Lithium ion battery pack

Abstract

The utility model relates to the field of application connection of lithium ion batteries, in particular to a lithium ion battery pack. Comprising a lithium ion battery pack body which comprises a plurality of lithium ion battery cells which are electrically connected in series or in parallel or in combination; the charging and discharging protection module is fixed at the end part of the lithium ion battery pack body and comprises a discharging circuit which is electrically connected with the positive electrode and the negative electrode of the lithium ion battery pack body, a charging circuit which is electrically connected with the positive electrode and the negative electrode of each lithium ion battery cell respectively, and a control circuit which is electrically connected with the discharging circuit and the charging circuit respectively; the charging and discharging plug comprises a discharging plug, the front end of a discharging connector in the discharging plug is an external plugging end, the rear end of the discharging connector is electrically connected with the discharging circuit, a gap is formed between the charging plug and the discharging plug, the front end of a charging connector on the charging plug is an external plugging end, and the rear end of the charging connector on the charging plug is electrically connected with the charging circuit.

Description

Technical Field

[0001] The utility model relates to the application connection field of lithium - ion batteries, in particular to a lithium - ion battery pack. 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 the defects of inconvenient plug connection 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 lithium - ion battery pack. Applying this technical solution is beneficial to improving the universality and compatibility of the plug and facilitating user application.

[0005] In the first aspect, a lithium - ion battery pack provided by the embodiments of the present utility model includes:

[0006] 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;

[0007] A charge - discharge protection module, fixed at the end of the lithium - ion battery pack body, including:

[0008] A discharge circuit, electrically connected to the positive electrode and the negative electrode of the lithium - ion battery pack body,

[0009] A charging circuit, electrically connected to the positive electrode and the negative electrode of each lithium - ion battery cell respectively,

[0010] A control circuit, electrically connected to the discharge circuit and the charging circuit respectively;

[0011] A charge - discharge plug, including:

[0012] A discharge plug, the front end of the discharge connector in the discharge plug is an external plug - in end, and the rear end is electrically connected to the discharge circuit,

[0013] A charging plug, having a gap with the discharge plug, the front end of the charging connector on the charging plug is an external plug - in end, and the rear end is electrically connected to the charging circuit.

[0014] Optionally, the charging plug is further provided with: a sampling connector, the front end of the sampling connector is an external plug-in end, and the rear end is electrically connected to the sampling circuit of the charge and discharge protection module.

[0015] The sampling circuit 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.

[0016] Optionally, the charge and discharge protection module is further provided with:

[0017] A transfer circuit. When there is current input to the charging plug, the electrical connection between the lithium-ion battery pack body and the discharge circuit is in an open state. The charging plug is electrically connected to the discharge plug through the transfer circuit to provide current for an external electrical device.

[0018] As can be seen from the above, the charging socket and the discharge socket, which are independent of each other, are integrated on the plug in this embodiment. Moreover, the charging socket and the discharge socket are independent of each other respectively, and can be respectively plugged in with a separate charging plug and a separate discharge plug in the prior art, or can be plugged in with a plug that integrates a charging plug and a discharge plug and matches the plug in this embodiment. At this time, for the further application principle, please refer to the corresponding description of the lithium-ion battery with the plug in this embodiment later. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 FIG. 1 is a three-dimensional structural schematic diagram of the plug provided in the first embodiment of the present invention;

[0021] Figure 2 FIG. 2 is a three-dimensional exploded structural schematic diagram of the plug provided in the first embodiment of the present invention;

[0022] Figure 3 FIG. 3 is a front view structural schematic diagram of the plug provided in the first embodiment of the present invention;

[0023] Figure 4 FIG. 4 is a left view structural schematic diagram of the plug provided in the first embodiment of the present invention;

[0024] Figure 5 FIG. 5 is a right view structural schematic diagram of the plug provided in the first embodiment of the present invention;

[0025] Figure 6 FIG. 6 is a sectional structural schematic diagram of the plug provided in the first embodiment of the present invention along the A-A direction;

[0026] Figure 7Schematic top view structure of the plug provided in the first embodiment of the present utility model;

[0027] Figure 8 Schematic bottom view structure of the plug provided in the first embodiment of the present utility model;

[0028] Figure 9 Schematic assembly structure of the plug provided in the first embodiment of the present utility model when inserted into the female connector;

[0029] Figure 10 Schematic three - dimensional view of the plug provided in the first embodiment of the present utility model when inserted into the female connector;

