth connector (522). The fourth connector (522) is located on one side of the third connector (521) in the second direction. The third connector (521) is electrically connected to the negative electrode tab (22), and the fourth connector (522) is electrically connected to the negative electrode post (32).

9. The battery cell according to claim 8, characterized in that, The first connecting portion (511) and the third connecting portion (521) are arranged at intervals in the third direction, and the second connecting portion (512) and the fourth connecting 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 first connecting portion (511) and the third connecting portion (521) are arranged at intervals along their sidewalls facing each other in the second direction.

11. The battery cell according to claim 10, characterized in that, In the second direction, the distance between the sidewalls of the first connecting part (511) and the third connecting part (521) facing each other is X, where 4mm≤X; Or, in the third direction, the distance between the sidewalls of the first connecting part (511) and the third connecting part (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 element (65) located between the first electrical connecting piece (51) and the cover plate (60), and between the second electrical connecting piece (52) and the cover plate (60).

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

14. A battery pack, characterized in that, It includes the battery cell (1) according to any one of claims 1-13.

15. An electrical appliance, characterized in that, Includes the battery pack as described in claim 14.

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