Single battery and battery pack

Abstract

The utility model discloses a single battery and a battery pack, and relates to the field of batteries. The single battery comprises a battery cell, a first current collector, a pole assembly and a wire assembly. The first current collector comprises a disc body part, a central part and a fusing part, the central part is arranged in the inner circumferential direction of the disc body part, a gap is formed between the central part and the disc body part, the fusing part is arranged in the gap and connected with the disc body part and the central part, and one end of the battery cell is electrically connected with the disc body part; the pole assembly comprises a first pole and a second pole, the first pole is electrically connected with the central part, the second pole is electrically connected with the disc body part, and the second pole is insulated from the first pole; the wire assembly comprises a first wire and a second wire, the first wire is electrically connected with the first pole, the second wire is electrically connected with the second pole and the first wire, and the second wire is provided with a one-way conduction piece. According to the single battery provided by the invention, the safety performance is guaranteed, and the temperature in a high-rate charging process is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a single battery and a battery pack. BACKGROUND

[0002] With the continuous development of new energy vehicles and energy storage industries, the energy density and safety of batteries for current new energy vehicles and energy storage devices are increasingly demanding. When a battery triggers an external short circuit, it is easy to cause thermal runaway of the battery, leading to fire and explosion of the battery, which poses a great threat to personal safety and property safety.

[0003] To improve the safety of new energy vehicles and energy storage devices, the battery is usually provided with a fuse structure to quickly cut off the current when the battery has an external short circuit, thereby preventing the battery from causing thermal runaway and triggering a safety accident. However, with the development of fast charging technology, due to the small overcurrent cross section of the fuse structure, the temperature of the battery is too high during high-rate charging, which affects the performance of the battery. CONTENT OF THE UTILITY MODEL

[0004] To achieve the above-mentioned purpose, the present application has the purpose of providing a single battery and a battery pack to solve the technical problem of the small overcurrent cross section of the battery fuse structure in the prior art, which leads to the high temperature of the battery during high-rate charging and affects the performance of the battery.

[0005] The technical scheme adopted is as follows:

[0006] In a first aspect, the embodiments of the present application provide a single battery, comprising:

[0007] a cell;

[0008] a first current collector, the first current collector comprising a disc body portion, a center portion and a fuse portion, the center portion being arranged at the inner periphery of the disc body portion and having a gap with the disc body portion, the fuse portion being arranged in the gap and connected with the disc body portion and the center portion respectively, one end of the cell being electrically connected with the disc body portion;

[0009] a pole assembly, the pole assembly comprising a first pole and a second pole, the first pole being electrically connected with the center portion, the second pole being electrically connected with the disc body portion, and the second pole being insulated from the first pole;

[0010] a wire assembly, the wire assembly comprising a first wire and a second wire, the first wire being electrically connected with the first pole, two ends of the second wire being respectively electrically connected with the second pole and the first wire, and a one-way conduction member being arranged on the second wire, the one-way conduction member being used for one-way conduction of the current flowing from the second wire to the second pole.

[0011] In one of the embodiments of the first aspect, the center portion is provided with an insulating layer towards one side of the battery cell.

[0012] In one of the embodiments of the first aspect, the fusing portion is provided with an insulating layer towards one side of the battery cell.

[0013] In one of the embodiments of the first aspect, the second pole post is provided with a through hole, and the first pole post is arranged in the through hole and insulated from the second pole post.

[0014] In one of the embodiments of the first aspect, the single battery further comprises a housing and a first insulating seal, the housing has an open-ended accommodating cavity, the battery cell is arranged in the accommodating cavity, the second pole post is arranged in the housing and closes the opening, and the first insulating seal is arranged between the outer circumferential wall of the first pole post and the inner wall of the through hole.

[0015] In one of the embodiments of the first aspect, the inner wall of the through hole is provided with a first limiting portion, and the outer circumferential wall of one end of the first insulating seal towards the battery cell is provided with a second limiting portion, the second limiting portion cooperates with the first limiting portion to limit the movement of the first insulating seal in the axial direction of the first pole post.

[0016] The inner circumferential wall of the first insulating seal is provided with a third limiting portion, and the outer circumferential wall of the first pole post is provided with a fourth limiting portion cooperating with the third limiting portion to limit the movement of the first pole post in the axial direction thereof.