[0030] Figure 11 Schematic three - dimensional structure of the plug provided in the second embodiment of the present utility model;

[0031] Figure 12 Schematic top view structure of the plug provided in the second embodiment of the present utility model;

[0032] Figure 13 Schematic bottom view structure of the plug provided in the second embodiment of the present utility model;

[0033] Figure 14 Schematic front view structure of the plug provided in the second embodiment of the present utility model;

[0034] Figure 15 Schematic left view structure of the plug provided in the second embodiment of the present utility model;

[0035] Figure 16 Schematic right view structure of the plug provided in the second embodiment of the present utility model;

[0036] Figure 17 Schematic exploded view structure of the plug provided in the second embodiment of the present utility model;

[0037] Figure 18 Schematic cross - sectional view structure of the plug provided in the second embodiment of the present utility model taken along the B - B direction;

[0038] Figure 19 Schematic assembly structure of the plug provided in the second embodiment of the present utility model when inserted into the female connector;

[0039] Figure 20 Schematic three - dimensional view of the plug provided in the second embodiment of the present utility model when inserted into the female connector;

[0040] Figure 21 Schematic circuit principle diagram of the battery pack with a charging and discharging plug provided in the first and second embodiments of the present utility model;

[0041] Figure 22Schematic diagram of the transfer and assembly of two charging and discharging plugs provided in the first and second embodiments of the present utility model;

[0042] Figure 23 Schematic cross-sectional structure diagram when the two charging and discharging plugs provided in the first and second embodiments of the present utility model are connected.

[0043] 21: First insulating base; 211: First insulating socket; 212: Second insulating socket;

[0044] 213: First jack; 214: Second lateral snap part; 23: Charging female plug;

[0045] 24: Sampling female plug; 22: Discharging female plug; 221: Welding part;

[0046] 222: First lateral snap part; 25: Clamping part; 26: Metal jack; 27: Gap;

[0047] 28: Metal part; 281: End segment; 282: Bending part; 291: First lateral window part;

[0048] 292: Second lateral window part; 5: Conductive wire; 31: Female plug of the power supply of the electrical equipment;

[0049] 1: Second insulating base; 11: First chamber; 12: Second chamber; 13: Jack; 4: Hanging position;

[0050] 2: Discharging connector; 21: Metal sheet; 22: Gap; 3: Charging connector;

[0051] 4: Sampling connector; 5: Conductive wire; 6: Lateral snap part; 7: Import position; 8: Limiting part;

[0052] 9: Male connector; 10: Female connector. Detailed implementation manners

[0053] The present utility model will be described in detail below in conjunction with the drawings and specific embodiments. Here, the illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not limit the present utility model. Embodiment

[0054] See Figure 1-10 , shown in 21.

[0055] This embodiment provides a plug, which mainly includes a first insulating base 21, two independent discharging female plugs 22, and two independent charging female plugs 23.

[0056] The first insulating base 21 serves as the holding part of the plug and the mounting base for each connector. The discharge female connector 22 and the charging female connector 23 are both provided on the first insulating base 21. Specifically, the end of the first insulating base 21 that is inserted into and connected with other plugs is denoted as the front end, and the end opposite to the front end is denoted as the rear end.

[0057] At the front end of the first insulating base 21, there are provided a first insulating socket 211 and a second insulating socket 212 that protrude forward. The two insulating sockets are in an independent and separated state, specifically, there is a certain distance between them.

[0058] Inside the first insulating socket 211, there are provided 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 face 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.

[0059] The front ends of each discharge female connector 22 are respectively located inside their 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 each discharge female connector 22 are respectively provided with sockets for inserting male connectors. The rear ends of each discharge female connector 22 respectively extend out of the rear end of the first insulating base 21 from the rear sockets. In addition, welding parts 221 can be 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 equipment, so as to output current and supply power to external electrical equipment.

[0060] As an illustration of this embodiment, the discharge female connector 22 of this embodiment can be made of a copper part. For example, but not limited to, 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.

[0061] As an illustration of this embodiment, the discharge female connector 22 can be pre-placed in an injection mold when the first insulating base 21 is injection-molded, and each connector is integrally formed on the first insulating base 21 during injection molding.

