Plug and lithium ion battery

Abstract

The utility model relates to the field of application connection of lithium ion batteries, in particular to a plug and a lithium ion battery. The plug comprises an insulating base, a first cavity with an opening in the front end, a second cavity, discharging connectors and a charging connector, the discharging connectors are fixed to the insulating base, the front ends of the discharging connectors are located in the first cavity, a gap is formed between the discharging connectors and the cavity wall of the first cavity, the rear ends of the discharging connectors are exposed out of the rear end of the insulating base, and the charging connector is fixed to the front end of the insulating base. And the charging connectors are fixed on the insulating base, the front ends of the charging connectors are respectively positioned in the second cavity and are spaced from the cavity wall of the second cavity, and the rear ends of the charging connectors are respectively exposed out of the rear end of the insulating base. By applying the technical scheme, the universality and compatibility of the plug can be improved, and user application is facilitated.

Description

Technical Field

[0001] The utility model relates to the application connection field of lithium - ion batteries, in particular to a plug and a lithium - ion battery. Background Art

[0002] With the increasingly wide application of lithium - ion battery devices, more and more devices use lithium - ion batteries. People's requirements for the connection device between the lithium - ion battery and the device, and for the connection device between the battery and the charger are gradually increasing, and the requirements are becoming more and more flexible.

[0003] Currently, the battery packs on the market are respectively provided with a discharge plug and a charging line plug. When charging, the charging power supply is plugged into the charging plug. When discharging, the power plug of the electrical device is plugged into the discharge plug. The inventor of the present utility model found during the research process of the present utility model that the prior art has defects such as inconvenient plugging and unplugging of the plug and excessive space occupation. Summary of the Invention

[0004] One of the purposes of the embodiments of the present utility model is to provide a plug and a lithium - ion battery. Applying this technical solution is beneficial to improving the universality and compatibility of the plug and facilitating user application.

[0005] In a first aspect, a plug provided by an embodiment of the present utility model includes:

[0006] An insulating base, at the front end of the insulating base, there are a first chamber and a second chamber with front - end openings.

[0007] Discharge connectors, fixed on the insulating base, the front ends of the discharge connectors are respectively located in the first chamber, and have a spacing from the chamber wall of the first chamber, and the rear ends are respectively exposed at the rear end of the insulating base.

[0008] Charging connectors, fixed on the insulating base, the front ends of the charging connectors are respectively located in the second chamber, and have a spacing from the chamber wall of the second chamber, and the rear ends are respectively exposed at the rear end of the insulating base.

[0009] Optionally, the segments of the discharge connectors located in the first chamber are metal tubes.

[0010] Optionally, axial gaps are respectively formed in the tube walls of the metal tubes, the gaps are open at the front ends of the metal tubes, and the tube walls of the metal tubes are spaced by the gaps into metal sheets surrounding a ring.

[0011] Optionally, it further includes at least one sampling connector, fixed on the insulating base, the front end is located in the second chamber, and has a spacing from the chamber wall of the second chamber, and the rear end extends out from the rear end of the insulating base to connect the charge - discharge protection module of the battery pack.

[0012] Optionally, the back ends of the charging connectors and sampling connectors are respectively fixedly connected to the exposed wire cores at the front ends of the respective conductive wires, and the respective conductive wires extend out from the rear end of the insulating base.

[0013] Optionally, the back ends of the respective conductive wires are commonly electrically connected to a connector and are plugged into the connector on the charge and discharge protection module.

[0014] Optionally, a lateral snap portion is respectively provided on each of the charging connectors, sampling connectors, and / or discharge connectors.

[0015] An inverted hanging position is further respectively provided on the hole walls of the respective jacks of the insulating base. When the charging connectors and the sampling connectors are fixed in the respective jacks of the insulating base, the respective lateral snap portions are respectively limited in the inverted hanging positions of the respective jacks where they are located.

[0016] Optionally, a guiding position is further respectively provided on the hole walls of the respective jacks. The guiding position is located at the rear end of the inverted hanging position and at the front end of the rear end socket. The side where the guiding position is located is opposite to the side where the inverted hanging position is located.

[0017] At the guiding position, in the direction from back to front, the distance from the hole wall at the guiding position to the hole wall at the opposite end gradually decreases.

[0018] When the respective lateral snap portions on the charging connectors, sampling connectors, and / or discharge connectors do not reach the inverted hanging positions, the respective guiding positions are in close contact with the charging connectors, sampling connectors, and / or discharge connectors. Under the action of the respective guiding positions, the charging connectors, sampling connectors, and / or discharge connectors elastically deform, causing the lateral guiding positions to move towards the respective inverted hanging positions until the respective lateral snap portions are limited in the respective inverted hanging positions, and then the charging connectors elastically recover to the natural state.

[0019] In a second aspect, a lithium-ion battery provided by an embodiment of the present invention includes:

[0020] A lithium-ion battery pack body, including a plurality of lithium-ion battery cells electrically connected in series or in parallel or in a combination of both;

[0021] A charge and discharge protection module, including

[0022] A discharge circuit, electrically connected to the positive electrode and the negative electrode of the lithium-ion battery pack body,

[0023] A charging circuit, electrically connected to the positive electrode and the negative electrode of each of the lithium-ion battery cells,

[0024] A control circuit, electrically connected to the discharge circuit and the charging circuit respectively;

[0025] For any one of the above plugs, the rear end of the charging connector of the plug is electrically connected to the charging circuit, and the rear end of the discharging connector of the plug is electrically connected to the discharging circuit.