[0017] In one of the embodiments of the first aspect, the first limiting portion has a first clamping groove arranged in the inner wall of the through hole, and at least part of the groove opening of the first clamping groove is towards the battery cell, and at least part of the second limiting portion is clamped into the first clamping groove.

[0018] The fourth limiting portion has a second clamping groove arranged in the circumferential direction of the first pole post, and at least part of the third limiting portion is clamped into the second clamping groove.

[0019] In one of the embodiments of the first aspect, the single battery further comprises a second insulating seal, the second insulating seal is arranged between the second pole post and the inner wall of the opening and abuts with the second pole post and the inner wall of the opening respectively.

[0020] In one of the embodiments of the first aspect, the housing has an end wall, the opening is arranged in the end wall, and the single battery further comprises an insulating member arranged between the disc portion and the end wall.

[0021] In one of the embodiments of the first aspect, the monomer battery further comprises a second current collector opposite to the first current collector in polarity, the second current collector is electrically connected with the battery cell, and the second current collector is located at the end of the battery cell away from the first current collector, and the second current collector is electrically connected with the shell.

[0022] In one of the embodiments of the first aspect, a plurality of the fusing portions are provided, and the plurality of the fusing portions are arranged at intervals along the inner periphery of the disc body.

[0023] In the second aspect, the embodiments of the present application further provide a battery pack comprising the monomer battery in any of the embodiments.

[0024] The beneficial effects of the present application are as follows: the present application provides a monomer battery, the center portion is arranged at the inner periphery of the disc body and has a gap with the disc body, the fusing portion is arranged in the gap and connected with the disc body and the center portion respectively, one end of the battery cell is electrically connected with the disc body, the first pole is electrically connected with the center portion, and the first wire is electrically connected with the first pole. In the discharging process of the monomer battery, the current of the battery cell flows through the disc body, the fusing portion, the center portion, the first pole and the first wire in turn, and is finally output from the first wire, while when an external short circuit is triggered by accident, the current can be quickly cut off under the action of the fusing portion, thereby avoiding thermal runaway of the monomer battery and effectively ensuring the safety of the monomer battery.

[0025] Meanwhile, the second pole and the second wire are added, the second pole is electrically connected with the disc body and insulated from the first pole, the second wire is electrically connected with the second pole and the first wire respectively, and a unidirectional conduction member for unidirectionally conducting the current flowing from the second wire to the second pole is arranged on the second wire. In this way, in the discharging process of the monomer battery, the discharging current of the battery cell can be prevented from flowing through the disc body, the second pole and the second wire to the first wire under the blocking action of the unidirectional conduction member, so that the discharging current can only flow through the disc body, the fusing portion, the center portion and the first pole to the first wire, thereby ensuring the function of the fusing portion to quickly cut off the current when an external short circuit is triggered, and effectively ensuring the safety of the monomer battery. In the charging process of the monomer battery, the current enters through the first wire, then part of the charging current can flow through the first wire, the first pole, the center portion, the fusing portion and the disc body to the battery cell to charge the battery cell, and under the unidirectional conduction of the unidirectional conduction member, the other part of the charging current can flow through the first wire, the second wire, the second pole and the disc body to the battery cell to charge the battery cell, thereby sharing part of the charging current for the charging path flowing through the fusing portion, achieving the effect of current sharing, effectively reducing the charging current flowing through the fusing portion, and thereby effectively reducing the temperature of the monomer battery in the process of large-rate charging, avoiding the influence of high temperature on the performance of the monomer battery. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0027] Figure 1 A perspective partially exploded schematic view of a single battery in some embodiments of the present application is shown.

[0028] Figure 2 Another perspective partially exploded schematic view of a single battery in some embodiments of the present application is shown.

[0029] Figure 3 A front view schematic view of a single battery in some embodiments of the present application is shown.

[0030] Figure 4 An enlarged sectional view schematic view of the structure of A in FIG. 1 is shown. Figure 3

[0031] Figure 5 A three-dimensional schematic view of the first current collector in some embodiments of the present application is shown.

[0032] Main element symbol explanation:

[0033] 100-single battery; 110-housing; 111-opening; 112-receiving cavity; 113-end wall; 120-battery core; 130-first current collector; 131-disk body part; 132-center part; 133-fuse part; 134-insulating layer; 140-pole assembly; 141-first pole; 1411-fourth limiting part; 142-second pole; 1421-through hole; 14211-first limiting part; 150-wire assembly; 151-first wire; 152-second wire; 1521-one-way conducting part; 160-first insulating sealing part; 161-second limiting part; 162-third limiting part; 170-second insulating sealing part; 180-insulating part. DETAILED DESCRIPTION

[0034] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and should not be understood as a limitation to the present application.