[0062] As an illustration of this embodiment, the outer periphery of the middle part of each discharge female connector 22 in this embodiment is also provided with a first lateral buckle portion 222, and the hole wall of each first plug hole 213 of the first insulating socket 211 is also provided with a second lateral buckle portion 214 that is adapted to the position, shape and size of the first lateral buckle portion 222. After assembly, the first lateral buckle portion 222 of each discharge female connector 22 is buckled with the second lateral buckle portion 214 of the first plug hole 213 where it is located, and each discharge female connector 22 is positioned in each first plug hole 213 of the first insulating socket 211. When plugged in with the female plug 31 of the power supply of the external electrical equipment, each discharge connector is stable and does not move forward and backward under the plug-in and pull-out force.

[0063] At least two first plug holes 213 are provided in the second insulating socket 212, which are connected front to back and extend front to back. The front end plugs of the two first plug holes 213 are located at the front end surface of the second insulating socket 212, and the rear end plugs are located at the rear end of the first insulating base 21. A discharge female connector 22 is fixed in one of the first plug holes 213 of the second insulating socket 212, and another discharge female connector 22 is fixed in the other first plug hole 213.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] The structure of each sampling socket female part 24 can be, but is not limited to, the same as that of each charging socket female part 23. Specifically, a socket is provided at the front end of the sampling socket female part 24, and the rear end of the sampling socket female part 24 extends out of the rear end of the first insulating base 21, or extends out of the rear end of the first insulating base 21 through the wire connected to its rear end for external connection.

[0068] During application, the sampling socket female part 24 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 conductive wire 5, samples the voltage of this electrical node, inputs the sampling result into the control circuit, and at the same time transmits 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 configured with the sampling socket female part 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 side to be charged, further improving the charging balance and safety, avoiding overcharging, and prolonging the service life of the battery pack.

[0069] As an illustration of this embodiment, each charging socket female part 23 and sampling socket female part 24 of this embodiment are mainly made of metal sheet metal parts. A clamping part 25 is respectively formed at the rear end of the metal sheet metal parts. Each clamping part 25 can be, but is not limited to, formed by bending the sheet metal at the end of the metal sheet metal part. The bare conductive wire core at the front end of a conductive wire 5 is tightly clamped in each clamping part 25 respectively, and each conductive wire 5 extends out of 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 conductive wire cores at the rear end of the wire harness can be commonly connected to a multi-pin plug. When plugging in with the charge and discharge control module of the battery pack, the plugging in of a multi-pin plug realizes the electrical connection of multiple conductive 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, and successful plugging can only be achieved when the anti-reverse plugging parts of the plugging pin plugs match, avoiding reverse connection.

[0070] At the front end of each metal sheet metal part, a metal jack 26 with an opening facing forward is respectively formed for the plug-in male part at the opposite end to be inserted to achieve electrical connection. As an illustration of this embodiment, each metal jack 26 can be, but is not limited to, respectively 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. The two ends of the bent metal part 28 do not closely adhere and fix to each other, but leave a certain gap 27 facing each other. 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 plug-in male part 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 restriction of the inner wall of the first jack 213 where the metal jack 26 is located, the hole wall of the metal jack 26 closely adheres between the outer wall of the inserted plug-in male part and the inner wall of the first jack 213 of the second insulating socket 212. Under the action of the elastic deformation force of the metal jack 26, it is not easy to come off during plugging and unplugging.

[0071] As an illustration of this embodiment, a bent metal part 28 is further respectively provided in each metal jack 26, such as, but not limited to, a metal strip or a metal sheet with the ability of elastic deformation. The front end of the metal part 28 is fixed in the metal jack 26 or extends out of the metal jack 26 and is fixed in the first jack 213 on the first insulating base 21 or extends out of the first jack 213 and is fixed on the first insulating base 21. The middle section and the rear end of the metal part 28 are both free ends and can elastically stretch under pressure. When an external plug-in male part is inserted into the metal jack 26 in the first jack 213 of the second insulating socket 212, the plug-in male part closely adheres to the bent metal part 28 in the metal jack 26. Under the pressure of the plug-in male part, the metal part 28 elastically deforms. In addition to closely contacting the inner wall of the metal jack 26, the inserted metal male part further closely contacts the bent metal part 28 in the metal jack 26, and it is further not easy to loosen. Further improves the plugging reliability of the second insulating socket 212 when plugged into the plug of an external charging power supply.

[0072] As an illustration of this embodiment, lateral window parts (denoted as first lateral window parts 291) can be further respectively opened on the sides of each first jack 213 of the second insulating socket 212, and each first lateral window part 291 is respectively located on the side of the second insulating socket 212.