[0026] Optionally, the charge and discharge protection module further includes a sampling circuit, which is electrically connected to any electrical node inside the lithium ion battery pack, and the sampling circuit is also electrically connected to the control circuit and the sampling connector of the plug.

[0027] As can be seen from the above, on the plug of this embodiment, independent charging sockets and discharging sockets are integrated, and the charging socket and the discharging socket are independent of each other. They can be respectively plugged into the existing separate charging plug and the existing separate discharging plug alone, or can be plugged into the plug integrated with the charging plug and the discharging plug that matches the plug of this embodiment. At this time, for the further application principle, please refer to the corresponding description of the lithium ion battery with the plug of this embodiment later. Description of the Drawings

[0028] The drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and do not constitute an improper limitation to the present invention.

[0029] Figure 1 Schematic perspective view of the plug provided in Embodiment 1 of the present invention;

[0030] Figure 2 Schematic top view of the plug provided in Embodiment 1 of the present invention;

[0031] Figure 3 Schematic bottom view of the plug provided in Embodiment 1 of the present invention;

[0032] Figure 4 Schematic front view of the plug provided in Embodiment 1 of the present invention;

[0033] Figure 5 Schematic left view of the plug provided in Embodiment 1 of the present invention;

[0034] Figure 6 Schematic right view of the plug provided in Embodiment 1 of the present invention;

[0035] Figure 7 Schematic exploded view of the plug provided in Embodiment 1 of the present invention;

[0036] Figure 8 Schematic cross-sectional view of the plug provided in Embodiment 1 of the present invention;

[0037] Figure 9Schematic diagram of the assembly structure of the plug and the female connector provided in Embodiment 1 of the present utility model;

[0038] Figure 10 Stereoscopic diagram when the plug and the female connector provided in Embodiment 1 of the present utility model are plugged together;

[0039] Figure 11 Stereoscopic structure diagram of the plug provided in Embodiment 1 of the present utility model;

[0040] Figure 12 Exploded stereoscopic structure diagram of the plug provided in Embodiment 1 of the present utility model;

[0041] Figure 13 Front view structure diagram of the plug provided in Embodiment 1 of the present utility model;

[0042] Figure 14 Left view structure diagram of the plug provided in Embodiment 1 of the present utility model;

[0043] Figure 15 Right view structure diagram of the plug provided in Embodiment 1 of the present utility model;

[0044] Figure 16 A-A sectional view structure diagram of the plug provided in Embodiment 1 of the present utility model;

[0045] Figure 17 Top view structure diagram of the plug provided in Embodiment 1 of the present utility model;

[0046] Figure 18 Bottom view structure diagram of the plug provided in Embodiment 1 of the present utility model;

[0047] Figure 19 Schematic diagram of the assembly structure of the plug and the female connector provided in Embodiment 1 of the present utility model;

[0048] Figure 20 Stereoscopic diagram when the plug and the female connector provided in Embodiment 1 of the present utility model are plugged together;

[0049] Figure 21 Schematic diagram of the circuit principle of the battery pack with a charging and discharging plug provided in Embodiment 1 of the present utility model;

[0050] Figure 22 Transfer assembly diagram of two charging and discharging plugs provided in Embodiments 1 and 2 of the present utility model;

[0051] Figure 23 Sectional view structure diagram when two charging and discharging plugs provided in Embodiments 1 and 2 of the present utility model are connected.

[0052] 1: Insulating base; 11: First chamber; 12: Second chamber; 13: Jack; 4: Inverted hanging position;

[0053] 2: Discharge connector; 21: Metal sheet; 22: Gap; 3: Charging connector; 4: Sampling connector;

[0054] 5: Conductive wire; 6: Lateral snap part; 7: Insertion position; 8: Limiting part; 9: Male connector;

[0055] 10: Female connector;

[0056] 21: First insulating base; 211: First insulating socket; 212: Second insulating socket;

[0057] 213: First jack; 214: Second lateral snap part; 23: Charging female connector;

[0058] 24: Sampling female connector; 22: Discharge female connector; 221: Welding part;

[0059] 222: First lateral snap part; 25: Clamping part; 26: Metal jack; 27: Gap;

[0060] 28: Metal part; 281: End segment; 282: Bending part; 291: First lateral window part;

[0061] 292: Second lateral window part; 5: Conductive wire; 31: Female plug of the power supply of the electrical equipment. Detailed implementation mode

[0062] The present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Here, the illustrative embodiments of the present utility model and the description are used to explain the present utility model, but do not limit the present utility model. Embodiment

[0063] See Figure 1-10 and shown in 21.

[0064] This embodiment provides a plug, which mainly includes an insulating base 1, a discharge connector 2, and a charging connector 3.