[0035] ​In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0036] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0037] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0039] As shown in Figure 1 and Figure 2 Embodiments of the present application provide a single battery 100, mainly applied to a battery pack, and the battery pack is mainly applied to an electric device. The single battery 100 comprises an electric core 120, a first current collector 130, a pole assembly 140 and a wire assembly 150.

[0040] The battery cell 120 can be a cylindrical battery cell or a square battery cell, etc. The first current collector 130 can be a positive electrode current collector or a negative electrode current collector.

[0041] Referring to Figure 3 , Figure 4 and Figure 5 , the first current collector 130 includes a disc body part 131, a center part 132, and a fuse part 133. The center part 132 is arranged at an inner periphery of the disc body part 131, and has a gap with the disc body part 131. The fuse part 133 is arranged in the gap and connected with the disc body part 131 and the center part 132 respectively. One end of the battery cell 120 is electrically connected with the disc body part 131.

[0042] The pole assembly 140 includes a first pole 141 and a second pole 142. The first pole 141 is electrically connected with the center part 132. The second pole 142 is electrically connected with the disc body part 131, and is insulated from the first pole 141.

[0043] The wire assembly 150 includes a first wire 151 and a second wire 152. The first wire 151 is electrically connected with the first pole 141. Two ends of the second wire 152 are respectively electrically connected with the second pole 142 and the first wire 151. The second wire 152 is provided with a one-way conducting part 1521 for one-way conducting of the current flowing from the second wire 152 to the second pole 142.

[0044] The single battery 100 provided by the embodiment has the center part 132 arranged at the inner periphery of the disc body part 131 and having a gap with the disc body part 131. The fuse part 133 is arranged in the gap and connected with the disc body part 131 and the center part 132 respectively. One end of the battery cell 120 is electrically connected with the disc body part 131. The first pole 141 is electrically connected with the center part 132. The first wire 151 is electrically connected with the first pole 141. In this way, during discharging of the single battery 100, the discharging current of the battery cell 120 flows through the disc body part 131, the fuse part 133, the center part 132, the first pole 141, and the first wire 151 in sequence, and is finally output from the first wire 151. Thus, when an external short circuit is triggered due to an accident, the current can be quickly cut off under the action of the fuse part 133, so as to avoid thermal runaway of the single battery 100, and effectively ensure the safety of the single battery 100.

[0045] Meanwhile, the second pole 142 and the second wire 152 are added, the second pole 142 is electrically connected with the disc body 131 and insulated from the first pole 141, the second wire 152 is electrically connected with the second pole 142 and the first wire 151 respectively, and the one-way conducting piece 1521 for unidirectional conduction of the current flowing from the second wire 152 to the second pole 142 is arranged on the second wire 152. In this way, during the discharging process of the single battery 100, the discharging current of the battery cell 120 can be prevented from flowing to the first wire 151 through the disc body 131, the second pole 142 and the second wire 152 in turn under the blocking effect of the one-way conducting piece 1521, so that the discharging current can only flow to the first wire 151 through the disc body 131, the fuse part 133, the center part 132 and the first pole 141 in turn, thereby ensuring the function of the fuse part 133 to quickly cut off the current when an external short circuit is triggered, and effectively ensuring the safety of the single battery 100.

