Battery, battery pack and electric device

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery, a battery pack and an electric device. The battery comprises a shell, a pole core and a conductive connecting piece, the pole core comprises a diaphragm and a plurality of pole pieces, the polarities of every two adjacent pole pieces are opposite, the two adjacent pole pieces are spaced through the diaphragm, and tabs are arranged on the pole pieces; the pole piece comprises a foil and an active material layer; the conductive connecting piece is positioned between the pole core and the inner surface of the shell; the conductive connecting piece is used for conducting the tab on each pole piece and the foil, and the transmission path of electrons can be increased through the conductive connecting piece, so that the electrons can reach all positions of the pole pieces more quickly, and the problem that the electron path is limited is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to a battery, a battery pack and an electric device. Background Art

[0002] In related technologies, two positive electrode tabs and two negative electrode tabs are respectively arranged at both ends of the electrode core of a laminated battery, which increases the width of the tabs and to a certain extent increases the current-carrying capacity of the battery cell. However, when the current passes through the electrode plate, the path for electrons to flow from the tab to the side of the electrode plate far from the tab is still limited, affecting the electron transfer efficiency. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is: aiming at the problem that the path for electrons to flow from the tab to the side of the electrode plate far from the tab in the existing technology is limited and affects the electron transfer efficiency, a battery, a battery pack and an electric device are provided.

[0004] To solve the above technical problem, on the one hand, an embodiment of the utility model provides a battery, including a housing, an electrode core and a conductive connecting member. The electrode core is arranged in the housing. The electrode core includes a separator and a plurality of electrode plates laminated along a first direction. The polarities of two adjacent electrode plates are opposite and are spaced apart by the separator. An electrode tab is arranged on the electrode plate. The electrode plate includes a foil material and an active material layer arranged on the foil material.

[0005] The conductive connecting member is connected to the electrode core and is located between the electrode core and the inner surface of the housing. The conductive connection is used for conducting the electrode tab and the foil material on each electrode plate.

[0006] Optionally, the electrode plates include positive electrode plates and negative electrode plates. The positive electrode plates and the negative electrode plates are arranged alternately. A positive electrode tab is arranged on the positive electrode plate, and a negative electrode tab is arranged on the negative electrode plate. The positive electrode tab and the negative electrode tab extend out of the electrode core along a third direction. The positive electrode plate includes a positive electrode foil material and a positive electrode active material layer arranged on the positive electrode foil material. The negative electrode plate includes a negative electrode foil material and a negative electrode active material layer arranged on the negative electrode foil material.

[0007] The first conductive connecting member and the second conductive connecting member are oppositely arranged on the electrode core along a second direction. The second direction, the first direction and the third direction are perpendicular to each other in pairs.

[0008] The first conductive connecting member is used for conducting the positive electrode tab and the positive electrode foil material on each positive electrode plate. The second conductive connecting member is used for conducting the negative electrode tab and the negative electrode foil material on each negative electrode plate.

[0009] Optionally, the electrode core has a first side and a second side oppositely arranged in the second direction, the first conductive connection member is mounted on the first side, and the second conductive connection member is mounted on the second side.

[0010] Optionally, the positive electrode sheet includes a positive electrode coating area and a positive electrode bare foil area connected to each other, the positive electrode bare foil area is located on one side of the positive electrode coating area, and the positive electrode bare foil areas of multiple positive electrode sheets are connected to form the first conductive connection member.

[0011] Optionally, the positive electrode bare foil area includes a first positive electrode bare foil area and a second positive electrode bare foil area, the first positive electrode bare foil area is located at one end of the positive electrode coating area in the third direction, one end of the second positive electrode bare foil area is connected to the first positive electrode bare foil area, and the other end of the second positive electrode bare foil area extends along the third direction away from one end of the first positive electrode bare foil area.

[0012] Optionally, the negative electrode sheet includes a negative electrode coating area and a negative electrode bare foil area connected to each other, the negative electrode bare foil area is located on one side of the negative electrode coating area, and the negative electrode bare foil areas of multiple negative electrode sheets are connected to form the second conductive connection member.

[0013] Optionally, the negative electrode bare foil area includes a first negative electrode bare foil area and a second negative electrode bare foil area, the first negative electrode bare foil area is located at one end of the negative electrode coating area in the third direction, one end of the second negative electrode bare foil area is connected to the first negative electrode bare foil area, and the other end of the second negative electrode bare foil area extends along the third direction away from one end of the first negative electrode bare foil area towards the negative electrode sheet.