[0065] The insulating base 1 is the hand-held part of the plug. The discharge connector 2 and the charging connector 3 are both arranged on the insulating base 1. Specifically, taking the end of the insulating base 1 that is plugged into other plugs as the front end, and the end opposite to the front end as the rear end. A first chamber 11 and a second chamber 12 are provided at the front end of the insulating base 1. The two chambers are independent of each other, and the openings are both located at the front end.

[0066] In this embodiment, the first chamber 11 is used as the chamber of the discharge connector 2. The discharge connector 2 includes an independent positive discharge connector 2 and a negative discharge connector 2. The middle parts of the positive discharge connector 2 and the negative discharge connector 2 are respectively fixed in the insulating base 1, and the front ends are respectively located in the first chamber 11, and the positive discharge connector 2 and the negative discharge connector 2 have gaps 22 with the inner wall of the first chamber 11, so that an external power plug can enter the first chamber 11 and connect with the discharge connector 2 in the first chamber 11 to achieve current output. The rear ends of the positive discharge connector 2 and the negative discharge connector 2 are exposed at the rear end of the insulating base 1. In addition, a welding portion can be provided at the rear ends of the positive discharge connector 2 and the negative discharge connector 2, but is not limited to, to weld the power line of the external electrical equipment.

[0067] As an illustration of this embodiment, the discharge connector 2 of this embodiment can be made of copper, such as but not limited to copper tubes.

[0068] As an illustration of this embodiment, at least two gaps 22 extending in the axial direction may be opened on the wall of the copper tube, the gap 22 is open at the front end of the discharge connector 2, and the longer section of the wall at the front end of the copper tube is separated into a plurality of metal sheets 21 in a ring shape by the gap 22.

[0069] like Figure 9 , 10 As shown, when plugged into an external female connector 11, the discharge connector 2 of this embodiment can be inserted into the female connector 11 at the opposite end as a male component. At this time, the metal sheets 21 of the discharge connector 2 of this embodiment are radially close to each other, and each metal sheet 21 is tightly attached to the inner wall of the plugged female connector 11 and is not easy to loosen.

[0070] like Figure 11 , 12 As shown, when the male connector 9 of the opposite plug is inserted into the tube of the discharge connector 2 of this embodiment, the metal sheets 21 on the inner wall of the tube cavity of the discharge connector 2 of this embodiment are subjected to the radial external force of the male connector 9, and have a radial contraction tendency, and are attached to the outer wall of the male connector 9 to be plugged in and are not easy to loosen. The discharge connector 2 with this structure can be matched with both the male connector 9 and the female connector 11, and has high application flexibility.

[0071] In this embodiment, the second chamber 12 is used as the chamber of the charging connector 3. The charging connector 3 at least includes an independent positive charging connector 3 and a negative charging connector 3. The middle parts of the positive charging connector 3 and the negative charging connector 3 are respectively fixed in the insulating base 1, and the front ends are separately located in the second chamber 12. Moreover, there are gaps 22 between the positive charging connector 3, the negative charging connector 3 and the inner wall of the second chamber 12, so that an external charging plug can be inserted into the second chamber 12 from the front end to be plugged with the charging connector 3 in the second chamber 12. The rear ends of the positive charging connector 3 and the negative charging connector 3 are exposed at the rear end of the insulating base 1, or the rear ends extend out of the rear end of the insulating base 1 through the connected conducting wires 5 for external connection.

[0072] As a schematic illustration of this embodiment, a sampling connector 4 is further arranged in the second chamber 12 of the plug. Similar to the positive charging connector 3 and the negative charging connector 3, the front end of the sampling connector 4 is located in the second chamber 12 and has a distance from the inner wall of the second chamber 12. The rear end of the sampling connector 4 is exposed at the rear end of the insulating base 1 or extends out of the rear end of the insulating base 1 through the connected conducting wire 5 for external connection. During application, the sampling connector 4 is electrically connected to a certain predetermined electrical node in the battery pack body and the control circuit in the charge and discharge control module of the battery pack through the conducting wire 5 to sample the voltage of this electrical node, input the sampling result into the control circuit, and at the same time transfer the sampling result to the control module of the charging power supply at the opposite end (if the plug at the charging power supply end is also equipped with a sampling connector 4), so that the external charging power supply can control the output charging voltage and charging current according to the sampled voltage value of the battery pack on the side to be charged, further improving the charging balance and safety, avoiding overcharging, and increasing the service life of the battery pack.

[0073] As an illustration of this embodiment, the positive charging connector 3, the negative charging connector 3, and the sampling connector 4 of this embodiment are respectively metal connectors. The metal connector can be, but is not limited to, a solid metal part. As a male part, it can also be, but is not limited to, a female part with an annular jack 13 fixed at the front end of the solid metal part. The middle parts of the metal connectors are fixed in the insulating base 1, and the front ends extend into the second chamber 12 respectively and have a spacing from the inner wall of the second chamber 12 for the plug of an external charger to extend into the second chamber 12 and be plugged into the charging connector 3. The front end of the metal connector can be a male part (plugged into the female part at the opposite end) or a female part (plugged into the male part at the opposite end). As an illustration of this embodiment, the exposed wire core 5 of the front end of the conducting wire 5 can be clamped at the rear end of each metal connector. The wire core of the conducting wire 5 behind the exposed wire core 5 is sleeved with an insulating sleeve. A plurality of conducting wires 5 form a conducting wire 5 harness, and the conducting wire 5 harness extends out from the rear end of the insulating base 1. As an illustration of this embodiment, the wire cores of the rear ends of the conducting wire 5 harness can be commonly connected to a multi-pin plug. When plugging into the charge and discharge control module of the battery pack, the plugging of a multi-pin plug realizes the electrical connection of multiple conducting wires 5, improving work efficiency and avoiding incorrect connection. As an illustration of this embodiment, an anti-reverse plugging part is also provided on the multi-pin plug. When the anti-reverse plugging parts of the plugging pin plugs match, the plugging can be successful, avoiding reverse connection.

