CN112271769A

CN112271769A - Battery pack and device using the same

Info

Publication number: CN112271769A
Application number: CN202011089102.7A
Authority: CN
Inventors: 姚姝; 谢树扬; 黄开锐; 陈山; 宁顺刚
Original assignee: Ningde Amperex Technology Ltd; Dongguan Nvt Technology Co Ltd
Current assignee: Ningde Amperex Technology Ltd; Dongguan Nvt Technology Co Ltd
Priority date: 2020-10-13
Filing date: 2020-10-13
Publication date: 2021-01-26
Anticipated expiration: 2040-10-13
Also published as: CN112271769B

Abstract

The invention provides a battery pack and a device using the same. The first battery includes a first cell and a first circuit assembly, the first circuit assembly being provided with a first interface. The second battery comprises a second battery core and a second circuit assembly, and the second circuit assembly is provided with a second interface and a third interface. The first circuit assembly and the second circuit assembly constitute a circuit system, the circuit system is provided with a switching unit, and the switching unit is used for switching the power supply mode into a first battery power supply mode or a second battery power supply mode. When the first battery is dead, the switching unit can switch the battery pack into a second battery power supply mode, the first battery can be detached from the second battery for charging, and a device using the battery pack cannot be powered off and interrupted due to the fact that the first battery is taken out, so that continuous stability of the device using the battery pack during working is guaranteed.

Description

Battery pack and device using the same

Technical Field

The present invention relates to the field of battery technology, and more particularly, to a battery pack and a device using the same.

Background

For electronic equipment which is usually powered by a detachable battery, such as an intelligent door lock and an intelligent doorbell, when the battery is dead, the electronic equipment needs to be shut down and replaced by another standby battery or be charged by direct charging. However, turning off the battery and replacing it will interrupt or stop the current operation of the device for a while, and if using direct charging, it will have to be close to the power supply, which causes great inconvenience to the user. At present, batteries of similar electronic equipment all adopt single batteries, and once the batteries are used up, the batteries can be taken out and replaced. There is another scheme for reserving one battery, but another battery can be installed only after one battery is taken out. Also the device may be out of operation for some time.

Disclosure of Invention

In view of the problems of the background art, it is an object of the present invention to provide a battery pack and a device using the battery pack, which has a simple structure, is easy to install and detach, and can ensure that the device using the battery pack can normally operate when the battery is replaced.

In order to achieve the above object, the present invention provides a battery pack including a first battery and a second battery. The first battery comprises a first battery core and a first circuit assembly connected to the first battery core, and the first circuit assembly is provided with a first interface. The second battery comprises a second battery core and a second circuit assembly connected to the second battery core, and the second circuit assembly is provided with a second interface and a third interface. The first interface of the first battery is detachably connected to the second interface of the second battery, and the third interface of the second battery is used for connecting a device using a battery pack. The first circuit assembly and the second circuit assembly form a circuit system of the battery pack, the circuit system is provided with a switching unit, and the switching unit is used for switching a power supply mode of the battery pack into a first battery power supply mode or a second battery power supply mode.

In a battery according to some embodiments, the first circuit assembly is further provided with a fourth interface for connecting an external charger.

In a battery according to some embodiments, the second battery is an L-shaped structure having a main body portion and an extension portion. The main body portion of the second battery is located on the first battery side in the longitudinal direction, and the extension portion is located on the first battery side in the width direction.

In a battery according to some embodiments, the second battery is formed in a ring-shaped structure having an intermediate through groove, and the first battery is disposed in an intermediate groove of the second battery.

In a battery according to some embodiments, the first battery further includes a first upper case and a first lower case that together house the first cell and the first circuit board. The second battery further comprises a second upper shell and a second lower shell, and the second upper shell and the second lower shell contain the second battery cell and the second circuit board together.

In the battery according to some embodiments, the second lower case of the second battery is formed with a cavity accommodating the first battery, the cavity being surrounded by at least three walls.

In the battery according to some embodiments, the first battery and the second battery cell of the second battery are arranged side by side in a length direction in a second lower case of the second battery. The second circuit assembly and the second cell are located on the same side of the first battery. The second upper housing and the second lower housing of the second battery together house the second cell, the second circuit assembly, and the first battery.

In a battery according to some embodiments, the first battery and the second circuit component of the second battery are arranged side by side in a length direction. The second battery cell is located on one side of the first battery in the width direction. The second upper housing and the second lower housing of the second battery together house the second cell, the second circuit assembly, and the first battery.

In the battery according to some embodiments, at least one of the dimensions of the second battery in the length direction, the width direction, and the thickness direction is equal to the dimension of the entire battery pack in the corresponding direction.

The invention also provides a device using the battery pack, which comprises the battery pack and a battery bin for accommodating the battery pack, wherein the battery pack provides electric energy for the device.