[0014] Optionally, the separator is in a "Z" shape, and the positive electrode sheet and the negative electrode sheet are arranged on opposite sides of the separator.

[0015] Optionally, the first conductive connection member and the negative electrode sheet are spaced apart by the separator, and the second conductive connection member and the positive electrode sheet are spaced apart by the separator.

[0016] Optionally, a metal layer is provided on one side of the conductive connection member close to the electrode core.

[0017] Optionally, an insulating member is further included, the conductive connection member is a metal member, and the insulating member is arranged between the conductive connection member and the inner surface of the housing.

[0018] Optionally, the first conductive connection member includes a first connection member and a second connection member, one end of the first connection member is connected to the positive electrode tab, one end of the second connection member is connected to the other end of the first connection member, and the other end of the second connection member extends towards the end of the electrode sheet away from the tab.

[0019] Optionally, a conductive layer is further included, and the conductive layer is arranged between the conductive connecting member and the pole core.

[0020] On the other hand, an embodiment of the present invention provides a battery pack, comprising the battery as described above.

[0021] On the other hand, an embodiment of the present invention provides an electrical device, including the battery pack as described above.

[0022] A battery provided by an embodiment of the utility model conducts the foil of the pole ear and the pole piece through a conductive connector, so that after the electrons reach the conductive connector through the pole ear, the electrons can be transmitted to the pole piece through the conductive connector, or the electrons can be transmitted from the pole piece to the pole ear, which can increase the transmission path of the electrons and reduce the electron transmission distance, so that the electrons can reach various parts of the pole piece more quickly, and effectively improve the problem of limited or too long path for electrons to flow from the pole ear to the side of the pole piece away from the pole ear, or the problem of too long or limited path for transmitting electrons from the pole piece to the pole ear. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of a pole core and a conductive connecting member provided in one embodiment of the utility model;

[0024] Figure 2 It is a schematic diagram of a pole core provided by an embodiment of the utility model;

[0025] Figure 3 It is a schematic diagram of a positive electrode sheet provided by an embodiment of the utility model;

[0026] Figure 4 It is a schematic diagram of a negative electrode sheet provided in one embodiment of the utility model.

[0027] The reference numerals in the specification are as follows:

[0028] 1. Electrode core; 11. Positive electrode sheet; 111. Positive electrode coating area; 112. Positive electrode empty foil area; 1121. First positive electrode empty foil area; 1122. Second positive electrode empty foil area; 12. Negative electrode sheet; 121. Negative electrode coating area; 122. Negative electrode empty foil area; 1221. First negative electrode empty foil area; 1222. Second negative electrode empty foil area; 13. Positive electrode ear; 14. Negative electrode ear; 15. Diaphragm;

[0029] 2. first conductive connecting member; 21. first connecting member; 22. second connecting member;

[0030] 3. A second conductive connecting member;

[0031] 41. a first conductive layer; 42. a second conductive layer;

[0032] a, first direction; b, second direction; c, third direction. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0034] like Figures 1 to 4 As shown, a battery provided by an embodiment of the utility model includes a housing, a pole core 1 and a conductive connector, wherein the pole core 1 is arranged in the housing. The pole core 1 includes a diaphragm 15 and a plurality of pole pieces stacked along a first direction, wherein the polarities of two adjacent pole pieces are opposite and separated by the diaphragm 15.

[0035] The pole piece is provided with a pole ear, and the pole piece includes a foil and an active material layer provided on the foil. The conductive connector is provided between the pole core 1 and the inner surface of the shell. The conductive connector can connect the foils of multiple pole pieces with the same polarity. When transmitting electrons, the conductive connector is used for conduction between the pole ear and the foil on each pole piece. Among them, at least one conductive connector is provided, and the conductive connector can be in contact and conduction with the foils of multiple positive pole pieces or in contact and conduction with the foils of multiple negative pole pieces.

[0036] The pole ear is arranged at one end of the pole piece. In the direction of the electron transmission path, the electron arrival distance at the end of the pole piece close to the pole ear is different from that at the end of the pole piece far from the pole ear. Moreover, the dressing on the pole piece has impedance, which will affect the transmission rate of the electrons. In this embodiment, the pole ear and the foil are connected by a conductive connector, so that after the electrons reach the conductive connector through the pole ear, the electrons can be transmitted to the pole piece through the conductive connector, which can increase the electron transmission path and reduce the electron transmission distance. The electrons can reach various parts of the pole piece more quickly, effectively improving the problem of limited passage of electrons flowing from the pole ear to the side of the pole piece far from the pole ear.