[0074] As an illustration of this embodiment, the discharge connector 2, the charging connector 3, and the sampling connector 4 can be, but are not limited to, pre-placed in an injection mold when the insulating base 1 is injection molded, and each connector is integrally molded on the insulating base 1 during injection.

[0075] As an illustration of this embodiment, the discharge connector 2, the charging connector 3, and the sampling connector 4 can be assembled on the already molded insulating base 1 through an assembly process. Specifically, on the insulating base 1, a jack 13 for inserting the charging connector 3 communicating with the first chamber 11 and jacks 13 for inserting the discharge connector 2 and the sampling connector 4 communicating with the second chamber 12 are preset. There is an insertion opening at the rear end of the insulating base 1 for the connector to be inserted into the jack 13.

[0076] As an illustration of this embodiment, an inverted positioning portion 14 is further provided on the inner wall of the insertion hole 13 of each charging connector 3 and / or sampling connector 4. During installation, the charging connector 3 and the sampling connector 4, which clamp the conductive wire 5 at the rear end, are respectively inserted into the respective insertion holes 13 from the insertion openings at the rear end of the insulating base 1. When the lateral locking portions 6 on the charging connector 3 and the sampling connector 4 are respectively locked to the inverted positioning portion 14 on the inner wall of the hole, the charging connector 3 and the sampling connector 4 are positioned at this position, and the front ends of the charging connector 3 and the sampling connector 4 extend out of the front end of the insertion hole 13 and are located in the second chamber 12. The adoption of the lateral locking portion 6 and the inverted positioning portion 14 is beneficial to accurate positioning during assembly, improving the assembly efficiency and assembly effect. Moreover, with this design, during the plugging and unplugging with an external charging plug, it is not easy to displace due to the plugging and unplugging force, which is beneficial to improving the durability of the product.

[0077] As an illustration of this embodiment, a guiding portion 7 is further provided on the inner wall of each insertion hole 13 for inserting the charging connector 3 and / or the sampling connector 4. The guiding portion 7 is located at the rear end of the inverted positioning portion 14 and at the front end of the insertion opening. The guiding portion 7 and the inverted positioning portion 14 are respectively located on opposite inner wall sides of the hole. Taking the inverted positioning portion 14 as a lateral recess and the inverted positioning portion 14 being located on the lower inner wall of the insertion hole 13 as an example, the guiding portion 7 is located on the upper inner wall of the insertion hole 13. In the direction from the rear to the front, the distance between the inner wall at the guiding portion 7 and the opposite inner wall gradually becomes narrower. When the metal connector is inserted into the insertion hole 13, the lateral locking portion 6 of the metal connector faces downward. The metal connector passes through the guiding portion 7 in the rear insertion hole 13, and the guiding portion 7 is in close contact with the lateral guiding portion 7, acting on the upper end of the metal connector. As the distance between the guiding portion 7 and the opposite inner wall decreases, the guiding portion 7 causes the metal connector to elastically deform and shift towards the inverted positioning portion 14 until the lateral locking portion 6 at the relatively front section of the metal connector enters the inverted positioning portion 14, and the metal connector elastically returns to its natural state and is positioned here. As can be seen from the above, the adoption of the guiding portion 7 is beneficial to the accurate positioning of the assembly of the metal connector, improving the work efficiency. As an illustration of this embodiment, a flat metal connector can be used but is not limited to this. A lateral locking portion 6 is provided on the lower surface at the relatively front section of the flat metal connector.

[0078] As an illustration of this embodiment, a laterally protruding limiting portion 8 can also be provided in the middle of the discharging connector 2. During installation, the discharging connector 2 is inserted from the rear to the front until the protruding limiting portion 8 enters the laterally recessed limiting portion 8 in the insertion hole 13, and then the discharging connector 2 stops and is positioned here.

[0079] The middle portions of the first metal connectors are limited within the insulating base 1, the rear ends clamp the conductive wire cores connected thereto, and the front ends are conductor male plugs or conductor female plugs extending out into the second chamber.

[0080] As an illustration of this embodiment, a transfer circuit electrically connected between the charging circuit and the discharge plug is further provided on the charge and discharge control module of the battery pack. When an external charging power source is connected to charge the battery pack, the control circuit cuts off the electrical connection between the discharge circuit and the discharge plug, connects the transfer circuit, transfers the current input from the external charging power source to the discharge plug, and outputs it to an external electrical device through the discharge connector to drive the electrical device to work.

