Battery and battery pack

Abstract

The application relates to the technical field of battery devices, and discloses a battery and a battery pack. The battery comprises a cover plate assembly, a pole column suitable for conduction with an external circuit, and an explosion-proof valve; a pole group having a pole group top surface opposite to the cover plate assembly, and a tab formed on the pole group top surface; the plane where the tab is located is arranged at an angle A with the pole group top surface, wherein 0 < A <= 90; a conductive connecting piece is connected between the pole column and the tab, the conductive connecting piece has a pole column connecting part parallel to the pole group top surface, and a tab connecting part arranged at an angle B with the pole column connecting part, wherein 0 < B <= 90; the pole column connecting part is electrically connected with the pole column, and the tab connecting part is electrically connected with the tab; the tab connecting part is supported between the cover plate assembly and the pole group, so that an exhaust cavity communicating with the explosion-proof valve is formed between the cover plate assembly and the pole group top surface; and the melting point of the conductive connecting piece is higher than the exhaust temperature of the battery under a thermal runaway state. The conduction of the exhaust cavity and the explosion-proof valve is ensured.

Description

Technical Field

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

[0002] As battery technology matures, safety requirements are increasing. In traditional prismatic batteries, the cover and housing are welded together to seal the electrode assembly. Connectors connect the electrode assembly to the cover's terminals, while the lower plastic in the cover acts as a retaining force against the electrode assembly.

[0003] However, when a battery experiences thermal runaway, excessive internal temperature and excessive gas production can trigger the explosion valve to open, rapidly discharging the gas. However, during this process, the electrode stack is at risk of being pushed upward by the airflow. At this point, due to the high temperature of the battery during runaway, the lower plastic, made of PP, will completely melt under the high temperature, losing its restraining effect on the electrode stack. This can cause the electrode stack to be lifted by the airflow and potentially clog the explosion valve, accelerating battery runaway and posing a significant safety hazard. Summary of the Invention

[0004] In view of this, the present invention provides a battery and a battery pack to solve the problem that the limiting structure of the electrode group melts during thermal runaway, which easily causes the electrode group to be lifted by the airflow and block the explosion-proof valve.

[0005] In a first aspect, the present invention provides a battery comprising:

[0006] A cover assembly, integrating a pole suitable for conducting with an external circuit and an explosion-proof valve;

[0007] The electrode group has a top surface facing the cover plate assembly, and a pole ear is formed on the top surface of the electrode group; the plane where the pole ear is located is set at an angle A with the top surface of the electrode group, wherein 0°<A≤90°;

[0008] A conductive connecting piece connected between the pole and the tab, the conductive connecting piece having a pole connecting portion parallel to the top surface of the pole group, and a tab connecting portion arranged at an angle B with the pole connecting portion, wherein 0°<B≤90°; the pole connecting portion is electrically connected to the pole, and the tab connecting portion is electrically connected to the tab;

[0009] The pole ear connection portion is supported between the cover plate assembly and the pole group, so that an exhaust cavity connected to the explosion-proof valve is formed between the cover plate assembly and the top surface of the pole group;

[0010] The melting point of the conductive connecting piece is higher than the exhaust temperature of the battery in a thermal runaway state.

[0011] Beneficial effects: The battery provided by the present invention is provided with a conductive connecting piece, and the conductive connecting piece is formed with a pole ear connecting portion, and the pole ear connecting portion is supported between the cover plate assembly and the pole group, so that an exhaust cavity connected to the explosion-proof valve is formed between the cover plate assembly and the pole group; thereby, it can play a supporting role, ensure the conduction between the exhaust cavity and the explosion-proof valve, reduce the risk of the explosion-proof valve being blocked, and improve the safety of the battery during thermal runaway. By setting a conductive connecting piece connected between the pole and the pole lug, the conductive connecting piece has a pole connecting portion parallel to the top surface of the pole group, and a pole lug connecting portion set at an angle B with the pole connecting portion, wherein 0°<B≤90°, and the pole lug connecting portion is electrically connected to the pole lug, so that the pole lug connecting portion is supported between the cover plate assembly and the pole group, so that an exhaust cavity connected to the explosion-proof valve is formed between the cover plate assembly and the top surface of the pole group; at the same time, the pole lug electrically connected to the pole lug connecting portion can be set at an angle A with the top surface of the pole group, wherein 0°<A≤90°, which can ensure that the pole lug is in a more natural shape, reduce bending operations, and avoid adverse conditions such as damage to the pole lug.