[0037] In one embodiment, the electrode sheets include a positive electrode sheet 11 and a negative electrode sheet 12 stacked along a first direction, the positive electrode sheets 11 and the negative electrode sheets 12 are alternately arranged, a separator 15 is arranged between the positive electrode sheet 11 and the negative electrode sheet 12, a positive electrode ear 13 is arranged on the positive electrode sheet 11, and a negative electrode ear 14 is arranged on the negative electrode sheet 12. The positive electrode ear 13 and the negative electrode ear 14 are led out from the electrode core 1 along a third direction c, and the positive electrode ear 13 and the negative electrode ear 14 can be located on the same side of the electrode core 1 or on opposite sides of the third direction.

[0038] The positive electrode sheet 11 includes a positive electrode foil and a positive electrode active material layer disposed on the positive electrode foil, and the negative electrode sheet 12 includes a negative electrode foil and a negative electrode active material layer disposed on the negative electrode foil.

[0039] The first conductive connector 2 and the second conductive connector 3 are arranged opposite to each other on the pole core 1 along the second direction. The first conductive connector 2 is located between one side of the pole core 1 in the second direction and the inner surface of the shell. The first conductive connector 2 can be in contact with and conduct with the positive electrode foils of multiple positive electrode sheets 11. The second conductive connector 3 is located between the other side of the pole core 1 in the second direction and the inner surface of the shell. The second conductive connector 3 can be in contact with and conduct with the negative electrode foils of multiple negative electrode tabs 14. The first direction a, the second direction b and the third direction c are perpendicular to each other. The first conductive connector 2 is used for conduction between the positive electrode tab 13 and the positive electrode foil on each positive electrode sheet 11, and the second conductive connector 3 is used for conduction between the negative electrode tab 14 and the negative electrode foil on each negative electrode sheet 12.

[0040] In this embodiment, the positive electrode ear 13 and the positive electrode foil can be connected by the first conductive connector 2, so that after the electrons reach the first conductive connector 2 through the positive electrode ear 13, the electrons can be transmitted to the positive electrode sheet 11 through the first conductive connector 2, which can increase the transmission path of the electrons and reduce the transmission distance of the electrons. The electrons can reach various parts of the positive electrode sheet 11 more quickly, effectively improving the problem of the limited passage of the electrons flowing from the positive electrode ear 13 to the side of the positive electrode sheet 11 away from the positive electrode ear 13. The negative electrode ear 14 and the negative electrode foil are connected by the second conductive connector 3, so that after the electrons reach the second conductive connector 3 through the negative electrode ear 14, the electrons can be transmitted to the negative electrode sheet 12 through the second conductive connector 3, which can increase the transmission path of the electrons and reduce the transmission distance of the electrons. The electrons can reach various parts of the negative electrode sheet 12 more quickly, effectively improving the problem of the limited passage of the electrons flowing from the negative electrode ear 14 to the side of the negative electrode sheet 12 away from the negative electrode ear 14.

[0041] Furthermore, there is no impedance caused by dressing on the first conductive connector 2 and the second conductive connector 3, which greatly increases the transmission efficiency of electrons and reduces the internal polarization of the battery.

[0042] Especially for longer batteries such as blade batteries, the distance between the end of the pole piece close to the pole ear and the end of the pole piece away from the pole ear is relatively large, and the first conductive connector 2 and the second conductive connector 3 have a significant improvement in the transmission efficiency of electrons.

[0043] Among them, the first direction a is the thickness direction of the electrode sheet, the second direction b is the length direction or the width direction of the electrode sheet, the battery is a laminated battery, after multiple positive electrode sheets 11 are stacked, the positive electrode ears 13 of the multiple positive electrode sheets 11 are connected and can be connected to the outside of the battery, and after multiple negative electrode sheets 12 are stacked, the negative electrode ears 14 of the multiple negative electrode sheets 12 are connected and can be connected to the outside of the battery.

[0044] Specifically, during the charge and discharge processes of the battery, the flow direction of electrons is different. When charging a lithium-ion battery, electrons move from the positive electrode to the negative electrode. The electrons are transmitted from the negative electrode tab 14 to the negative electrode plate 12. The negative electrode tab 14 is connected to the negative electrode foil and can transmit electrons. On this basis, the second conductive connection member 3 can increase the electron transmission path between the negative electrode tab 14 and the negative electrode plate 12. When discharging the lithium-ion battery, the direction of electron movement is opposite, and electrons move from the negative electrode to the positive electrode. The electrons are transmitted from the positive electrode tab 13 to the positive electrode plate 11. The positive electrode tab 13 is connected to the positive electrode foil and can transmit electrons. The first conductive connection member 2 can increase the electron transmission path between the positive electrode tab 13 and the positive electrode foil. That is, the first conductive connection member 2 increases the electron transmission path during battery discharge, and the second conductive connection member 3 increases the electron transmission path during battery charging.