[0081] As can be seen from the above, in the plug of this embodiment, independent charging sockets and discharge sockets are integrated. The charging socket and the discharge socket are independent of each other and are respectively plugged in separately with the existing separate charging plug and the existing separate discharge plug, or can be plugged in with a plug integrated with a charging plug and a discharge plug that matches the plug of this embodiment. At this time, the further application principle is described in detail in the corresponding description of the lithium-ion battery with the plug of this embodiment later.

[0082] The plug of this embodiment can be applied to a lithium-ion battery. The lithium-ion battery includes a lithium-ion battery pack body, a charge and discharge protection module, and the plug described above in this embodiment.

[0083] The lithium-ion battery pack body includes a plurality of lithium-ion battery cells, and each cell is electrically connected in series, in parallel, or a combination of both.

[0084] The charge and discharge protection module includes a discharge circuit, a charging circuit, and a control circuit electrically connected to the discharge circuit and the charging circuit respectively. The control circuit controls the operation of the charging circuit and the discharge circuit.

[0085] Among them, the input end of the discharge circuit is electrically connected to the positive and negative electrodes of the lithium-ion battery pack body, and the output end is electrically connected to the rear ends of the positive discharge connector 2 and the negative discharge connector 2 of the plug of this embodiment respectively. When the plug of this embodiment is plugged in with the power plug of an external electrical device, the battery pack body is in a discharge state, and the discharge circuit outputs current externally under the control of the control circuit. Applying this solution, during the discharge process, the charging connector 3 on the plug is electrically connected to each cell and the control circuit respectively. Therefore, during the discharge process, the charging connector 3 on the plug becomes the voltage sampling circuit of each cell, and the control circuit further controls the discharge of the battery pack online according to the current voltage of each cell to balance the discharge and avoid over-discharge.

[0086] The output terminal of the charging circuit is electrically connected to the positive and negative electrodes of each lithium-ion cell in the battery pack body, and the input terminal is electrically connected to the rear end of the charging connector 3 of the plug of this embodiment. When the plug of this embodiment is plugged into an external charging power source, the charging circuit charges each lithium-ion cell under the control of the control circuit. Applying this solution, during the charging process of the battery pack, the discharge connector 2 of the plug becomes the voltage sampling circuit of the battery pack body, and the control circuit further controls the charging of each cell online according to the voltage of the battery pack body to achieve balanced charging and avoid overcharging.

[0087] As can be seen from the above, applying the plug of this embodiment in the battery pack, the plug integrates the charging plug and the discharge plug, which is beneficial to facilitate the external connection of users and save the plug-in occupied space. And compared with the prior art, during the charging process, the line of the discharge interface becomes the voltage sampling circuit of the charging process, and during the discharging process, the line of the charging interface becomes the voltage sampling circuit of the discharging process. The control circuit performs balanced charge and discharge control according to each voltage sampling signal, providing further balanced protection for the safety and reliability of the charging and discharging of the battery pack. Embodiment

[0088] See Figure 11-21 as shown.

[0089] This embodiment provides a plug, which mainly includes a first insulating base 21, two independent discharge female connectors 22, and two independent charging female connectors 23.

[0090] The first insulating base 21 is the handheld part of the plug and the mounting base of each connector. The discharge female connectors 22 and the charging female connectors 23 are both arranged on the first insulating base 21. Specifically, taking the end of the first insulating base 21 that is plugged into other plugs as the front end, and the end opposite to the front end as the rear end.

[0091] At the front end of the first insulating base 21, there are forwardly protruding first insulating sockets 211 and second insulating sockets 212. The two insulating sockets are in an independent separated state, specifically, there is a certain distance between them.

[0092] In the first insulating socket 211, there are two first jacks 213 that extend through from front to back. The front sockets of each first jack 213 are respectively located on the front surface of the first insulating socket 211, and the rear sockets are located at the rear end of the first insulating base 21. One of the first jacks 213 on the first insulating socket 211 is fixed with a discharge female connector 22, and the other first jack 213 is fixed with another discharge female connector 22.

[0093] The front ends of the discharge female connectors 22 are respectively located within the corresponding first jacks 213 and do not extend beyond the front sockets, so as to improve the moisture-proof and dust-proof effects. The front ends of the discharge female connectors 22 are respectively provided with sockets for inserting the male connectors. The rear ends of the discharge female connectors 22 respectively extend out of the rear end of the first insulating base 21 from the rear sockets. Additionally, welding parts 221 can be respectively provided at the rear ends of the two discharge female connectors 22 (but not limited to this) to weld the power supply lines of external electrical devices, so as to output current and supply power to the external electrical devices.

[0094] As an illustration of this embodiment, the discharge female connectors 22 of this embodiment can be made of copper parts. For example (but not limited to this), the front section of the copper part is set as a copper tube with the tube orifice facing forward, and the rear end of the copper tube is preferably designed as a closed end to improve the moisture-proof and dust-proof performance of the plug. The rear end of the closed end extends out of the rear end of the first insulating base 21, and a welding part 221 is provided at the rear end.

[0095] As an illustration of this embodiment, the discharge female connectors 22 can be pre-placed in the injection mold when the first insulating base 21 is injection molded, so that each connector is integrally formed on the first insulating base 21 during injection molding (but not limited to this).

