CN220796848U - Battery assembly - Google Patents

Abstract

The utility model discloses a battery assembly, which comprises: a housing in which an accommodation space is provided; the battery cell is arranged in the accommodating space and comprises a positive plate and a negative plate; the extraction piece comprises a positive electrode extraction piece and a negative electrode extraction piece, one end of the negative electrode extraction piece is electrically connected with the negative electrode plate, one end of the positive electrode extraction piece is electrically connected with the positive electrode plate, and the other end of the positive electrode extraction piece extends upwards and stretches out of the accommodating space; and the charging circuit board is arranged above the shell and is respectively electrically connected with the other end of the positive electrode lead-out piece and the negative electrode lead-out piece. Therefore, one end of the positive electrode lead-out piece is electrically connected with the positive electrode plate, and the other end of the positive electrode lead-out piece is electrically connected with the charging circuit board, so that the structure of the battery assembly can be simplified on the premise of ensuring that the battery core is in circuit communication with the charging circuit board, the production of the battery assembly is facilitated, and the production cost of the battery assembly is reduced.

Description

Battery assembly

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery assembly.

Background

The lithium ion battery is widely used because of the characteristics of high energy density and long cycle life, most of the existing primary batteries are nickel-cadmium, lead-acid, nickel-hydrogen and other batteries, and the materials used by the batteries have great environmental pollution, so that the lithium ion secondary battery is gradually replacing the traditional primary battery.

In the prior art, a rechargeable battery is required to be provided with a charging device such as a PCB (printed circuit board) and a charging interface, however, the battery is only provided with a discharging contact, the charging device is required to be externally arranged on a battery core, and a top cover is required to be arranged to fix the charging device in a battery structure, so that the assembly mode is complex, and the preparation cost of the battery is increased.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a battery assembly, which can reduce the production difficulty and the cost.

A battery pack according to an embodiment of the present utility model includes: a housing in which an accommodation space is provided; the battery cell is arranged in the accommodating space and comprises a positive plate and a negative plate; the extraction piece comprises a positive electrode extraction piece and a negative electrode extraction piece, one end of the negative electrode extraction piece is electrically connected with the negative electrode plate, one end of the positive electrode extraction piece is electrically connected with the positive electrode plate, and the other end of the positive electrode extraction piece extends upwards and extends out of the accommodating space; and the charging circuit board is arranged above the shell and is respectively electrically connected with the other end of the positive electrode lead-out piece and the negative electrode lead-out piece.

Therefore, one end of the positive electrode lead-out piece is electrically connected with the positive electrode plate, and the other end of the positive electrode lead-out piece is electrically connected with the charging circuit board, so that the structure of the battery assembly can be simplified on the premise of ensuring that the battery core is in circuit communication with the charging circuit board, the production of the battery assembly is facilitated, and the production cost of the battery assembly is reduced.

According to some embodiments of the utility model, the positive plate comprises a positive dressing region and a positive empty foil region, the positive empty foil region extends in the vertical direction of the positive plate, the positive dressing region is arranged outside the positive empty foil region, and the positive lead-out piece is electrically connected with the positive empty foil region.

According to some embodiments of the utility model, one end of the positive electrode lead-out piece is welded and fixed with the positive electrode empty foil area; and/or one end of the positive electrode lead-out piece is adhered and fixed with the positive electrode empty foil area; and/or one end of the positive electrode lead-out piece is riveted and fixed with the positive electrode empty foil area.

According to some embodiments of the utility model, the length of the positive electrode blank foil area in the up-down direction is L1, the length of the positive electrode sheet in the up-down direction is L2, and L1 and L2 satisfy the relation: l1 is less than or equal to L2.

According to some embodiments of the utility model, the negative electrode tab is electrically connected to the housing, and one end of the negative electrode lead is electrically connected to the housing.