[0046] During the charging process of the single battery 100, the current enters through the first wire 151, then a part of the charging current can flow to the battery cell 120 through the first wire 151, the first pole 141, the center part 132, the fuse part 133 and the disc body 131 in turn to charge the battery cell 120, and another part of the charging current can flow to the battery cell 120 through the first wire 151, the second wire 152, the second pole 142 and the disc body 131 in turn to charge the battery cell 120 under the unidirectional conduction effect of the one-way conducting piece 1521, thereby sharing a part of the charging current for the charging path flowing through the fuse part 133, having a shunt effect, effectively reducing the charging current flowing through the fuse part 133, and further effectively reducing the temperature of the single battery 100 during the high-rate charging process, thereby avoiding high temperature affecting the performance of the single battery 100. That is, when the single battery 100 discharges, the one-way conducting piece 1521 blocks the discharging path of the battery cell 120 through the disc body 131, the second pole 142, the second wire 152 and the first wire 151 in turn, so that the current can only discharge through the disc body 131, the fuse part 133, the center part 132, the first pole 141 and the first wire 151 in turn, so that the fuse part 133 can play a protection role; when the single battery 100 charges, the one-way conducting piece 1521 can conduct the path from the second wire 152 to the second pole 142, so that the current flowing through the first wire 151 is divided into two paths, one path reaches the battery cell 120 through the first wire 151, the first pole 141, the center part 132, the fuse part 133 and the disc body 131 in turn, and the other path reaches the battery cell 120 through the first wire 151, the second wire 152, the second pole 142 and the disc body 131 in turn, thereby solving the problem of heating caused by the original single charging path. Figure 2 and Figure 4As shown in the drawings, in one embodiment of the present application, the center portion 132 is provided with an insulating layer 134 on the side facing the battery cell 120. The fuse portion 133 is provided with an insulating layer 134 on the side facing the battery cell 120.

[0047] In the present embodiment, by providing the insulating layer 134 on the side of the center portion 132 facing the battery cell 120, direct contact between the battery cell 120 and the center portion 132 is prevented during discharge of the single battery 100 due to the insulating effect of the insulating layer 134, so that the discharge path can only pass through the fuse portion 133, thereby ensuring that the fuse portion 133 can effectively respond and quickly cut off the current when an external short circuit is triggered.

[0048] Optionally, the insulating layer 134 can be an insulating coating applied to the side surface of the center portion 132 facing the battery cell 120, or an insulating film attached to the side surface of the center portion 132 facing the battery cell 120.

[0049] Optionally, the fuse portion 133 can be a fuse in the form of a wire or a sheet connected between the disc portion 131 and the center portion 132.

[0050] In other embodiments, the fuse portion 133 is also provided with an insulating layer 134 on the side facing the battery cell 120, so that direct contact between the battery cell 120 and the fuse portion 133 is prevented during discharge of the single battery 100 due to the insulating effect of the insulating layer 134, so that the discharge path can only pass from the disc portion 131 to the center portion 132 through the fuse portion 133, so that the discharge current completely passes through the fuse portion 133, further ensuring that the fuse portion 133 can quickly cut off the current when an external short circuit is triggered.

[0051] As shown in the drawings, Figure 1 and Figure 4 In one embodiment of the present application, the second pole 142 is provided with a through hole 1421, and the first pole 141 is arranged in the through hole 1421 and insulated from the second pole 142.

[0052] In the present embodiment, by providing the through hole 1421 on the second pole 142 and arranging the first pole 141 in the through hole 1421, the second pole 142 is arranged on the outer periphery of the first pole 141, effectively improving the space utilization of the single battery 100. At the same time, by insulating the first pole 141 from the second pole 142, contact between the first pole 141 and the second pole 142 is avoided to prevent short circuit and affect the safety of the single battery 100.

[0053] For example, the second pole column 142 and the first pole column 141 can be circular columns, and the through hole 1421 can be a hole passing through the second pole column 142 and having a size substantially equal to that of the first pole column 141, so as to better fit.

[0054] As shown in Figure 1 , Figure 3 and Figure 4 , in the above embodiment of the present application, the single battery 100 further comprises a housing 110 and a first insulation sealing member 160, the housing 110 has a containing cavity 112 with an open end 111, the electric core 120 is arranged in the containing cavity 112, the second pole column 142 is arranged on the housing 110 and closes the open end 111, and the first insulation sealing member 160 abuts between the outer circumferential wall of the first pole column 141 and the inner wall of the through hole 1421.

[0055] In the embodiment, by abutting the first insulation sealing member 160 between the outer circumferential wall of the first pole column 141 and the inner wall of the through hole 1421, on the one hand, the safety of the single battery 100 can be ensured by avoiding the short circuit caused by the contact between the first pole column 141 and the second pole column 142, and on the other hand, the gap between the outer circumferential wall of the first pole column 141 and the inner wall of the through hole 1421 can be sealed by the sealing effect of the first insulation sealing member 160, so as to avoid the leakage of the electrolyte in the containing cavity 112 through the gap between the outer circumferential wall of the first pole column 141 and the inner wall of the through hole 1421.