[0096] As an illustration of this embodiment, on the outer periphery of the middle parts of the discharge female connectors 22 of this embodiment, first lateral snap parts 222 are respectively provided. On the hole walls of the first jacks 213 of the first insulating socket 211, second lateral snap parts 214 are respectively provided which are adapted in position, shape and size to the first lateral snap parts 222. After assembly, the first lateral snap parts 222 of the discharge female connectors 22 are respectively snapped with the second lateral snap parts 214 of the corresponding first jacks 213, and the discharge female connectors 22 are positioned within the first jacks 213 of the first insulating socket 211. When plugged into the female plug 31 of the power supply of an external electrical device, under the action of the plugging and unplugging force, each discharge connector is stable and does not move back and forth.

[0097] In the second insulating socket 212, at least two first jacks 213 extending forward and backward and penetrating through are provided. The front sockets of the two first jacks 213 are located on the front end face of the second insulating socket 212, and the rear sockets are located at the rear end of the first insulating base 21. A discharge female connector 22 is fixed in one of the first jacks 213 of the second insulating socket 212, and another discharge female connector 22 is fixed in the other first jack 213.

[0098] The front end of each charging female connector 23 is located in the first socket 213 and does not exceed the front end socket. The rear end of each charging female connector 23 extends out of the rear end of the first insulating base 21, or extends from the rear end of the first insulating base 21 through the connected conductive wire 5. The front end of each charging female connector 23 is provided with a socket for insertion of a male connector of an external charging power source to electrically connect and realize current input to charge the battery pack.

[0099] As can be seen from the above, the plug of this embodiment integrates a discharge plug provided on the first insulating socket 211 and a charge-discharge plug provided on the second insulating socket 212, and there is a gap between the first insulating socket 211 and the second insulating socket 212. When used, they can be plugged in separately with a separate discharge plug of the prior art and a separate charge plug of the prior art. It can also be plugged in with a plug that integrates a charge plug and a discharge plug that matches the plug of this embodiment to achieve conversion to adapt to the interface of an external plug. For further application principles, please refer to the corresponding description of the lithium-ion battery with the plug of this embodiment below.

[0100] As an illustration of this embodiment, in addition to the first socket 213 for fixing the charging female connector 23, the second insulating socket 212 is further provided with first sockets 213 for fixing each sampling female connector 24, and the front end socket of the sampling female connector 24 is completely located in the front end socket of the first socket 213 where it is located.

[0101] The structure of each sampling connector female component 24 can be but is not limited to being the same as that of each charging connector female component 23. Specifically, a socket is provided at the front end of the sampling connector female component 24, and the rear end of the sampling connector female component 24 extends out of the rear end of the first insulating base 21, or the wire connected to its rear end extends out of the rear end of the first insulating base 21 for external connection.

[0102] When in use, the sampling connector mother component 24 is electrically connected to a predetermined electrical node in the battery pack body and the control circuit in the charge and discharge control module of the battery pack through the conductive wire 5, the voltage of the electrical node is sampled, and the sampling result is input into the control circuit. At the same time, the sampling result is transmitted to the control module of the charging power supply at the opposite end (if the plug at the charging power supply end is also equipped with the sampling connector mother component 24), so that the external charging power supply can control the output charging voltage and charging current according to the sampled voltage value of the battery pack on the charged side, so as to further improve the charging balance and safety, avoid overcharging, and increase the life of the battery pack.

[0103] As an illustration of this embodiment, each charging female connector 23 and sampling female connector 24 of this embodiment are mainly made of metal sheet metal parts. A clamping portion 25 is respectively formed at the rear end of the metal sheet metal part, and each clamping portion 25 can be formed by bending a sheet metal at the end of the metal sheet metal part, but is not limited thereto. An exposed wire core at the front end of a conductive wire 5 is tightly clamped within each clamping portion 25, and each conductive wire 5 extends from the rear end of the first insulating base 21 to be electrically connected to the charge and discharge protection module of the battery pack. As an illustration of this embodiment, the wire cores of the conductive wires 5 at the rear end of the wire harness can be commonly connected to a multi-pin plug. When plugging and unplugging with the charge and discharge control module of the battery pack, the plugging and unplugging of a multi-pin plug realizes the electrical connection of multiple conductive wires 5, improving work efficiency and avoiding wrong connection. As an illustration of this embodiment, an anti-reverse plugging portion is further provided on the multi-pin plug, and successful plugging can only be achieved when the anti-reverse plugging portions of the mating pin plugs match, avoiding reverse connection.

[0104] A metal jack 26 with an opening facing forward is respectively formed at the front end of each metal sheet metal part for the insertion of the mating male connector at the opposite end to achieve electrical connection. As an illustration of this embodiment, each metal jack 26 can be formed by bending a metal part 28 (such as but not limited to a metal sheet) located at the front end of the metal sheet metal part, but is not limited thereto. The two ends of the bent metal part 28 do not closely adhere and fix to each other, but are oppositely provided with a certain gap 27. The gap 27 is parallel to the axial direction of the metal jack 26, and the width of the gap 27 is the same everywhere. In this way, when an external male connector is inserted into the metal jack 26, the metal part 28 forming the metal jack 26 undergoes a slight elastic deformation, and the lateral gap 27 of the metal jack 26 elastically increases. Under the limitation of the inner wall of the first jack 213 where the metal jack 26 is located, the inner wall of the metal jack 26 closely adheres between the outer wall of the inserted male connector and the inner wall of the first jack 213 of the second insulating socket 212, and it is not easy to disconnect during plugging and unplugging under the action of the elastic deformation force of the metal jack 26.