[0045] In one embodiment, the electrode core 1 has a first side surface and a second side surface that are oppositely arranged in the second direction b. The first conductive connection member 2 is installed on the first side surface, and the second conductive connection member 3 is installed on the second side surface. On the first side surface, the positive electrode foil of the positive electrode plate 11 can be exposed, and the exposed area is the cross-sectional area of the positive electrode plate 11 in the first direction. By installing the first conductive connection member 2 on the first side surface, the positive electrode foils of each positive electrode plate 11 stacked in the thickness direction can be electrically connected to the first conductive connection member 2. On the second side surface, the negative electrode foil of the negative electrode plate 12 can be exposed, and the exposed area is the cross-sectional area of the negative electrode plate 12 in the first direction. By installing the second conductive connection member 3 on the second side surface, the negative electrode foils of each negative electrode plate 12 stacked in the thickness direction can be electrically connected to the second conductive connection member 3.

[0046] As an example, one end of the battery is the positive electrode and the other end is the negative electrode. The third direction is the length direction of the electrode core 1, and the second direction is the width direction of the electrode core 1. After a plurality of positive electrode plates 11 and a plurality of negative electrode plates 12 are alternately stacked, the positive electrode tabs 13 and the negative electrode tabs 14 are arranged at opposite ends of the electrode core 1 along the third direction, and the first conductive connection member 2 and the second conductive connection member 3 are arranged on opposite sides of the electrode core 1 along the second direction.

[0047] In another example, the positive electrode and the negative electrode are located at the same end of the battery. The third direction is the length direction of the electrode core 1, and the second direction is the width direction of the electrode core 1. After a plurality of positive electrode plates 11 and a plurality of negative electrode plates 12 are alternately stacked, both the positive electrode tabs 13 and the negative electrode tabs 14 are located at one end of the electrode core 1 in the third direction. The first conductive connection member 2 is installed on the first side surface, and the second conductive connection member 3 is installed on the second side surface. In this example, the third direction can also be the width direction of the electrode core 1, and the second direction is the length direction of the electrode core 1.

[0048] In one embodiment, as Figure 2As shown, the battery is a Z-shaped laminated battery. The positive electrode sheet 11 and the negative electrode sheet 12 are arranged on opposite sides of the separator 15. The separator 15 is folded in a "Z" shape to separate the positive electrode sheet 11 and the negative electrode sheet 12, which can prevent the positive electrode sheet 11 and the negative electrode sheet 12 from contacting each other.

[0049] Among them, the first conductive connecting member 2 and the second conductive connecting member 3 are arranged on opposite sides of the electrode core 1, and the first conductive connecting member 2 is on the same side of the separator 15 as the positive electrode sheet 11, and the second conductive connecting member 3 is on the other side of the separator 15 from the negative electrode sheet 12. After the lamination is completed, when the first conductive connecting member 2 is installed on the first side of the electrode core 1, the first conductive connecting member 2 and the negative electrode sheet 12 are separated by the separator 15, and the first conductive connecting member 2 can only contact the positive electrode foil to achieve conduction. When the second conductive connecting member 3 is installed on the second side of the electrode core 1, the second conductive connecting member 3 and the positive electrode sheet 11 are separated by the separator 15, and the second conductive connecting member 3 can only contact the negative electrode foil to achieve conduction.

[0050] In an alternative embodiment, when the battery is a stacked laminated battery, the separator 15 is cut into small pieces and stacked layer by layer in the order of the positive electrode sheet 11, the separator 15, and the negative electrode sheet 12 to form the electrode core 1. At this time, on the first side and the second side, the positive electrode sheet 11 and the negative electrode sheet 12 are not aligned, so that the first conductive connecting member 2 only contacts the positive electrode foil, and the second conductive connecting member 3 only contacts the negative electrode foil, avoiding the short circuit of the positive and negative electrode sheets.