According to some embodiments of the utility model, the negative electrode sheet comprises a negative electrode dressing area and a negative electrode empty foil area, the negative electrode dressing area is arranged on the surfaces of the two radial sides of the negative electrode sheet, the negative electrode empty foil area is positioned at one end of the negative electrode dressing area in the upper-lower direction, and the negative electrode empty foil area and the shell are electrically connected with each other; and/or the negative electrode dressing area is arranged on the surface of one radial side of the negative electrode sheet, the negative electrode empty foil area is arranged on the surface of the other radial side of the negative electrode sheet, and the negative electrode empty foil area and the shell are mutually and electrically connected.

According to some embodiments of the utility model, the negative foil region is arranged extending in the circumferential direction of the negative dressing region; and/or the number of the negative electrode empty foil areas is multiple, and the multiple negative electrode empty foil areas are arranged at intervals in the circumferential direction of the negative electrode dressing area.

According to some embodiments of the utility model, the battery assembly further comprises a sealing member, the upper side of the housing is arranged in an open manner, the sealing member is arranged in the accommodating space and is positioned at the upper end of the battery cell so as to seal the upper side of the housing, and the other end of the positive electrode lead-out member penetrates through the sealing member and extends out of the accommodating space.

According to some embodiments of the utility model, the seal is an interference fit with the positive lead.

According to some embodiments of the utility model, the seal comprises a first seal part and a second seal part, the first seal part is arranged on the upper side of the second seal part, the cross section area of the first seal part is larger than that of the second seal part, the shell is provided with a first abutting part and a second abutting part, the first abutting part is arranged in a protruding mode towards the second seal part and is in abutting fit with the lower side of the first seal part, and the second abutting part is arranged on the top of the shell and is in abutting fit with the upper side of the first seal part.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a partial exploded view of a battery assembly according to an embodiment of the present utility model;

fig. 2 is a cross-sectional view of a battery assembly according to an embodiment of the present utility model;

fig. 3 is a partial cross-sectional view of a battery assembly according to an embodiment of the present utility model;

fig. 4 is a partial schematic view of a battery assembly according to an embodiment of the present utility model;

FIG. 5 is a schematic illustration of a positive plate according to some embodiments of the utility model;

FIG. 6 is a schematic view of a positive plate according to further embodiments of the present utility model;

FIG. 7 is a schematic illustration of a negative plate according to some embodiments of the utility model;

FIG. 8 is a schematic view of a negative plate according to further embodiments of the present utility model;

fig. 9 is a schematic diagram of a cell according to some embodiments of the utility model;

fig. 10 is a schematic diagram of a cell according to further embodiments of the present utility model;

fig. 11 is a cross-sectional view of a cell according to some embodiments of the utility model;

fig. 12 is a cross-sectional view of a cell according to further embodiments of the present utility model.

Reference numerals:

100. a battery assembly;

10. a housing; 11. an accommodation space; 12. a first abutting portion; 13. a second abutting portion;

20. a battery cell; 21. a positive plate; 211. a positive electrode dressing region; 212. a positive electrode empty foil region; 22. a negative electrode sheet; 221. a negative electrode dressing region; 222. a negative electrode empty foil region; 2221. a negative electrode ear; 23. a diaphragm;

30. a lead-out member; 31. a positive electrode lead;

40. a charging circuit board;

50. a seal; 51. a first sealing part; 52. a second sealing part;

60. an insulating cover; 61. the clamping bulge; 62. a charging member; 621. a charging interface; 63. a first avoidance port; 64. an anode cap; 65. an insulating member; 66. a second avoidance port;

70. an insulating film.

Detailed Description

Embodiments of the present utility model will be described in detail below, by way of example with reference to the accompanying drawings.

A battery assembly 100 according to an embodiment of the present utility model is described below with reference to fig. 1 to 12.