[0073] Correspondingly, second lateral window parts 292 are respectively opened on each metal jack 26. When each charging plug-in female part 23 and sampling plug-in female part 24 are respectively inserted into each first jack 213 of the second insulating socket 212, each second lateral window part 292 is respectively opposite to and located within each first lateral window part 291, forming lateral window parts for each metal jack 26 to communicate with the outside.

[0074] 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 positioned in front of the rear end face of the first side window portion 291, being in contact with or almost in contact therewith. Moreover, at least one bending portion 282 is formed in the middle section of the metal piece 28. These bending 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 is in contact with at least one bending portion 282 in the middle section of the metal piece 28, the front end of the metal piece 28 abuts tightly against the rear end face of the first side window portion 291 for fixed positioning, the free end at the rear of the metal piece 28 extends rearward, the middle section of the metal piece 28 undergoes elastic deformation and deflects towards the second side window portion 292, and the inserted male plug is tightly confined between the elastically deformed metal piece 28 and the metal jack 26, being not easily disengaged and having close contact, ensuring the reliability of the electrical connection and reducing the contact resistance.

[0075] As an illustration of this embodiment, a transfer circuit for electrically connecting 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 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.

[0076] The plug of this embodiment can be applied to lithium-ion batteries. The 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.

[0077] The lithium-ion battery pack body includes a plurality of lithium-ion battery cells, and the cells are electrically connected in series, in parallel, or in a combination of both.

[0078] 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, and the control circuit controls the operation of the charging circuit and the discharge circuit.

[0079] Among them, the input end of the discharge circuit is electrically connected to the positive electrode and the negative electrode 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.

[0080] The output end of the charging circuit is electrically connected to the positive electrode and the negative electrode 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 overcharging.

[0081] 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 facilitating the external connection of users and saving the occupied space of the plug. 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. Embodiment

[0082] See Figure 11-21 as shown.

[0083] This embodiment provides a plug, which mainly includes a second insulating base 1, a discharge connector 2, and a charging connector 3.

[0084] The second insulating base 1 is the handheld part of the plug. The discharge connector 2 and the charging connector 3 are both arranged on the second insulating base 1. Specifically, taking the end of the second 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 second insulating base 1. The two chambers are independent of each other, and the openings are both located at the front end.

[0085] In this embodiment, the first chamber 11 is used as the chamber of the discharge connector 2. The discharge connector 2 includes a positive discharge connector 2 and a negative discharge connector 2 which are independent of each other. The middle parts of the positive discharge connector 2 and the negative discharge connector 2 are respectively fixed in the second 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 realize 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 second 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] In this embodiment, the second chamber 12 serves as the chamber for the charging connector 3. The charging connector 3 includes at least 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 second insulating base 1, and the front ends are separated and 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 into 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 second insulating base 1, or extend out of the rear end of the second insulating base 1 through the connected conductive wires 5 for external connection.

[0091] As shown in this embodiment, a sampling connector 4 is further provided 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 spacing 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 second insulating base 1 or extends out of the rear end of the second insulating base 1 through the connected conductive wires 5 for external connection. In 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 conductive wire 5 to sample the voltage of the 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.

[0092] 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 of each metal connector is fixed in the second 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 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 from the rear end of the second insulating base 1. As an illustration of this embodiment, the wire cores 5 at the rear end 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.

[0093] As an illustration of this embodiment, it is possible, but not limited to, pre-placing the discharge connector 2, the charging connector 3, and the sampling connector 4 in the injection mold when the second insulating base 1 is injection molded, and integrally molding each connector on the second insulating base 1 during injection.

[0094] 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 second insulating base 1 through an assembly process. Specifically, on the second insulating base 1, there are preset jacks 13 for inserting the charging connector 3 that communicate with the first chamber 11, and jacks 13 for inserting the discharge connector 2 and the sampling connector 4 that communicate with the second chamber 12. At the rear end of the second insulating base 1, there is an insertion opening for the connector to be inserted into the jack 13.

[0095] As an illustration of this embodiment, an inverted position 14 is further provided on the hole wall of the jack 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 jacks 13 from the sockets at the rear end of the second 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 position 14 on the hole wall, 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 jack 13 and are located in the second chamber 12. The adoption of the lateral locking portion 6 and the inverted position 14 is beneficial to accurate positioning during assembly, improving the assembly efficiency and assembly effect. Moreover, with this design, when 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.