[0051] In one embodiment, the positive electrode sheet 11 includes a positive electrode coating area 111 and a positive electrode empty foil area 112 connected to each other. The positive electrode empty foil area 112 is located on one side of the positive electrode coating area 111. The positive electrode empty foil areas 112 of multiple positive electrode sheets 11 are connected to form the first conductive connecting member 2. There is no dressing on the positive electrode empty foil area 112, and its impedance is smaller than that of the positive electrode coating area 111, so that the positive electrode empty foil area 112 has the effect of accelerating electron transmission.

[0052] Among them, after the coating is completed, the positive electrode empty foil area 112 can expose the foil by cleaning the dressing on the foil through processes such as laser cleaning. Or a positive electrode empty foil area 112 is reserved on the positive electrode foil of the positive electrode sheet 11 during the coating stage of the positive electrode sheet 11.

[0053] In one embodiment, the positive electrode empty foil area 112 includes a first positive electrode empty foil area 1121 and a second positive electrode empty foil area 1122, the positive electrode empty foil area 112 is L-shaped, the first positive electrode empty foil area 1121 is located at one end of the positive electrode coating area 111 in the third direction, and the first positive electrode empty foil area 1121 extends along the second direction b, one end of the second positive electrode empty foil area 1122 is connected to the first positive electrode empty foil area 1121, and the other end of the second positive electrode empty foil area 1122 is toward the positive electrode along the third direction c. The pole piece 11 extends away from one end of the first positive electrode empty foil area 1121, wherein the first positive electrode empty foil area 1121 is connected to the positive electrode ear 13, and the positive electrode ear 13 and the second positive electrode empty foil area 1122 can be connected through the first positive electrode empty foil area 1121, and the second positive electrode empty foil area 1122 extends toward the end of the positive electrode piece 11 away from the positive electrode ear 13, so that electrons can be transmitted to the end of the positive electrode piece 11 away from the positive electrode ear 13 as soon as possible, thereby increasing the transmission path and transmission efficiency of electrons. In an alternative embodiment, a portion of the first positive electrode empty foil area 1121 can be used as a pole ear, and the remaining portion is connected between the pole ear and the second positive electrode empty foil area 1122.

[0054] Among them, the size of the second positive electrode empty foil area 1122 in the third direction c is consistent with the size of the positive electrode sheet 11 in the third direction c, so that electrons can reach various parts of the positive electrode sheet 11 more quickly, further ensuring the transmission efficiency of electrons and reducing the limitation of the electron path between the positive electrode ear 13 and the end of the positive electrode sheet 11 away from the positive electrode ear 13.

[0055] In one embodiment, the negative electrode sheet 12 includes a negative electrode coating area 121 and a negative electrode empty foil area 122 connected to each other, the negative electrode empty foil area 122 is located on one side of the negative electrode coating area 121, and the negative electrode empty foil areas 122 of a plurality of negative electrode sheets 12 are connected to form a second conductive connector 3. There is no dressing on the negative electrode empty foil area 122, and its impedance is smaller than that of the negative electrode coating area 121, so that the negative electrode empty foil area 122 has the effect of accelerating electron transmission.

[0056] The negative electrode empty foil area 122 can be exposed by removing the dressing on the foil through laser cleaning or other processes after coating. Alternatively, the negative electrode empty foil area 122 can be reserved on the negative electrode foil of the negative electrode sheet 12 during the coating stage of the negative electrode sheet 12 .

[0057] As an example, the positive electrode sheet 11 includes a positive electrode coating area 111 and a positive electrode empty foil area 112, the negative electrode sheet 12 includes a negative electrode coating area 121 and a negative electrode empty foil area 122, and multiple positive electrode sheets 11 and multiple negative electrode sheets 12 are alternately stacked. The first conductive connector 2 formed by connecting the positive electrode empty foil areas 112 of the multiple positive electrode sheets 11 is located on one side of the pole core 1 in the second direction b, and the second conductive connector 3 formed by connecting the negative electrode empty foil areas 122 of the multiple negative electrode sheets 12 is located on the other side of the pole core 1 in the second direction b, thereby realizing accelerated transmission of electrons during battery charging and discharging.