As shown in connection with fig. 1 to 12, a battery assembly 100 according to the present utility model may mainly include: the battery pack comprises a shell 10, a battery cell 20, a lead-out piece 30 and a charging circuit board 40, wherein an accommodating space 11 is arranged in the shell 10, so that the shell 10 has certain energy storage capacity, the battery cell 20 is convenient to set in the battery pack 100, the battery cell 20 is arranged in the accommodating space 11, the shell 10 can provide a stable and reliable assembly position for the battery cell 20, the shell 10 can protect the battery cell 20, and the structural reliability and the working safety of the battery cell 20 in the battery pack 100 are ensured. In addition, the battery cell 20 includes a positive plate 21, a negative plate 22 and a diaphragm 23, the diaphragm 23 is disposed between the positive plate 21 and the negative plate 22, so that the battery assembly 100 can be ensured to have a certain battery capacity and cycle life, and the normal operation of the charge and discharge functions of the battery assembly 100 can be ensured, and the positive plate 21, the diaphragm 23 and the negative plate 22 form the battery cell 20 in a winding manner. In embodiments of the present utility model, the housing 10 may include, but is not limited to, a metal housing such as a steel shell, which may ensure the electrical conductivity of the housing 10.

Further, the lead-out member 30 includes a positive electrode lead-out member 31 and a negative electrode lead-out member, one end of the negative electrode lead-out member is electrically connected to the negative electrode tab 22, one end of the positive electrode lead-out member 31 is electrically connected to the positive electrode tab 21, and the other end extends upward and protrudes from the accommodation space 11. Specifically, the positive electrode lead-out piece 31 and the negative electrode lead-out piece are respectively electrically connected with the positive electrode plate 21 and the negative electrode plate 22, so that the positive electrode and the negative electrode of the battery cell 20 can be conveniently connected with other structures in the battery assembly 100 on the premise of ensuring that the structures of the positive electrode plate 21 and the negative electrode plate 22 are reliable, the circuit connection in the battery assembly 100 is convenient, and the assembly convenience of the battery assembly 100 can be further improved.

Further, a charging circuit board 40 is provided above the case 10 and is electrically connected to the other end of the positive electrode lead-out member 31 and the negative electrode lead-out member, respectively. Specifically, the charging circuit board 40 is disposed above the housing 10, so that the structure of the battery assembly 100 can be more compact, the charging circuit board 40 is electrically connected with the battery cell 20, the other end of the positive electrode lead-out member 31 and the negative electrode lead-out member are electrically connected with the charging circuit board 40, and the circuit connectivity among the positive electrode lead-out member 31, the negative electrode lead-out member and the charging circuit board 40 can be ensured, so that the circuit connectivity between the battery cell 20 and the charging circuit board 40 can be further ensured.

Compared with the prior art, the battery cell and the charging circuit board need to be provided with the positive electrode connecting cover, one end of the positive electrode leading-out piece is connected with the positive electrode connecting end on the positive electrode connecting cover, and the other end of the positive electrode leading-out piece is connected with the positive electrode connecting end on the charging circuit board, so that the circuit communication between the battery cell and the charging circuit board can be realized. In the embodiment of the present utility model, one end of the positive electrode lead-out member 31 is directly electrically connected to the positive electrode tab 21, and the other end extends upward and protrudes from the receiving space 11 to be directly connected to the charging circuit board 40, so that the structure of the prior art positive electrode connection cover and the like can be omitted, the structure of the battery assembly 100 can be simplified, the manufacturing difficulty of the battery assembly 100 can be reduced, and the production cost of the battery assembly 100 can be reduced.

As shown in fig. 5 to 6, the positive electrode sheet 21 includes a positive electrode dressing region 211 and a positive electrode empty foil region 212, the positive electrode empty foil region 212 extends in the up-down direction of the positive electrode sheet 21, the positive electrode dressing region 211 is disposed outside the positive electrode empty foil region 212, and the positive electrode lead-out member 31 is electrically connected to the positive electrode empty foil region 212. Specifically, the positive plate 21 is provided with the positive electrode dressing area 211, the positive electrode dressing area 211 is coated with an active material, energy can be provided for charging and discharging of the battery assembly 100, the positive electrode dressing area 211 is arranged on the outer side of the positive electrode empty foil area 212, so that the positive electrode empty foil area 212 is not coated with the active material and is only of a metal foil layer structure, the positive electrode empty foil area 212 extends in the up-down direction of the positive plate 21, the influence of the positive electrode empty foil area 212 on the structure of the positive plate 21 can be reduced, structural flatness of the positive plate 21 and the negative plate 22 after being attached can be guaranteed as much as possible, the positive electrode lead-out piece 31 and the positive electrode empty foil area 212 can be conveniently connected, and further the electrical connection reliability of the positive plate 21 and the positive electrode lead-out piece 31 can be guaranteed.