[0056] As shown in Figure 4 , in the above embodiment of the present application, the inner wall of the through hole 1421 is provided with a first limiting part 14211, and the outer circumferential wall of one end of the first insulation sealing member 160 towards the electric core 120 is provided with a second limiting part 161, the second limiting part 161 cooperates with the first limiting part 14211 to limit the movement of the first insulation sealing member 160 along the axial direction of the first pole column 141. The inner circumferential wall of the first insulation sealing member 160 is provided with a third limiting part 162, and the outer circumferential wall of the first pole column 141 is provided with a fourth limiting part 1411 cooperating with the third limiting part 162, so as to limit the movement of the first pole column 141 along its axial direction.

[0057] In the embodiment, the first limiting part 14211 is arranged on the inner wall of the through hole 1421, and the second limiting part 161 is arranged on the outer circumferential wall of one end of the first insulating sealing member 160 towards the battery cell 120, so as to limit the movement of the first insulating sealing member 160 along the axial direction of the first pole 141 relative to the second pole 142 under the limiting action of the first limiting part 14211 and the second limiting part 161, thereby avoiding the movement of the first insulating sealing member 160 along the axial direction of the first pole 141 to drive the synchronous movement of the first pole 141, resulting in the disengagement of the first pole 141 from the center part 132 and affecting the stability and reliability of the electrical connection between them.

[0058] Meanwhile, the third limiting part 162 is arranged on the inner circumferential wall of the first insulating sealing member 160, and the fourth limiting part 1411 is arranged on the outer circumferential wall of the first pole 141, so as to avoid the movement of the first pole 141 along the axial direction thereof relative to the first insulating sealing member 160 under the limiting action of the third limiting part 162 and the fourth limiting part 1411, resulting in the disengagement of the first pole 141 from the center part 132 and affecting the stability and reliability of the electrical connection between them.

[0059] It should be noted that the axial direction of the first pole 141 corresponds to the Z direction in the above-mentioned embodiments. Figure 4

[0060] In the above-mentioned embodiments of the present application, the first limiting part 14211 has a first clamping groove arranged on the inner wall of the through hole 1421, and at least part of the groove opening of the first clamping groove is towards the battery cell 120, and at least part of the second limiting part 161 is clamped into the first clamping groove. The fourth limiting part 1411 has a second clamping groove arranged on the circumferential direction of the first pole 141, and at least part of the third limiting part 162 is clamped into the second clamping groove.

[0061] ​In the embodiment, the first limiting part 14211 has a first clamping groove formed in the inner wall of the through hole 1421. At least part of the slot of the first clamping groove is directed towards the battery cell 120, and at least part of the second limiting part 161 is clamped into the first clamping groove. The movement of the first insulating sealing member 160 along the axial direction of the first pole 141 relative to the second pole 142 is limited under the clamping limiting action of the second limiting part 161 and the first clamping groove, thereby avoiding the movement of the first insulating sealing member 160 along the axial direction of the first pole 141 to drive the synchronous movement of the first pole 141, which causes the first pole 141 to be out of contact with the center part 132, thereby affecting the stability and reliability of the electrical connection between the two. At the same time, since the first pole 141 and the second pole 142 need to be insulated, at least part of the slot of the first clamping groove is directed towards the battery cell 120, which can increase the distance between the outer peripheral wall of the end of the first pole 141 close to the battery cell 120 and the inner peripheral wall of the end of the second pole 142 close to the battery cell 120, thereby preventing the first pole 141 and the second pole 142 from contacting each other at the position close to the battery cell 120 as much as possible, avoiding the direct discharge of current through the second pole 142 and the first pole 141 to bypass the fuse part 133, and ensuring the safety performance of the single battery 100.

[0062] As shown in the embodiment, Figure 4 the first clamping groove is a stepped groove formed in the end of the through hole 1421 close to the battery cell 120, and the second limiting part 161 is a step clamped into the first clamping groove. Alternatively, the through hole 1421 is a circular hole, the first clamping groove 1421 is an annular groove along the circumferential direction of the through hole 1421, and the second limiting part 161 can be an annular step provided on the outer periphery of the first insulating sealing member 160 or a plurality of steps arranged at intervals to limit the movement of the first insulating sealing member 160 away from the battery cell 120.

[0063] At the same time, the fourth limiting part 1411 has a second clamping groove formed in the circumferential direction of the first pole 141. At least part of the third limiting part 162 is clamped into the second clamping groove to avoid the movement of the first pole 141 along the axial direction thereof relative to the first insulating sealing member 160 under the clamping limiting action of the third limiting part 162 and the second clamping groove, thereby affecting the stability and reliability of the electrical connection between the two.