[0058] In one embodiment, the negative electrode empty foil area 122 includes a first negative electrode empty foil area 1221 and a second negative electrode empty foil area 1222, and the negative electrode empty foil area 122 has an L-shaped structure. The first negative electrode empty foil area 1221 is located at one end of the negative electrode coating area 121 in the third direction and the first negative electrode empty foil area 1221 extends along the second direction b, one end of the second negative electrode empty foil area 1222 is connected to the first negative electrode empty foil area 1221, and the other end of the second negative electrode empty foil area 1222 extends along the third direction toward the negative electrode sheet 12 away from one end of the first negative electrode empty foil area 1221. The first negative electrode empty foil area 1221 is connected to the negative electrode ear 14, and the negative electrode ear 14 and the second negative electrode empty foil area 1222 are connected through the first negative electrode empty foil area 1221, and the second negative electrode empty foil area 1222 extends toward the end of the negative electrode sheet 12 away from the negative electrode ear 14, so that electrons can be transmitted to the end of the negative electrode sheet 12 away from the negative electrode ear 14 as soon as possible, thereby increasing the transmission path and transmission efficiency of electrons. In an alternative embodiment, a portion of the first negative electrode empty foil area 1221 is directly used as the negative electrode ear, and the remaining portion is connected between the negative electrode ear and the second negative electrode empty foil area 1222.

[0059] Among them, the size of the second negative electrode empty foil area 1222 in the third direction c is consistent with the size of the negative electrode sheet 12 in the third direction c, so that electrons can reach various parts of the negative electrode sheet 12 more quickly, which can further ensure the transmission efficiency of electrons and reduce the situation where the electron path between the negative electrode ear 14 and the end of the negative electrode sheet 12 away from the negative electrode ear 14 is restricted.

[0060] In another embodiment, a metal layer is provided on one side of the conductive connector close to the pole core 1, and the metal layer can realize conduction between the pole ear and the foil, thereby increasing the transmission path of electrons.

[0061] Among them, the conductive connector is made of insulating material, and a metal layer is formed on one side of the conductive connector by spraying, painting, stamping and other processes, so as to obtain a conductive connector with a metal layer, so that the side of the conductive connector close to the pole core 1 is connected to the foil through the metal layer, and the side of the conductive connector away from the pole core 1 can be insulated from the shell. Alternatively, the conductive connector is made of metal material, and the conductive connector can achieve conduction between the pole ear and the foil.

[0062] Further, a first metal layer is provided on the side of the first conductive connection member 2 close to the electrode core 1. The first metal layer can conduct the positive electrode tab 13 and the positive electrode foil, enabling the positive electrode tab 13 to transmit electrons to the positive electrode plate 11 through the first metal layer, thereby increasing the electron transmission path on the positive electrode plate 11, greatly increasing the electron transmission efficiency, and reducing the polarization inside the battery. The side of the first conductive connection member 2 close to the inner wall surface of the housing is made of an insulating material, which can insulate the first conductive connection member 2 from the housing and prevent internal short circuit. A second metal layer is provided on the side of the second conductive connection member 3 close to the electrode core 1. The second metal layer can conduct the negative electrode tab 14 and the negative electrode foil, enabling the negative electrode tab 14 to transmit electrons to the negative electrode plate 12 through the second metal layer, thereby increasing the electron transmission path on the negative electrode plate 12, greatly increasing the electron transmission efficiency, and reducing the polarization inside the battery. The side of the second conductive connection member 3 close to the inner wall surface of the housing is made of an insulating material, which can insulate the second conductive connection member 3 from the housing and prevent internal short circuit.

[0063] Wherein, the first conductive connection member 2 and the second conductive connection member 3 are in a flat plate shape, and the first metal layer and the second metal layer are formed by processes such as spraying, painting, and stamping using a conductive material with pores or post-process pores. The first metal layer and the second metal layer include but are not limited to a copper metal layer and an aluminum metal layer. Preferably, the first metal layer is an aluminum metal layer and the second metal layer is a copper metal layer.

[0064] As an example, the battery includes a first conductive connection member 2 and a second conductive connection member 3 on opposite sides in the second direction. The first conductive connection member 2 is installed on the first side surface, and the first metal layer of the first conductive connection member 2 can conduct the positive electrode tab 13 and the positive electrode foil, thereby increasing the electron transmission path. The second conductive connection member 3 is installed on the second side surface, and the second metal layer of the second conductive connection member 3 can conduct the negative electrode tab 14 and the negative electrode foil, thereby increasing the electron transmission path.

[0065] In another embodiment, the battery further includes an insulating member. The conductive connection member is a metal member that can contact and conduct with the foil. The insulating member is disposed between the conductive connection member and the inner surface of the housing, and can insulate the conductive connection member from the inner surface of the housing.