[0012] In an optional embodiment, the minimum distance between the surface of the explosion-proof valve facing the top surface of the electrode group and the top surface of the electrode group is H, where H satisfies H≥3mm.

[0013] Beneficial effect: By limiting the minimum distance between the surface of the explosion-proof valve facing the top surface of the pole group and the top surface of the pole group to H, where H satisfies H≥3mm, the pole ear connection part can play the role of supporting the exhaust cavity, avoiding clogging of the explosion-proof valve, and at the same time avoiding the pole group from contacting the connecting piece to cause short circuit or scratching.

[0014] In an optional embodiment, the pole tab connection portion is folded toward one side of the pole group.

[0015] Beneficial effect: By folding the tab connection portion toward one side of the pole group, the tab connection portion can be made to abut against the poles while being convenient for welding the tab connection portion to the poles, without the need for setting up an additional welding structure, thereby simplifying the structural form of the conductive connecting piece.

[0016] In an optional embodiment, the plane where the pole connection portion is located is perpendicular to the plane where the pole tab connection portion is located; and the plane where the pole tab is located is perpendicular to the top surface of the pole group.

[0017] Beneficial Effects: By aligning the plane of the pole connection with the plane of the tab connection, and the plane of the tab with the top surface of the electrode assembly, the plane of the tab and the top surface of the electrode assembly are further ensured to be arranged at right angles, reducing the length of the tab and eliminating the need for folding the tab. This reduces the length of the tab, lowers costs, and reduces the overall width of the electrode sheet, further saving material in the copper and aluminum foil of the electrode sheet and making it easier for equipment to cut. This allows the tab to maintain a more natural shape, reduces bending operations, and avoids damage.

[0018] In an optional embodiment, along a direction perpendicular to the thickness of the battery, the tab includes a first tab portion and a second tab portion spaced apart from each other;

[0019] The pole connecting portion is provided with a tab connecting portion on both sides of the pole connecting portion in a direction perpendicular to the thickness of the battery;

[0020] The pole ear connecting parts on both sides are respectively arranged in contact with the first pole ear part and the second pole ear part, and the conductive connecting sheet is arranged in the area between the first pole ear part and the second pole ear part.

[0021] Beneficial effect: By providing the pole lug connection parts on both sides of the pole connecting part perpendicular to the thickness direction of the battery, the pole lug connection parts on both sides are respectively fitted with the first pole lug part and the second pole lug part, and specifically, the pole lug connection parts are provided on the inner sides of the first pole lug part and the second pole lug part, thereby facilitating the fitting of the pole lugs and the pole lug connection parts and facilitating the welding operation.

[0022] In an optional embodiment, the conductive connecting sheet further includes a bent portion, the bent portion being formed by extending from one end of the tab connecting portion away from the pole connecting portion, and the bent portion being folded toward a side close to the tab;

[0023] The folding angle of the plane where the bending portion is located relative to the plane where the tab connection portion is located is B, where B is ≥ 30°.

[0024] Beneficial effect: By extending a bent portion at one end of the tab connection portion away from the pole connection portion, and folding the bent portion toward the side close to the tab, it is possible to prevent the pole connection portion and the tab from being scratched when the conductive connecting sheet and the tab are assembled, thereby preventing the tab from being damaged.

[0025] In an optional embodiment, the pole connecting portion, the tab connecting portion and the bent portion are integrally formed.

[0026] In an optional embodiment, the conductive connecting piece includes a positive electrode connecting piece and a negative electrode connecting piece, the positive electrode connecting piece is suitable for being connected to the positive electrode column, and the negative electrode connecting piece is suitable for being connected to the negative electrode column;

[0027] The positive electrode connecting piece is made of aluminum, and the negative electrode connecting piece is made of copper.

[0028] In an optional embodiment, the thickness of the positive electrode connecting sheet is not less than 0.5 mm, and the thickness of the negative electrode connecting sheet is not less than 0.3 mm.

[0029] In a second aspect, the present invention further provides a battery pack, comprising: the battery as described above.

[0030] Since the battery pack includes batteries and has the same effect as the batteries, it will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 Schematic diagram of the decomposition of the battery of the present invention;

[0033] Figure 2 is a schematic cross-sectional view of a battery of the present invention;

[0034] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0035] Figure 4 for Figure 1 A partial enlarged view of .