In the embodiment of the present utility model, the active material may be gap-coated on the positive electrode sheet 21 to form the positive electrode empty foil region 212 on the positive electrode sheet 21, or the active material may be continuously coated on the positive electrode sheet 21, and then the active material in a partial region on the positive electrode sheet 21 may be removed to form the positive electrode empty foil region 212 on the positive electrode sheet 21. In the embodiment of the present utility model, the manner of removing the active material of the partial region on the positive electrode sheet 21 includes, but is not limited to, laser removal or scraping.

According to some embodiments of the present utility model, one end of the positive electrode lead-out member 31 is welded to the positive electrode blank foil area 212. According to other embodiments of the present utility model, one end of the positive electrode lead-out member 31 is adhesively secured to the positive electrode blank foil area 212. According to further embodiments of the present utility model, one end of the positive electrode lead-out member 31 is riveted to the positive electrode blank foil area 212. Specifically, the connection manner of one end of the positive electrode lead-out member 31 and the positive electrode empty foil region 212 includes, but is not limited to, at least one of welding, bonding and riveting, and the connection manner of welding, bonding and riveting is simple in operation, can simplify the connection manner of the positive electrode lead-out member 31 and the positive electrode empty foil region 212, can also ensure that the connection strength of the positive electrode lead-out member 31 and the positive electrode empty foil region 212 meets the structural strength requirement of the battery assembly 100, can ensure the connection reliability of the positive electrode lead-out member 31 and the positive electrode empty foil region 212, and can further ensure the electrical connection reliability between the positive electrode sheet 21 and the charging circuit board 40.

As shown in fig. 5 to 6, the length of the positive electrode blank foil region 212 in the up-down direction is L1, the length of the positive electrode sheet 21 in the up-down direction is L2, and the lengths L1 and L2 satisfy the relation: l1 is less than or equal to L2. Specifically, the length of the positive electrode blank foil area 212 in the up-down direction is not longer than the length of the positive electrode plate 21 in the up-down direction, so that not only can the structural reliability of the positive electrode blank foil area 212 on the positive electrode plate 21 be ensured, but also the flatness of the structure of the positive electrode plate 21 in the up-down direction can be ensured, the positive electrode plate 21 is convenient to wind or stack, the positive electrode lead-out piece 31 can be conveniently connected with the positive electrode blank foil area 212, and the manufacturing difficulty of the battery assembly 100 can be reduced.

As shown in fig. 3, the negative electrode tab 22 is electrically connected to the case 10, and one end of the negative electrode lead is electrically connected to the case 10. Specifically, in the embodiment of the present utility model, the negative electrode sheet 22 is directly electrically connected with the casing 10, so that the casing 10 is used as a negative electrode in the battery assembly 100, the structure of the battery assembly 100 can be simplified, the production difficulty of the battery assembly 100 is reduced, and the negative electrode lead-out member is directly electrically connected with the casing 10.

According to some embodiments of the present utility model, as shown in fig. 7 to 10, the negative electrode sheet 22 includes a negative electrode dressing region 221 and a negative electrode empty foil region 222, the negative electrode dressing region 221 is disposed on the surface of both radial sides of the negative electrode sheet 22, the negative electrode empty foil region 222 is located at one end of the negative electrode dressing region 221 in the up-down direction, and the negative electrode empty foil region 222 is electrically connected to the case 10. Specifically, the surfaces of the two radial sides of the negative electrode sheet 22 are both provided with a negative electrode dressing area 221, the negative electrode dressing area 221 is coated with an active material, energy can be provided for charging and discharging of the battery assembly 100, the negative electrode empty foil area 222 is located at one end in the upper-lower direction of the negative electrode dressing area 221 and is far away from the positive electrode lead-out piece 31, so that the negative electrode empty foil area 222 can be conveniently arranged in the battery cell 20, the battery cell 20 is prevented from being short-circuited due to the direct connection of the negative electrode empty foil area 222 and the positive electrode lead-out piece 31, the negative electrode empty foil area 222 is electrically connected with the shell 10, the negative electrode sheet 22 and the shell 10 can be electrically connected, the circuit between the negative electrode sheet 22 and the shell 10 can be communicated, the shell 10 is used as the negative electrode of the battery assembly 100, and the structure of the battery assembly 100 can be simplified.