[0066] Specifically, the insulating member includes a first insulating member and a second insulating member. The first conductive connecting member 2 and the second conductive connecting member 3 are metal members. The first conductive connecting member 2 and the second conductive connecting member 3 are in a flat plate shape. The first insulating member is disposed between the first conductive connecting member 2 and the inner surface of the housing, and can achieve insulation between the first conductive connecting member 2 and the inner surface of the housing, avoiding internal short - circuit caused by conduction between the first conductive connecting member 2 and the housing. The second insulating member is disposed between the second conductive connecting member 3 and the inner surface of the housing, and can achieve insulation between the second conductive connecting member 3 and the inner surface of the housing, avoiding internal short - circuit caused by conduction between the second conductive connecting member 3 and the housing.

[0067] Among them, the first insulating member and the second insulating member include, but are not limited to, tape, insulating film, etc., which can achieve insulation and do not occupy too much space inside the housing. The first conductive connecting member 2 and the second conductive connecting member 3 include, but are not limited to, copper plates, aluminum plates. Preferably, the first conductive connecting member 2 is an aluminum plate, and the second conductive connecting member 3 is a copper plate.

[0068] In an embodiment, the battery further includes a conductive layer. The conductive layer is disposed between the conductive connecting member and the electrode core 1. When the conductive connecting member is made of an insulating material, the conductive layer can connect the conductive connecting member to the electrode core 1 and achieve conduction between the foil and the metal layer. Or, when the conductive connecting member is made of a metal material, the conductive layer can connect the conductive connecting member to the electrode core 1 and achieve conduction between the foil and the conductive connecting member.

[0069] Specifically, the conductive layer includes a first conductive layer 41 and a second conductive layer 42. The first conductive layer 41 is disposed between the first conductive connecting member 2 and the electrode core 1. The first conductive connecting member 2 is mounted on the electrode core 1 through the first conductive layer 41, and the first conductive layer 41 has a conductive function, which can achieve conduction between the first conductive connecting member 2 and the positive electrode foil. The second conductive layer 42 is disposed between the second conductive connecting member 3 and the electrode core 1. The second conductive connecting member 3 is mounted on the electrode core 1 through the second conductive layer 42, and the second conductive layer 42 has a conductive function, which can achieve conduction between the second conductive connecting member 3 and the negative electrode foil.

[0070] Preferably, the first conductive layer 41 and the second conductive layer 42 are conductive adhesives. The conductive adhesives are sprayed on the first side and the second side of the electrode core 1. Then, the first conductive connecting member 2 is attached to the first side, and the second conductive connecting member 3 is attached to the second side.

[0071] In another embodiment, the conductive connector includes a first connector 21 and a second connector 22, the cross-sectional diagram of the conductive connector is an L-shaped structure, the first connector 21 is connected to the pole ear, the first connector 21 extends along the second direction, one end of the second connector 22 is connected to the end of the first connector 21 away from the pole ear, the connection between the pole ear and the second connector 22 is achieved through the first connector 21, and the other end of the second connector 22 extends along the third direction toward the end of the pole piece away from the pole ear, so that electrons can be transmitted to the end of the pole piece away from the pole ear as soon as possible, thereby increasing the transmission path and transmission efficiency of electrons.

[0072] Among them, the size of the second connecting member 22 in the third direction c is consistent with the size of the pole piece in the third direction c, so that electrons can reach various parts of the pole piece more quickly, which can further ensure the transmission efficiency of electrons and reduce the situation where the electron path between the pole ear and the end of the pole piece away from the pole ear is restricted.

[0073] Furthermore, the first conductive connector 2 and the second conductive connector 3 have the same structure, both of which are L-shaped. The first connector 21 of the first conductive connector 2 is connected between the positive electrode ear 13 and one end of the second connector 22, and the other end of the second connector 22 of the first conductive connector 2 extends along the third direction toward the end of the positive electrode sheet 11 away from the positive electrode ear 13, so that electrons can be transmitted to the end of the positive electrode sheet 11 away from the positive electrode ear 13 as soon as possible, thereby increasing the transmission path and transmission efficiency of electrons.

[0074] The first connector 21 of the second conductive connector 3 is connected between the negative electrode ear 14 and one end of the second connector 22, and the other end of the second connector 22 of the second conductive connector 3 extends along the third direction toward the end of the negative electrode sheet 12 away from the negative electrode ear 14, so that electrons can be transmitted to the end of the negative electrode sheet 12 away from the electrode ear as quickly as possible, thereby increasing the transmission path and transmission efficiency of electrons.

[0075] On the other hand, an embodiment of the present invention provides a battery pack, comprising the battery of the above embodiment.

[0076] On the other hand, an embodiment of the utility model provides an electrical device, including the battery pack of the above embodiment.