[0036] Description of reference numerals:

[0037] 1. Shell; 2. Pole group; 21. Pole ear; 211. First pole ear portion; 212. Second pole ear portion; 22. Pole group top surface; 3. Conductive connecting piece; 31. Pole column connection portion; 32. Pole ear connection portion; 33. Bending portion; 4. Cover plate assembly; 41. Positive pole; 42. Negative pole; 43. Explosion-proof valve. DETAILED DESCRIPTION

[0038] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0041] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] The following combination Figures 1 to 4 , describing embodiments of the present invention.

[0043] According to an embodiment of the present invention, on one hand, there is provided a battery, comprising:

[0044] The cover plate assembly 4 is integrated with a pole suitable for conducting with an external circuit and an explosion-proof valve 43;

[0045] The electrode group 2 has a top surface 22 facing the cover plate assembly 4, and a pole ear 21 is formed on the top surface 22 of the electrode group; the plane where the pole ear 21 is located is set at an angle A with the top surface 22 of the electrode group, wherein 0°<A≤90°;

[0046] The conductive connecting piece 3 is connected between the pole and the tab 21. The conductive connecting piece 3 has a pole connecting portion 31 parallel to the pole group top surface 22, and a tab connecting portion 32 arranged at an angle B with the pole connecting portion 31, wherein 0°<B≤90°; the pole connecting portion 31 is electrically connected to the pole, and the tab connecting portion 32 is electrically connected to the tab 21;

[0047] The tab connection portion 32 is supported between the cover plate assembly 4 and the electrode group 2, so that an exhaust cavity connected to the explosion-proof valve 43 is formed between the cover plate assembly 4 and the electrode group top surface 22;

[0048] The melting point of the conductive connecting piece 3 is higher than the exhaust temperature of the battery in a thermal runaway state.

[0049] The battery includes a shell 1 having an opening. An electrode group 2 is disposed inside the shell 1 . A cover assembly 4 is disposed on the opening of the shell 1 . The cover assembly 4 is sealed to the shell 1 so as to seal the electrode group 2 inside the shell 1 .

[0050] In order to achieve conduction between the electrode group 2 and the external circuit, a pole suitable for conducting with the external circuit is integrated on the cover assembly 4 , and the pole is connected to the electrode lug 21 through the conductive connecting piece 3 .

[0051] In this embodiment, a positive electrode tab and a negative electrode tab are formed on the top surface 22 of the electrode group. The positive electrode tab is electrically connected to the positive electrode column 41 through the conductive connecting piece 3 , and the negative electrode tab is electrically connected to the negative electrode column 42 through the conductive connecting piece 3 .

[0052] The plane of the tab 21 forms an angle A with the top surface 22 of the electrode assembly, where 0°<A≤90°. The tab 21 is formed by stacking the tab portions extending from multiple electrode sheets. When folded, the tab 21 remains vertical or is arranged at an acute angle to the top surface 22 of the electrode assembly, thereby facilitating the matching welding of the tab 21 with the tab connection portion 32 of the conductive connecting sheet 3. Compared to conventional tab designs, the tab 21 of this embodiment does not need to be folded before being welded to the connecting sheet, which reduces the length of the tab, lowers costs, and reduces the overall width of the electrode sheet. This further saves material for the copper and aluminum foil of the electrode sheet and makes it easier for equipment to cut it. This allows the tab to maintain a more natural shape, reduces bending operations, and avoids damage.

[0053] The battery provided by an embodiment of the present invention is provided with a conductive connecting piece 3, and the conductive connecting piece 3 is formed with a pole tab connecting portion 32. The pole tab connecting portion 32 is supported between the cover plate assembly 4 and the pole group 2, so that an exhaust cavity connected to the explosion-proof valve 43 is formed between the cover plate assembly 4 and the pole group 2; thereby, it can play a supporting role, ensure the conduction between the exhaust cavity and the explosion-proof valve 43, reduce the risk of the explosion-proof valve 43 being blocked, and improve the safety of the battery during thermal runaway.