According to other embodiments of the present utility model, as shown in fig. 7 to 10, the negative electrode dressing region 221 is disposed on a surface of one side of the negative electrode sheet 22 in the radial direction, the negative electrode empty foil region 222 is disposed on a surface of the other side of the negative electrode sheet 22 in the radial direction, and the negative electrode empty foil region 222 is electrically connected to the case 10. Specifically, the surface of radial one side of negative electrode piece 22 is provided with negative electrode dressing district 221, is coated with the active material on the negative electrode dressing district 221, can provide energy for the charge and discharge of battery assembly 100, and the empty foil district 222 of negative electrode sets up in the surface of the radial opposite side of negative electrode piece 22, can make the empty foil district of estimation and casing 10 mutual electrical connection, guarantees the circuit intercommunication between negative electrode piece 22 and the casing 10, so set up, not only can reduce the degree of difficulty of coating the active material on negative electrode piece 22, simplify the production technology of negative electrode piece 22, but also can increase the area of the empty foil district 222 of negative electrode, improve the convenience and the reliability that the empty foil district 222 of negative electrode and casing 10 electricity are connected.

According to some embodiments of the present utility model, as shown in connection with fig. 7 and 9, the negative electrode blank foil region 222 is arranged extending in the circumferential direction of the negative electrode dressing region 221. Specifically, the negative electrode blank foil area 222 is arranged to extend in the circumferential direction of the negative electrode dressing area 221, so that the area of the negative electrode blank foil area 222 can be increased, after the negative electrode sheet 22 and the positive electrode sheet 21 are wound to form the battery cell 20, the negative electrode blank foil area 222 can be rubbed on one side end surface of the battery cell 20, so that one side end surface of the battery cell 20 is kept flat, and after the battery cell 20 is placed in the accommodating space 11, the negative electrode blank foil area 222 can be abutted to and conducted with the shell 10 at the bottom of the accommodating space 11, so that the shell 10 can become the negative electrode of the battery assembly 100 and is connected with an external circuit.

According to other embodiments of the present utility model, as shown in connection with fig. 8 and 10, the negative electrode blank foil region 222 is processed to form a plurality of negative electrode tabs 2221 spaced apart in the circumferential direction of the negative electrode dressing region 221. Specifically, after the negative electrode sheet 22 and the positive electrode sheet 21 are wound to form the battery cell 20, the plurality of negative electrode tabs 2221 may be bent on one side end surface of the battery cell 20, so that one side end surface of the battery cell 20 is kept flat, after the battery cell 20 is placed in the accommodating space 11, the negative electrode empty foil region 222 may be abutted to and conducted with the case 10 at the bottom of the accommodating space 11, so that the case 10 may become a negative electrode of the battery assembly 100 and be connected with an external circuit. In an embodiment of the present utility model, the manner of processing the negative electrode blank foil area 222 into the negative electrode tab 2221 includes, but is not limited to, die cutting and cutting, and the number of the negative electrode tabs 2221 formed by processing may be set according to the specific structural requirements of the battery assembly 100, and the manner of connecting the negative electrode tab 2221 with the case 10 includes, but is not limited to, abutting, bonding and welding.