[0077] In one embodiment, the electrical device is a vehicle, and the battery pack can provide electrical energy for the vehicle.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery, comprising a housing, an electrode core, and a conductive connection member. The electrode core is disposed within the housing. The electrode core includes a separator and a plurality of electrode plates stacked in a first direction. Adjacent two of the electrode plates have opposite polarities and are spaced apart by the separator. The electrode plates are provided with electrode tabs, and the electrode plates include foil materials and active material layers disposed on the foil materials. It is characterized in that The conductive connection member is connected to the electrode core and is located between the electrode core and the inner surface of the housing. The conductive connection member is used for conducting the electrode tabs on the electrode plates and the foil materials.

2. The battery according to claim 1, characterized in that, The electrode plates include positive electrode plates and negative electrode plates, and the positive electrode plates and the negative electrode plates are alternately arranged. The positive electrode plates are provided with positive electrode tabs, and the negative electrode plates are provided with negative electrode tabs. The positive electrode tabs and the negative electrode tabs extend from the electrode core in a third direction. The positive electrode plates include positive electrode foil materials and positive electrode active material layers disposed on the positive electrode foil materials, and the negative electrode plates include negative electrode foil materials and negative electrode active material layers disposed on the negative electrode foil materials. The conductive connection member includes a first conductive connection member and a second conductive connection member. The first conductive connection member and the second conductive connection member are oppositely arranged on the electrode core in a second direction. The second direction, the first direction, and the third direction are perpendicular to each other in pairs. The first conductive connection member is used for conducting the positive electrode tabs on the positive electrode plates and the positive electrode foil materials, and the second conductive connection member is used for conducting the negative electrode tabs on the negative electrode plates and the negative electrode foil materials.

3. The battery according to claim 2, wherein The electrode core has a first side surface and a second side surface oppositely arranged in the second direction. The first conductive connection member is mounted on the first side surface, and the second conductive connection member is mounted on the second side surface.

4. The battery according to claim 2, characterized in that, The positive electrode plates include a positive electrode coating region and a positive electrode empty foil region connected to each other. The positive electrode empty foil region is located on at least one side of the positive electrode coating region. The positive electrode empty foil regions of a plurality of the positive electrode plates are connected to form the first conductive connection member.

5. The battery according to claim 4, characterized in that, The positive electrode empty foil region includes a first positive electrode empty foil region and a second positive electrode empty foil region. The first positive electrode empty foil region is located at one end of the positive electrode coating region in the third direction. One end of the second positive electrode empty foil region is connected to the first positive electrode empty foil region, and the other end of the second positive electrode empty foil region extends in the third direction away from one end of the first positive electrode empty foil region.

6. The battery according to claim 2, characterized in that, The negative electrode plates include a negative electrode coating region and a negative electrode empty foil region connected to each other. The negative electrode empty foil region is located on one side of the negative electrode coating region. The negative electrode empty foil regions of a plurality of the negative electrode plates are connected to form the second conductive connection member.

7. The battery according to claim 6, wherein, The negative electrode empty foil region includes a first negative electrode empty foil region and a second negative electrode empty foil region. The first negative electrode empty foil region is located at one end of the negative electrode coating region in the third direction. One end of the second negative electrode empty foil region is connected to the first negative electrode empty foil region, and the other end of the second negative electrode empty foil region extends in the third direction away from one end of the first negative electrode empty foil region.

8. The battery according to claim 2, characterized in that, The separator is in a "Z" shape, and the positive electrode plates and the negative electrode plates are disposed on opposite sides of the separator.

9. The battery according to claim 2, wherein The first conductive connection member and the negative electrode sheet are separated by the separator, and the second conductive connection member and the positive electrode sheet are separated by the separator.

10. The battery according to claim 1, characterized in that, A metal layer is provided on a side of the conductive connection member close to the electrode core.

11. The battery according to claim 1, characterized in that, An insulating member is further included. The conductive connection member is a metal member, and the insulating member is disposed between the conductive connection member and the inner surface of the housing.

12. The battery according to claim 10 or 11, characterized in that, The conductive connection member includes a first connection member and a second connection member. One end of the first connection member is connected to the tab, one end of the second connection member is connected to the other end of the first connection member, and the other end of the second connection member extends toward an end of the electrode sheet away from the tab.

13. The battery according to claim 10 or 11, characterized in that, A conductive layer is further included, and the conductive layer is disposed between the conductive connection member and the electrode core.

14. A battery pack, characterized in that, A battery according to any one of claims 1-13 is included.

15. An electrical device, characterized in that, A battery pack according to claim 14 is included.

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