[0054] When a battery experiences thermal runaway, a large amount of gas is generated. This rapidly discharging gas must be exhausted through the explosion-proof valve. However, since the lower plastic, made of PP, completely melts at high temperatures, it loses its restraining effect on the electrode assembly, putting the electrode assembly at risk of being pushed upward by the airflow. This embodiment incorporates a conductive connector 3. Since the conductive connector 3 has a melting point higher than the exhaust temperature of the battery during thermal runaway, it will not melt. This allows the tab connector 32 to be supported between the cover plate assembly 4 and the electrode assembly 2, preventing the electrode assembly 2 from being lifted by the airflow and potentially blocking the explosion-proof valve, thereby maintaining the exhaust passage of the explosion-proof valve.

[0055] The battery provided by an embodiment of the present invention is connected between the pole and the tab 21 by providing a conductive connecting piece 3, the conductive connecting piece 3 having a pole connecting portion 31 parallel to the pole group top surface 22, and a tab connecting portion 32 arranged at an angle B with the pole connecting portion 31, wherein 0°<B≤90°, and the tab connecting portion 32 is electrically connected to the tab 21, so that the tab connecting portion 32 is supported between the cover plate assembly 4 and the pole group 2, so that an exhaust cavity connected to the explosion-proof valve 43 is formed between the cover plate assembly 4 and the pole group top surface 22; at the same time, the tab 21 electrically connected to the tab connecting portion 32 can be arranged at an angle A with the pole group top surface 22, wherein 0°<A≤90°, which can ensure that the tab is in a more natural shape, reduce bending operations, and avoid adverse conditions such as damage to the tab.

[0056] In some embodiments, the minimum distance between the surface of the explosion-proof valve 43 facing the electrode group top surface 22 and the electrode group top surface 22 is H, where H satisfies H≥3 mm.

[0057] By providing the conductive connecting piece 3, when the battery is under thermal runaway and exhaust is caused, the tab connection portion 32 can be supported between the cover plate assembly 4 and the electrode group 2 to maintain a minimum distance between the surface of the explosion-proof valve 43 facing the electrode group top surface 22 and the electrode group top surface 22.

[0058] The tab connection portion 32 is in surface contact with the pole group 2. In this embodiment, the pole column connection portion 31 is arranged parallel to the pole group top surface 22, and the tab connection portion 32 is perpendicular to the pole column connection portion 31, so that the plane where the tab connection portion 32 is located is perpendicular to the pole group top surface 22.

[0059] Additionally, the plane of the tab connection portion 32 may be arranged at an acute or obtuse angle to the plane of the pole connection portion 31. In this case, to ensure that the surface where the tab connection portion 32 contacts the pole group 2 remains flat, a bend may be further provided at the end of the tab connection portion 32 away from the pole connection portion 31 to ensure that the bent region is in surface contact with the pole group top surface 22. This avoids excessive pressure caused by line contact or point contact, thereby preventing damage to the pole pieces that make up the pole group 2.

[0060] By limiting the minimum distance between the surface of the explosion-proof valve 43 facing the pole group top surface 22 and the pole group top surface 22 to H, where H satisfies H≥3mm, the pole ear connection portion 32 can play a role in supporting the exhaust cavity, avoiding blockage of the explosion-proof valve, and at the same time preventing the pole group from contacting the connecting piece in series to cause a short circuit or scratch.

[0061] The exhaust area of ​​the explosion-proof valve is defined as S1; the minimum exhaust cross-sectional area of ​​the exhaust cavity along the length direction perpendicular to the cover assembly 4 is defined as S2; in order to ensure smooth exhaust, it is necessary to limit S2>S1.

[0062] In this embodiment, the minimum distance H between the first plane and the second plane can be reversely deduced from the minimum exhaust cross-sectional area S2 of the exhaust cavity.

[0063] In some embodiments, combined Figure 4 As shown, the pole tab connection portion 32 is folded toward the pole group 2 .

[0064] By folding the tab connection portion 32 toward the side of the pole group 2, the end of the tab connection portion 32 can be brought into contact with the surface of the pole group 2, so that an exhaust cavity connected to the explosion-proof valve 43 is formed between the cover plate assembly 4 and the pole group 2; and when the pole group 2 is subjected to the push-out force of the airflow toward the side of the explosion-proof valve 43, the tab connection portion 32 can be pressed against the pole group 2 to prevent the pole group 2 from moving, thereby ensuring that the exhaust cavity has sufficient space.