[0105] As an illustration of this embodiment, a bent metal piece 28 is further provided in each metal socket 26, such as but not limited to a metal strip or a metal sheet with elastic deformation ability. The front end of the metal piece 28 is fixed inside the metal socket 26 or extends out of the metal socket 26 and is fixed inside the first socket 213 on the first insulating base 21 or extends out of the first socket 213 and is fixed on the first insulating base 21. The middle section and the rear end of the metal piece 28 are both free ends and can elastically stretch under pressure. When an external male plug is inserted into the metal socket 26 inside the first socket 213 of the second insulating socket 212, the male plug is in close contact with the bent metal piece 28 inside the metal socket 26. Under the pressure of the male plug, the metal piece 28 elastically deforms. In addition to being in close contact with the inner wall of the metal socket 26, the inserted male plug is further in close contact with the bent metal piece 28 inside the metal socket 26, making it further difficult to become loose. This further improves the plugging reliability of the connection between the second insulating socket 212 and the plug of an external charging power source.

[0106] As an illustration of this embodiment, lateral window portions (denoted as first lateral window portions 291) can be further opened on the sides of each first socket 213 of the second insulating socket 212, and each first lateral window portion 291 is located on the side of the second insulating socket 212.

[0107] Correspondingly, second lateral window portions 292 are respectively opened on each metal socket 26. When each charging female plug 23 and each sampling female plug 24 are respectively inserted into each first socket 213 of the second insulating socket 212, each second lateral window portion 292 is respectively aligned with and located inside each first lateral window portion 291, forming lateral window portions that connect each metal socket 26 to the outside.

[0108] Further, a section at the front end of each metal piece 28 located within each metal jack 26 is bent laterally towards the side window portion, such that the bent end section 281 forms an acute angle a with the axial direction of the metal jack 26 in which it is located. The end section 281 extends out from the second side window portion 292 and the first side window portion 291, and is located in front of the rear end face of the first side window portion 291, abutting or almost abutting against it. Also, at least one bent portion 282 is formed in the middle section of the metal piece 28. These bent portions 282 are located within the metal jack 26 and may or may not be in contact with the inner wall of the first jack 213 opposite the first side window portion 291. When an external male plug is inserted into the metal jack 26, the male plug abuts against at least one bent portion 282 in the middle section of the metal piece 28. The front end of the metal piece 28 tightly abuts against the rear end face of the first side window portion 291 for fixed positioning. The free end of the rear end of the metal piece 28 extends rearward, and the middle section of the metal piece 28 undergoes elastic deformation and deflects towards the second side window portion 292. The inserted male plug is tightly confined between the elastically deformed metal piece 28 and the metal jack 26, making it not easy to become disengaged, and having close contact, ensuring the reliability of the electrical connection and reducing the contact resistance.

[0109] As an illustration of this embodiment, a transfer circuit is also provided on the charge and discharge control module of the battery pack, which electrically connects the charging circuit and the discharge plug. When an external charging power source is connected to charge the battery pack, the control circuit cuts off the electrical connection between the discharge circuit and the discharge plug, and connects the transfer circuit to transfer the current input from the external charging power source to the discharge plug, and outputs it to an external electrical device through the discharge connector to drive the electrical device to operate.

[0110] The plug of this embodiment can be applied to lithium-ion batteries. A lithium-ion battery includes a lithium-ion battery pack body, a charge and discharge protection module, and the plug as described above in this embodiment.

[0111] The lithium-ion battery pack body includes a plurality of lithium-ion battery cells, and each cell is electrically connected in series or in parallel or a combination of both.

[0112] The charge and discharge protection module includes a discharge circuit, a charging circuit, and a control circuit electrically connected to the discharge circuit and the charging circuit respectively. The control circuit controls the operation of the charging circuit and the discharge circuit.

[0113] Among them, the input end of the discharge circuit is electrically connected to the positive and negative electrodes of the lithium-ion battery pack body, and the output end is electrically connected to the rear end of the discharge female connector 22 of the plug of this embodiment respectively. When the plug of this embodiment is plugged into the power plug of an external electrical device, the battery pack body is in a discharge state, and the discharge circuit outputs current externally under the control of the control circuit. Applying this solution, during the discharge process, the charging female connector 23 of the plug is electrically connected to each battery cell and the control circuit respectively. Therefore, during the discharge process, the charging female connector 23 on the plug becomes the voltage sampling circuit of each battery cell, and the control circuit further controls the discharge of the battery pack online according to the current voltage of each battery cell to balance the discharge and avoid over-discharge.