[0064] As shown in the embodiment, Figure 4 in the above-mentioned embodiments of the present application, the single battery 100 further comprises a second insulating sealing member 170 arranged between the second pole 142 and the inner wall of the opening 111, and abutting against the second pole 142 and the inner wall of the opening 111, respectively.

[0065] In the embodiment, by arranging the second insulation seal 170 between the second pole post 142 and the inner wall of the opening 111 and abutting against the second pole post 142 and the inner wall of the opening 111 respectively, on the one hand, the second pole post 142 can be prevented from contacting the shell 110 to cause short circuit and affect the safety of the single battery 100 under the insulation of the second insulation seal 170, and on the other hand, the gap between the second pole post 142 and the inner wall of the opening 111 can be sealed under the sealing of the second insulation seal 170, so as to prevent the electrolyte in the accommodating cavity 112 from leaking through the gap between the second pole post 142 and the inner wall of the opening 111.

[0066] In some other embodiments, as shown in FIG. 1C, the shell 110 has an end wall 113, the opening 111 is arranged on the end wall 113, and the single battery 100 further comprises an insulation member 180 arranged between the disc body part 131 and the end wall 113. Figure 4

[0067] The shell 110 has an end wall 113, and the opening 111 is arranged on the end wall 113. By arranging the insulation member 180 between the disc body part 131 and the end wall 113, the disc body part 131 can be prevented from contacting the shell 110 to cause short circuit and affect the safety of the single battery 100 under the insulation of the insulation member 180.

[0068] Optionally, the first insulation seal 160, the second insulation seal 170 and the insulation member 180 can all be rubber members.

[0069] In an embodiment, the single battery 100 further comprises a second current collector opposite in polarity to the first current collector 130, the second current collector is electrically connected to the battery cell 120, and the second current collector is located at an end of the battery cell 120 away from the first current collector 130, and the second current collector is electrically connected to the shell 110. In this way, the single battery 100 forms a current loop to enable charging and discharging. The second current collector and the first current collector 130 are respectively arranged at opposite ends of the battery cell 120 to prevent short circuit caused by contact of the two current collectors with different polarities.

[0070] For example, the first current collector 130 can be a positive current collecting disc, and the first pole post 141 and the second pole post 142 are both positive pole posts; and the second current collector can be a negative current collecting disc.

[0071] ​Optionally, both the first terminal 141 and the second terminal 142 are positive terminals. The terminal assembly 140 also includes a third terminal (not shown in the figure). The third terminal can have the opposite polarity to the first terminal 141, making the third terminal a negative terminal. The third terminal is electrically connected to the housing 110. The first terminal 141 and the third terminal can be respectively located on opposite sides of the axial direction (i.e., the Z-direction) of the housing 110. One end of the battery cell 120 along the axial direction is provided with a positive electrode tab, which is electrically connected to the first current collector 130. The other end of the battery cell 120 along the axial direction is provided with a negative electrode tab, which is electrically connected to the second current collector. The second current collector is electrically connected to the third terminal.

[0072] like Figure 5 As shown, in any of the above embodiments of this application, a plurality of fuse portions 133 are provided, and the plurality of fuse portions 133 are spaced apart along the inner circumferential direction of the disk body portion 131.

[0073] In this embodiment, by setting the number of fuses 133 to multiple and arranging the multiple fuses 133 at intervals along the inner circumference of the disk portion 131, it can ensure the function of the fuses 133 to quickly cut off the current when an external short circuit is triggered during the discharge process. On the other hand, it can also improve the overcurrent capacity of the fuses 133 during the charging process, thereby further reducing the temperature of the single cell 100 during the high-rate charging process and further avoiding the impact of excessive temperature on the performance of the single cell 100.

[0074] Optionally, multiple fuse sections 133 are evenly spaced along the circumference of the disk section 131. By evenly spaced multiple fuse sections 133 along the inner circumference of the disk section 131, the uniformity of discharge current and charging current flowing through the fuse section 133 can be improved, which helps to ensure the stability of the function of the fuse section 133 to quickly cut off the current and reduce the temperature of the single cell 100 during high-rate charging.

[0075] Embodiments of this application also provide a battery pack, including the single battery cell 100 in any of the above embodiments.