[0065] By folding the tab connection portion 32 toward the electrode group 2 , the tab connection portion 32 can be welded to the tab 21 while playing a contact role. No additional welding structure is required, thus simplifying the structure of the conductive connecting piece 3 .

[0066] In some embodiments, combined Figure 4 As shown, the plane where the pole connection portion 31 is located is perpendicular to the plane where the pole tab connection portion 32 is located; the plane where the pole tab 21 is located is perpendicular to the pole group top surface 22 .

[0067] By aligning the plane of the pole connection portion 31 with the plane of the tab connection portion 32, and the plane of the tab 21 with the top surface 22 of the electrode assembly, the plane of the tab 21 and the top surface 22 of the electrode assembly are further ensured to be arranged at right angles, reducing the length of the tab and eliminating the need to fold the tab 21. This reduces the length of the tab, lowers costs, and reduces the overall width of the electrode sheet, further saving material in the copper and aluminum foil of the electrode sheet and making it easier for equipment to cut. This allows the tab to maintain a more natural shape, reduces bending operations, and avoids damage.

[0068] In some embodiments, combined Figure 4 As shown, along the direction perpendicular to the thickness of the battery, the tab 21 includes a first tab portion 211 and a second tab portion 212 that are spaced apart.

[0069] The pole connecting portion 31 is provided with a tab connecting portion 32 on both sides thereof in a direction perpendicular to the thickness of the battery;

[0070] The tab connecting portions 32 on both sides are respectively arranged to fit the first tab portion 211 and the second tab portion 212 , and the conductive connecting sheet 3 is arranged in the area between the first tab portion 211 and the second tab portion 212 .

[0071] The thickness direction of the battery is the direction in which the electrode sheets are stacked. In this embodiment, the electrode tabs 21 are spaced apart to form a first electrode tab portion 211 and a second electrode tab portion 212 perpendicular to the thickness direction of the battery, thereby conveniently dividing the electrode tabs extending from the electrode assembly into two parts, thereby facilitating the kneading of the electrode tabs 21. This prevents the electrode tabs 21 from being too thick, which would be inconvenient to process.

[0072] By providing the pole lug connection parts 32 on both sides of the pole connecting part 31 in a direction perpendicular to the thickness of the battery, the pole lug connection parts 32 on both sides are respectively arranged to fit with the first pole lug part 211 and the second pole lug part 212, and specifically, the pole lug connection parts 32 are arranged on the inner sides of the first pole lug part 211 and the second pole lug part 212, so as to facilitate the fitting of the pole lugs and the pole lug connection parts 32 and facilitate the welding operation.

[0073] In some embodiments, combined Figure 4 As shown, the conductive connecting piece 3 further includes a bent portion 33, which is formed by extending from one end of the tab connecting portion 32 away from the pole connecting portion 31, and the bent portion 33 is folded toward the side close to the tab 21;

[0074] The bending angle of the plane where the bending portion 33 is located relative to the plane where the tab connecting portion 32 is located is B, where B is ≥ 30°.

[0075] By extending a bent portion 33 at one end of the tab connection portion 32 away from the pole connection portion 31 and folding the bent portion 33 toward the side close to the tab 21, it is possible to prevent the pole connection portion 31 and the tab 21 from being scratched when the conductive connecting sheet 3 and the tab 21 are assembled, thereby preventing the tab 21 from being damaged.

[0076] The bending angle of the plane where the bending portion 33 is located relative to the plane where the tab connection portion 32 is located is not less than 30°, and the length of the bending portion 33 extending from the tab connection portion 32 is not less than 1 mm.

[0077] In some embodiments, combined Figure 4 As shown, the pole connecting portion 31 , the tab connecting portion 32 and the bent portion 33 are integrally formed.

[0078] That is, by making the conductive connecting piece 3 integrally stamped, the processing and forming of the conductive connecting piece 3 can be facilitated, the processing cost can be reduced, and the bending angle of the tab connecting portion 32 can be easily ensured.

[0079] In some embodiments, combined Figure 1 As shown, the conductive connecting piece 3 includes a positive connecting piece and a negative connecting piece. The positive connecting piece is suitable for connecting to the positive electrode column 41, and the negative connecting piece is suitable for connecting to the negative electrode column 42.

[0080] The positive electrode connecting piece is made of aluminum, and the negative electrode connecting piece is made of copper.