According to further embodiments of the present utility model, as shown in fig. 11 and 12, the positive electrode sheet 21, the separator 23 and the negative electrode sheet 22 are stacked and wound into the battery cell 20, and the negative electrode sheet 22 is terminated, so that it is ensured that the outermost ring of the battery cell 20 is the negative electrode sheet 22, after such battery cell 20 is placed in the case 10, electrolyte is injected into the accommodating space 11, swelling of the battery cell 20 occurs after the battery cell 20 is soaked in the electrolyte, and the outer ring of the battery cell 20 is in contact with and conducted with the inner wall of the case 10, so that the case 10 becomes the negative electrode of the battery assembly 100 and is connected with an external circuit. In the embodiment of the present utility model, the side of the outermost negative electrode sheet 22 of the battery cell 20 facing the case 10 may be coated with an active material and may be in contact with the case 10, or the metal foil layer of the negative electrode sheet 22 may be in direct contact with the case 10.

As shown in fig. 3 and 4, the upper side of the case 10 is opened, the sealing member 50 is disposed in the receiving space 11 and at the upper end of the battery cell 20 to seal the upper side of the case 10, and the other end of the positive electrode lead-out member 31 penetrates the sealing member 50 and protrudes from the receiving space 11. Specifically, the upper side of the case 10 is opened, so that the battery cell 20 and the electrolyte can be conveniently disposed in the accommodating space 11, the assembly operation of the battery assembly 100 is facilitated, after the battery cell 20 and the electrolyte are both disposed in the case 10, the sealing member 50 can be disposed in the accommodating space 11, and the sealing member 50 is disposed at the upper end of the battery cell 20, so that the sealing member 50 seals the upper open end of the case 10, and thus, not only can moisture and air outside the case 10 be prevented from entering the accommodating space 11 to affect the normal operation of the battery cell 20, but also the electrolyte can be prevented from flowing out of the case 10, the electrolyte of the battery assembly 100 is prevented from leaking, other structural members in the battery assembly 100 are corroded, and one end of the positive electrode lead-out member 31, which is far from the positive electrode tab 21, can pass through the sealing member 50 and protrude from the accommodating space 11, so that the positive electrode lead-out member 31 is connected with the charging circuit board 40.

According to the embodiment of the utility model, the sealing member 50 is in interference fit with the positive electrode lead-out member 31, so that on one hand, electrolyte can be prevented from flowing out of the casing 10, moisture and air outside the casing 10 can be prevented from entering the battery cell 20, sealing reliability of the casing 10 can be ensured, and on the other hand, the positive electrode lead-out member 31 can be fixed on the sealing member 50 while the positive electrode lead-out member 31 extends out of the accommodating space 11 and passes through the sealing member 50, so that structural stability of the positive electrode lead-out member 31 in the battery assembly 100 can be improved, connection reliability of the positive electrode lead-out member 31 and the charging circuit board 40 can be improved, and therefore, the structure of the battery assembly 100 can be more reliable, and circuit communication of the battery assembly 100 can be more stable.

As shown in fig. 3, the seal 50 includes a first seal portion 51 and a second seal portion 52, the first seal portion 51 is provided on an upper side of the second seal portion 52, a cross-sectional area of the first seal portion 51 is larger than that of the second seal portion 52, the housing 10 is provided with a first abutting portion 12 and a second abutting portion 13, the first abutting portion 12 is provided protruding toward the second seal portion 52 and is in abutting engagement with a lower side of the first seal portion 51, and the second abutting portion 13 is provided on a top of the housing 10 and is in abutting engagement with an upper side of the first seal portion 51. Specifically, the sealing member 50 is provided with two parts, wherein the first sealing portion 51 is located at the upper side of the second sealing portion 52, and the cross-sectional area of the first sealing portion 51 is larger than that of the second sealing portion 52, so that the sealing member 50 can be conveniently matched with the housing 10 in the accommodating space 11, the first abutting portion 12 on the housing 10 is convexly arranged towards the second sealing portion 52, so that the first abutting portion 12 can be in abutting fit with the lower side of the first sealing portion 51, the sealing member 50 can be ensured to be located in the accommodating space 11, and the upper end of the battery cell 20 is stably arranged.