[0114] The output end of the charging circuit is electrically connected to the positive and negative electrodes of each lithium-ion battery cell in the battery pack body, and the input end is electrically connected to the rear end of the charging female connector 23 of the plug of this embodiment. When the plug of this embodiment is plugged into an external charging power supply, the charging circuit charges each lithium-ion battery cell under the control of the control circuit. Applying this solution, during the charging process of the battery pack, the discharge female connector 22 of the plug becomes the voltage sampling circuit of the battery pack body, and the control circuit further controls the charging of each battery cell online according to the voltage of the battery pack body to balance the charging and avoid over-charging.

[0115] As can be seen from the above, applying the plug of this embodiment in the battery pack, the plug integrates a charging plug and a discharge plug, which is beneficial to facilitating the external connection of users and saving the occupied space of plugging. And compared with the prior art, during the charging process, the circuit of the discharge interface becomes the voltage sampling circuit during the charging process, and during the discharge process, the circuit of the charging interface becomes the voltage sampling circuit during the discharge process. The control circuit performs balanced charge and discharge control according to each voltage sampling signal, providing further balanced protection for the safety and reliability of the charging and discharging of the battery pack.

[0116] In summary, see Figure 22 、 23 As shown, adopting the technical solution of this embodiment, one of the plugs of Embodiment 1 and Embodiment 2 is configured on the lithium-ion battery, and the other of the plugs of Embodiment 1 and Embodiment 2 is configured as a matching adapter plug to increase the range of the power connectors of the electrical devices adapted to this lithium-ion battery through the adapter plug and improve the application flexibility of the battery pack.

[0117] The above-described embodiments do not constitute a limitation on the protection scope of the technical solution. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the above embodiments shall be included within the protection scope of the technical solution.

Claims

1. A plug, characterized in that: include: An insulating base, wherein a first cavity and a second cavity with front end openings are provided at the front end of the insulating base. The discharge connector is fixed on the insulating base, the front end of each of the discharge connectors is respectively located in the first chamber and has a distance from the cavity wall of the first chamber, and the rear end is respectively exposed at the rear end of the insulating base, The charging connector is fixed on the insulating base, the front end of each charging connector is respectively located in the second cavity and has a distance from the cavity wall of the second cavity, and the rear end is respectively exposed at the rear end of the insulating base.

2. The plug according to claim 1, characterized in that: The section of each discharge connector located in the first chamber is a metal tube.

3. The plug according to claim 2, characterized in that: An axial gap is respectively opened on the tube wall of each metal tube, each gap opens at the front end of the metal tube, and the tube wall of the metal tube is spaced by each gap to form a ring-shaped metal sheet.

4. The plug according to claim 1, characterized in that: It also includes at least one sampling connector, which is fixed on the insulating base, with its front end located in the second chamber and spaced apart from the cavity wall of the second chamber, and its rear end extending from the rear end of the insulating base to connect to the charge and discharge protection module of the battery pack.

5. The plug according to claim 4, characterized in that: The rear ends of the charging connectors and the sampling connectors are respectively fixedly connected to the exposed conductive wire cores at the front ends of the conductive wires, and the conductive wires extend from the rear ends of the insulating bases.

6. The plug according to claim 5, characterized in that: The rear ends of the conductive wires are electrically connected to a connector to be plugged with the connector on the charge and discharge protection module.

7. The plug according to claim 6, characterized in that: A lateral buckle portion is provided on each of the charging connector, the sampling connector and / or the discharging connector. An inverted hanging position is also provided on the hole wall of each socket of the insulating base. When each charging connector and each sampling connector are respectively fixed in each socket of the insulating base, each lateral buckle part is respectively limited to the inverted hanging position of the socket where it is located.

8. The plug according to claim 7, characterized in that: A guide position is also provided on the hole wall of each of the jacks. The guide position is located at the rear end of the inverted position and at the front end of the rear end socket. The side where the guide position is located is opposite to the side where the inverted position is located. At the introduction position, the distance from the hole wall at the introduction position to the hole wall at the opposite end gradually decreases from the back to the front. When the lateral buckle parts on each charging connector, sampling connector and / or discharging connector have not reached the inverted hanging position, each introduction position is in close contact with the charging connector, sampling connector and / or discharging connector, and under the action of each introduction position, each charging connector, sampling connector and / or discharging connector is elastically deformed, so that the lateral introduction position moves toward each inverted hanging position, until each lateral buckle part is limited to each inverted hanging position, and each charging connector elastically recovers to a natural state.

9. A lithium ion battery, characterized in that: include: The lithium-ion battery pack body comprises a plurality of lithium-ion cells electrically connected in series or in parallel or in combination of the two; Charge and discharge protection module, including: A discharge circuit is electrically connected to the positive electrode and the negative electrode of the lithium-ion battery pack body. A charging circuit is electrically connected to the positive electrode and the negative electrode of each of the lithium-ion batteries. A control circuit, electrically connected to the discharge circuit and the charging circuit respectively; The plug according to any one of claims 1 to 8, wherein a rear end of the charging connector of the plug is electrically connected to the charging circuit, and a rear end of the discharging connector of the plug is electrically connected to the discharging circuit.

10. The lithium-ion battery according to claim 9, characterized in that: The charge and discharge protection module further comprises a sampling circuit electrically connected to any electrical node in the lithium-ion battery pack body, and the sampling circuit is also electrically connected to the control circuit and the sampling connector of the plug.

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