[0081] In some embodiments, the thickness of the positive electrode connecting tab is not less than 0.5 mm, and the thickness of the negative electrode connecting tab is not less than 0.3 mm.

[0082] Since aluminum is a relatively soft material, in order to ensure that the positive electrode connecting piece does not deform against the impact of the pole during thermal runaway, the thickness of the positive electrode connecting piece should be no less than 0.5 mm.

[0083] Since copper is relatively hard, the thickness of the negative electrode connecting piece can be relatively thin. In this embodiment, the thickness of the negative electrode connecting piece is not less than 0.3 mm.

[0084] According to another aspect of an embodiment of the present invention, a battery pack is provided, comprising: the battery as described above.

[0085] The battery pack provided by an embodiment of the present invention is provided with a conductive connecting piece 3, and the conductive connecting piece 3 is formed with a pole tab connecting portion 32, and the pole tab connecting portion 32 is supported between the cover plate assembly 4 and the pole group 2, so that an exhaust cavity connected to the explosion-proof valve 43 is formed between the cover plate assembly 4 and the pole group 2; thereby, it can play a supporting role, ensure the conduction between the exhaust cavity and the explosion-proof valve 43, reduce the risk of the explosion-proof valve 43 being blocked, and improve the safety of the battery during thermal runaway.

[0086] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the present invention.

Claims

1. A battery, characterized in that: include: A cover assembly, integrating a pole suitable for conducting with an external circuit and an explosion-proof valve; The electrode group has a top surface facing the cover plate assembly, and a pole ear is formed on the top surface of the electrode group; the plane where the pole ear is located is arranged at an angle A with the top surface of the electrode group, wherein 0°<A≤90°; A conductive connecting piece connected between the pole and the tab, the conductive connecting piece having a pole connecting portion parallel to the top surface of the pole group, and a tab connecting portion arranged at an angle B with the pole connecting portion, wherein 0°<B≤90°; the pole connecting portion is electrically connected to the pole, and the tab connecting portion is electrically connected to the tab; The electrode tab connection portion is supported between the cover plate assembly and the electrode group, so that an exhaust cavity connected to the explosion-proof valve is formed between the cover plate assembly and the top surface of the electrode group; The melting point of the conductive connecting piece is higher than the exhaust temperature of the battery in a thermal runaway state; The minimum distance between the surface of the explosion-proof valve facing the top surface of the electrode group and the top surface of the electrode group is H, where H satisfies H≥3mm; The tab connection portion is folded toward one side of the pole group; the plane where the pole column connection portion is located is perpendicular to the plane where the tab connection portion is located; the plane where the tab is located is perpendicular to the top surface of the pole group; The tab includes a first tab portion and a second tab portion spaced apart in a direction perpendicular to the thickness of the battery; the tab connection portion is provided on both sides of the pole connecting portion in a direction perpendicular to the thickness of the battery; the tab connection portions on both sides are respectively arranged in contact with the first tab portion and the second tab portion, and the conductive connecting sheet is provided in the area between the first tab portion and the second tab portion; The conductive connecting piece further includes a bent portion, the bent portion extending from one end of the tab connecting portion away from the pole connecting portion, and the bent portion folded toward a side close to the tab; the folding angle of the plane where the bent portion is located relative to the plane where the tab connecting portion is located is B, where B is ≥ 30°; The exhaust area of ​​the explosion-proof valve is defined as S1; the minimum exhaust cross-sectional area of ​​the exhaust cavity along the length direction perpendicular to the cover assembly (4) is defined as S2; in order to ensure smooth exhaust, it is necessary to limit S2>S1.

2. The battery according to claim 1, characterized in that The pole connecting portion, the tab connecting portion and the bent portion are integrally formed.

3. The battery according to any one of claims 1 to 2, characterized in that The conductive connecting piece includes a positive connecting piece and a negative connecting piece, wherein the positive connecting piece is suitable for connecting to the positive electrode column, and the negative connecting piece is suitable for connecting to the negative electrode column; The material of the positive electrode connecting piece includes aluminum, and the material of the negative electrode connecting piece includes copper.

4. The battery according to claim 3, characterized in that The thickness of the positive electrode connecting sheet is not less than 0.5 mm, and the thickness of the negative electrode connecting sheet is not less than 0.3 mm.

5. A battery pack, characterized in that: A battery according to any one of claims 1 to 4.

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