Further, after the sealing member 50 is placed into the accommodating space 11 and the lower side of the first sealing portion 51 is in abutting engagement with the first abutting portion 12, the upper end of the housing 10 may be mechanically punched, so that the upper end circumferential edge of the housing 10 may be bent towards the center of the battery cell 20 to form the second abutting portion 13, the second abutting portion 13 is in abutting engagement with the upper side of the first sealing portion 51, the second sealing portion 52 may be pressed towards the direction of the battery cell 20, and the second sealing portion 52 is in abutting engagement with the battery cell 20, so that the upper end of the housing 10 may be sealed to ensure the sealing effect of the housing 10, and on the other hand, the second abutting portion 13 may press the negative electrode hollow foil region 222 at the bottom of the battery cell 20 towards the bottom of the housing 10 while pressing the battery cell 20, so as to enhance the connection reliability of the negative electrode hollow foil region 222 at the bottom of the battery cell 20 and the housing 10, so that the structural reliability and the circuit communication stability of the battery assembly 100 may be further improved.

As shown in fig. 2, the upper end of the housing 10 is sleeved with an insulating cover 60, one end of the insulating cover 60 facing the housing 10 is circumferentially provided with a clamping protrusion 61, and the clamping protrusion 61 is matched with the first abutting portion 12 in a clamping manner, so that the insulating cover 60 and the housing 10 can be assembled conveniently, and in actual operation, the clamping protrusion 61 and the first abutting portion 12 can be bonded to enhance the connection stability between the insulating cover 60 and the housing 10. The charging circuit board 40 sets up in the top of casing 10 to with insulating cover 60 inner wall butt cooperation, one side fixedly connected with charging member 62 that casing 10 was kept away from to charging circuit board 40 is provided with the interface 621 that charges on the charging member 62, insulating cover 60 is provided with first mouthful 63 of dodging in the position that corresponds the interface 621 that charges, can guarantee that external charging connector passes first mouthful 63 and dodges smoothly and be connected with the interface 621 that charges, charging member 62 is connected with the charging circuit electricity on the charging circuit board 40, and anodal drawing member 31 and negative pole drawing member all are connected with the charging circuit on the charging circuit board 40, thereby can make external power supply charge to electric core 20, can make battery pack 100 cyclic utilization.

Further, the upper end of the insulating cover 60 is provided with the positive cap 64, the positive cap 64 is electrically connected with the charging circuit board 40, and an insulating member 65 is arranged between the positive cap 64 and the charging member 62, so that the positive plate 21 is communicated with the positive cap 64 through the positive lead-out member 31 and the charging circuit board 40, the positive cap 64 becomes the positive electrode of the battery assembly 100 and is connected with an external circuit, the positive cap 64 and the charging member 62 can be prevented from being directly connected to cause the battery assembly 100 to be short-circuited, the safety of the battery assembly 100 during operation can be ensured, the position, corresponding to the positive cap 64, of the top of the insulating cover 60 is provided with the second avoidance opening 66, the positive cap 64 at least partially extends upwards from the second avoidance opening 66, and the positive cap 64 can be conveniently connected with the external circuit.

As shown in fig. 1, the battery assembly 100 further includes an insulating film 70, the insulating film 70 has insulating properties, and the insulating film 70 is wrapped on the outer sides of the battery core 20 and the insulating cover 60, so that the battery assembly 100 can be prevented from being electrically leaked in contact with the external environment, the battery assembly 100 can be protected, the insulating cover 60 and the housing 10 can be completely fixed, the structural integrity of the battery assembly 100 can be improved, and the battery assembly 100 can be conveniently stored and used. In addition, the insulating film 70 avoids the first avoiding opening 63 and the second avoiding opening 66, so that the charging interface 621 can be smoothly connected with an external circuit, and the positive electrode cap 64 can be normally connected with the external circuit.

According to the embodiment of the utility model, the battery assembly 100 can be applied to batteries of different types, including but not limited to a No. 5 battery and a No. 7 battery, and the No. 5 or the No. 7 battery provided with the battery assembly 100 in the embodiment of the utility model has the advantages of simpler battery structure, more convenient assembly operation and reduced preparation cost of the battery.