[0096] As an illustration of this embodiment, an introduction position 7 is further provided on the hole wall of each jack 13 for inserting the charging connector 3 and / or the sampling connector 4. The introduction position 7 is located at the rear end of the inverted position 14 and at the front end of the socket. The introduction position 7 and the inverted position 14 are respectively located on opposite hole wall sides. Taking the inverted position 14 as a lateral recess and the inverted position 14 being located on the lower hole wall of the jack 13 as an example, the introduction position 7 is located on the upper hole wall of the jack 13. In the direction from the rear to the front, the distance between the hole wall at the introduction position 7 and the opposite hole wall gradually becomes narrower. When the metal connector is inserted into the jack 13, the lateral locking portion 6 of the metal connector faces downward. The metal connector passes through the rear jack 13 through the introduction position 7, and the introduction position 7 is in close contact with the lateral introduction position 7, acting on the upper end of the metal connector. As the distance between the introduction position 7 and the opposite hole wall decreases, the introduction position 7 causes the metal connector to elastically deform and shift towards the inverted position 14 until the lateral locking portion 6 at the front section of the metal connector enters the inverted position 14, and the metal connector elastically returns to its natural state, and the metal connector is positioned here. As can be seen from the above, the adoption of the introduction position 7 is beneficial to the accurate positioning of the assembly of the metal connector and improves 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 of the front section of the flat metal connector.

[0097] As an illustration of this embodiment, a limiting portion 8 with a lateral protrusion can also be provided in the middle of the discharge connector 2. During installation, the discharge 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 jack 13, and then the discharge connector 2 stops and is positioned here.

[0098] The middle parts of the first metal connectors are limited within the second 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 of the second chamber.

[0099] 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 supply 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 supply to the discharge plug, and outputs it to the external electrical device through the discharge connector to drive the electrical device to work.

[0100] As can be seen from the above, the plug in this embodiment integrates independent charging sockets and discharge sockets. Moreover, the charging socket and the discharge socket are independent of each other and can be respectively plugged in with the separate charging plug and the separate discharge plug of the prior art, or can be plugged in with the plug integrating the charging plug and the 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.

[0101] The plug of this embodiment can be applied to lithium-ion batteries. 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.

[0102] 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 in a combination of both.

[0103] 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.

[0104] 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.

[0105] The output terminal of the charging circuit is electrically connected to the positive and negative electrodes of each lithium-ion cell within the battery pack body, and the input terminal is electrically connected to the rear end of the charging connector 3 of the plug in this embodiment. When the plug in 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 performs online control on the charging of each cell according to the voltage of the battery pack body to achieve balanced charging and avoid overcharging.

[0106] 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 occupied space of plugging. And compared with the prior art, during the charging process, the line of the discharge interface becomes the voltage sampling circuit during the charging process, and during the discharging process, the line of the charging interface becomes the voltage sampling circuit during 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.

[0107] In summary, referring to Figure 22 、 23 As shown, adopting the technical solution of this embodiment, one of the plugs of Embodiment 1 and 2 is configured on the lithium-ion battery, and the other of the plugs of Embodiment 1 and 2 is configured as a matching adapter plug to increase the range of power connectors of the electrical equipment adapted by this lithium-ion battery through the adapter plug and improve the application flexibility of the battery pack.

[0108] The above-described embodiments do not constitute a limitation on the protection scope of the technical solution. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the above embodiments shall be included within the protection scope of the technical solution.

Claims

1. A lithium-ion battery pack, 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; The charge and discharge protection module is fixed to the end of the lithium-ion battery pack body and includes: 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; A charging and discharging plug, comprising: A discharge plug, wherein the front end of the discharge connector in the discharge plug is an external plug end, and the rear end is electrically connected to the discharge circuit. A charging plug has a gap between it and the discharging plug, the front end of the charging connector on the charging plug is an external plug end, and the rear end is electrically connected to the charging circuit.

2. The lithium-ion battery pack according to claim 1, characterized in that: The charging plug is also provided with a sampling connector, the front end of which is an external plug-in terminal, and the rear end of which is electrically connected to the sampling circuit of the charging and discharging protection module. The sampling circuit is electrically connected to any electrical node in the lithium-ion battery pack body, and is also electrically connected to the control circuit and the sampling connector of the plug.

3. The lithium-ion battery pack according to claim 1, wherein: The charge and discharge protection module is also provided with: The switching circuit is configured such that when current is input to the charging plug, the electrical connection between the lithium-ion battery pack body and the discharge circuit is in an open circuit state, and the charging plug is electrically connected to the discharge plug through the switching circuit to provide current to external electrical equipment.

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