[0076] The battery pack has the single cell 100 of any of the above embodiments, and therefore has all the beneficial effects of the single cell 100, which will not be described in detail here.

[0077] The battery pack has a housing and at least one individual battery cell 100 as described in any of the above embodiments, with the individual battery cell 100 disposed within the housing. When there are multiple individual batteries cell 100, the multiple individual batteries cell 100 can be connected in series or in parallel, or in a combination of series and parallel connections, which will not be elaborated further.

[0078] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0079] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A single cell, characterized by, The single battery (100) comprises: an electric core (120); a first current collector (130), which comprises a disc body (131), a center part (132) and a fuse part (133), the center part (132) is arranged at the inner periphery of the disc body (131) and has a gap with the disc body (131), the fuse part (133) is arranged in the gap and connected with the disc body (131) and the center part (132) respectively, one end of the electric core (120) is electrically connected with the disc body (131); a pole assembly (140), which comprises a first pole (141) and a second pole (142), the first pole (141) is electrically connected with the center part (132), the second pole (142) is electrically connected with the disc body (131), and the second pole (142) is insulated from the first pole (141); a wire assembly (150), which comprises a first wire (151) and a second wire (152), the first wire (151) is electrically connected with the first pole (141), two ends of the second wire (152) are respectively electrically connected with the second pole (142) and the first wire (151), and a one-way conducting member (1521) is arranged on the second wire (152), the one-way conducting member (1521) is used for one-way conducting of the current flowing from the second wire (152) to the second pole (142).

2. The cell according to claim 1, wherein The center part (132) is provided with an insulating layer (134) on one side facing the electric core (120); and / or, the fuse part (133) is provided with an insulating layer (134) on one side facing the electric core (120).

3. The cell according to claim 1, wherein The second pole (142) is provided with a through hole (1421), the first pole (141) is arranged in the through hole (1421) and insulated from the second pole (142).

4. The cell according to claim 3, wherein The single battery (100) further comprises a shell (110) and a first insulating sealing member (160), the shell (110) has a containing cavity (112) with an opening (111), the electric core (120) is arranged in the containing cavity (112), the second pole (142) is arranged in the shell (110) and closes the opening (111), and the first insulating sealing member (160) is arranged between the outer peripheral wall of the first pole (141) and the inner wall of the through hole (1421).

5. The cell according to claim 4, wherein The inner wall of the through hole (1421) is provided with a first limiting part (14211), and the first insulating sealing member (160) is provided with a second limiting part (161) on the outer peripheral wall of one end facing the electric core (120), the second limiting part (161) cooperates with the first limiting part (14211) to limit the movement of the first insulating sealing member (160) in the axial direction of the first pole (141). A third limiting portion (162) is arranged on an inner circumferential wall of the first insulating sealing member (160), and a fourth limiting portion (1411) matched with the third limiting portion (162) is arranged on an outer circumferential wall of the first pole column (141) to limit movement of the first pole column (141) in an axial direction thereof.

6. The cell according to claim 5, wherein The first limiting portion (14211) has a first clamping groove arranged on an inner wall of the through hole (1421), and at least part of a slot of the first clamping groove faces the battery cell (120), and at least part of the second limiting portion (161) is clamped into the first clamping groove. The fourth limiting portion (1411) has a second clamping groove arranged on a circumferential direction of the first pole column (141), and at least part of the third limiting portion (162) is clamped into the second clamping groove.

7. The cell according to claim 4, wherein The single battery (100) further comprises a second insulating sealing member (170) arranged between the second pole column (142) and an inner wall of the opening (111) and abutting with the second pole column (142) and the inner wall of the opening (111) respectively. And / or, the shell (110) has an end wall (113), and the opening (111) is arranged on the end wall (113), and the single battery (100) further comprises an insulating member (180) arranged between the disc body portion (131) and the end wall (113).

8. The cell according to claim 4, wherein The single battery further comprises a second current collector opposite in polarity to the first current collector (130), the second current collector is electrically connected with the battery cell (120), and the second current collector is located at an end of the battery cell (120) away from the first current collector (130), and the second current collector is electrically connected with the shell (110).

9. The monobloc cell according to any one of claims 1 to 8, characterized in that, The fuse portion (133) is arranged in plurality, and the plurality of fuse portions (133) are arranged at intervals along an inner circumference of the disc body portion (131).

10. A battery pack, characterized by, The single battery (100) of any one of claims 1 to 9 is included.

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