In the description of the present utility model, 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", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A battery assembly, comprising:

a housing (10), wherein an accommodating space (11) is arranged in the housing (10);

the battery cell (20) is arranged in the accommodating space (11) and comprises a positive electrode plate (21) and a negative electrode plate (22);

the extraction piece (30), the extraction piece (30) comprises a positive electrode extraction piece (31) and a negative electrode extraction piece, one end of the negative electrode extraction piece is electrically connected with the negative electrode plate (22), one end of the positive electrode extraction piece (31) is electrically connected with the positive electrode plate (21), and the other end extends upwards and protrudes from the accommodating space (11);

and the charging circuit board (40) is arranged above the shell (10) and is electrically connected with the other end of the positive electrode lead-out piece (31) and the negative electrode lead-out piece respectively.

2. The battery assembly according to claim 1, wherein the positive electrode sheet (21) includes a positive electrode dressing region (211) and a positive electrode empty foil region (212), the positive electrode empty foil region (212) is provided extending in an up-down direction of the positive electrode sheet (21), the positive electrode dressing region (211) is provided outside the positive electrode empty foil region (212), and the positive electrode lead-out member (31) is electrically connected with the positive electrode empty foil region (212).

3. The battery assembly according to claim 2, wherein one end of the positive electrode lead-out member (31) is welded and fixed to the positive electrode empty foil region (212); and/or

One end of the positive electrode lead-out piece (31) is adhered and fixed with the positive electrode empty foil area (212); and/or

One end of the positive electrode lead-out piece (31) is riveted and fixed with the positive electrode empty foil area (212).

4. The battery assembly according to claim 2, wherein the positive electrode blank foil region (212) has a length L1 in the up-down direction, the positive electrode sheet (21) has a length L2 in the up-down direction, and the lengths L1 and L2 satisfy the relation: l1 is less than or equal to L2.

5. The battery assembly according to claim 1, wherein the negative electrode tab (22) is electrically connected to the case (10), and one end of the negative electrode lead-out member is electrically connected to the case (10).

6. The battery assembly according to claim 5, wherein the negative electrode sheet (22) includes a negative electrode dressing region (221) and a negative electrode empty foil region (222), the negative electrode dressing region (221) being provided on surfaces of both radial sides of the negative electrode sheet (22), the negative electrode empty foil region (222) being located at one end in an up-down direction of the negative electrode dressing region (221), the negative electrode empty foil region (222) and the case (10) being electrically connected to each other; and/or

The negative electrode dressing area (221) is arranged on the surface of one radial side of the negative electrode sheet (22), the negative electrode empty foil area (222) is arranged on the surface of the other radial side of the negative electrode sheet (22), and the negative electrode empty foil area (222) and the shell (10) are electrically connected with each other.

7. The battery assembly according to claim 6, wherein the negative electrode blank foil region (222) is arranged extending in the circumferential direction of the negative electrode dressing region (221); and/or

The number of the negative electrode empty foil areas (222) is plural, and the plurality of the negative electrode empty foil areas (222) are arranged at intervals in the circumferential direction of the negative electrode dressing area (221).

8. The battery assembly according to claim 1, further comprising a sealing member (50), wherein the upper side of the case (10) is disposed open, the sealing member (50) is disposed in the accommodating space (11) and located at the upper end of the battery cell (20) to seal the upper side of the case (10), and the other end of the positive electrode lead-out member (31) penetrates the sealing member (50) and protrudes from the accommodating space (11).

9. The battery assembly of claim 8, wherein the seal (50) is an interference fit with the positive lead (31).

10. The battery assembly according to claim 8, wherein the seal member (50) includes a first seal portion (51) and a second seal portion (52), the first seal portion (51) is provided at an upper side of the second seal portion (52), a cross-sectional area of the first seal portion (51) is larger than a cross-sectional area of the second seal portion (52), the case (10) is provided with a first abutting portion (12) and a second abutting portion (13), the first abutting portion (12) is provided protruding toward the second seal portion (52) and is in abutting engagement with a lower side of the first seal portion (51), and the second abutting portion (13) is provided at a top of the case (10) and is in abutting engagement with an upper side of the first seal portion (51).