The invention has the following beneficial effects:

since the first battery and the second battery can share the battery compartment of the device using the battery pack together, there is no need to additionally prepare a spare battery, and even no need to prepare a storage space for the spare battery, so that the risk of losing the spare battery can be reduced. And when the first battery is dead, the switching unit can switch the battery pack into a second battery power supply mode, and based on the detachable connection between the first battery and the second battery, the first battery can be detached from the second battery for charging in the second battery power supply state, and at the moment, because the device using the battery pack is not powered off and interrupted due to the removal of the first battery, the continuous stability of the device using the battery pack during operation is ensured.

Drawings

Fig. 1 is a schematic diagram of some embodiments of a device using a battery pack according to the present invention.

Fig. 2 is a perspective view of a battery according to the first embodiment.

Fig. 3 is an exploded view of fig. 2.

Fig. 4 is an exploded view of the first battery in fig. 3.

Fig. 5 is an exploded view of the second battery in fig. 3.

Fig. 6 is a perspective view of a battery according to a second embodiment.

Fig. 7 is an exploded view of fig. 6.

Fig. 8 is an exploded view of the first battery in fig. 7.

Fig. 9 is an exploded view of the second battery in fig. 7.

Fig. 10 is a perspective view of a battery according to a third embodiment.

Fig. 11 is an exploded view of fig. 10.

Fig. 12 is an exploded view of the first battery in fig. 10.

Fig. 13 is an exploded view of the second battery in fig. 10.

Fig. 14 is a perspective view of a battery according to a fourth embodiment.

Fig. 15 is an exploded view of fig. 14.

Fig. 16 is an exploded view of the first battery in fig. 15.

Fig. 17 is an exploded view of the second battery in fig. 15.

Wherein the reference numerals are as follows:

1 first battery 221 first protection plate

11 first cell 222 second protective plate

12 first circuit assembly 223 connecting line

12A first interface 224 connecting sheet

12B fourth interface 22A second interface

13 first Upper housing 22B third interface

13A first recess 23 second Upper housing

13B first opening 23A second notch

14 first lower case 23B second opening

14A third recess 24 second lower housing

14B third opening 24A first receiving portion

2 second battery 24B second receiving part

2A Main body portion C switching unit

2B extension part L length direction

Width direction of 2C middle through groove W

21 thickness direction of second cell H

22 second circuit assembly

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The "plurality" in the present application means two or more (including two), and similarly, "plural" means two or more (including two) and "plural" means two or more (including two).

The battery pack described in the embodiment of the present application is applicable to various devices using battery packs, for example, smart door locks, mobile phones, portable devices, notebook computers, battery cars, electric automobiles, ships, spacecraft, electric toys, electric tools, and the like; the battery pack provides power to the device. The battery pack described in the embodiments of the present application is not limited to be applied to the above-described devices, but may be applied to all devices using the battery pack. For example, fig. 1 shows a structure of an intelligent door lock 2000, a battery pack 1000 is accommodated in a battery compartment of the intelligent door lock 2000, and the battery pack 1000 provides power for the intelligent door lock 2000 to meet the power consumption requirement when the intelligent door lock is used.

Referring to fig. 2 to 17, a battery pack 1000 according to some embodiments includes a first battery 1 and a second battery 2. The first battery 1 is detachably connected to the second battery 2, and the first battery 1 and the second battery 2 are accommodated in the battery compartment of the smart door lock 2000 together.

Since the first battery 1 and the second battery 2 can share the battery compartment of the smart door lock 2000 together, there is no need to prepare an additional backup battery, and even no storage space is prepared for the backup battery, so that the risk of losing the backup battery can be reduced.

In some embodiments, the dimension of the second cell 2 in at least one of the length direction L, the width direction W, and the thickness direction H is equal to the dimension of the battery pack 1000 as a whole in the corresponding direction. A detachable battery-powered electronic device, such as a smart door lock, is generally used, which uses one or more of the dimensions of the battery pack 1000 in the length direction L, the width direction W, and the thickness direction H as a whole, and is generally matched with the dimensions of the battery compartment in the corresponding directions, so that the battery pack and the battery compartment are in contact in the corresponding directions to form an acting point, so that the battery pack can be stably located in the battery compartment. In the embodiment of the present application, by making the dimension of the second battery 2 in at least one direction equal to the dimension of the battery pack 1000 as a whole in the corresponding direction among the dimensions in the length direction L, the width direction W and the thickness direction H, when the first battery 1 is detached from the second battery 2 and taken out from the battery compartment, the second battery 2 has an acting point formed by contacting with the battery compartment in at least one direction, thereby ensuring that the second battery 2 can be continuously and stably mounted in the battery compartment of the smart door lock 2000.

Referring to fig. 4-5, 8-9, 12-13, and 16-17, the first battery 1 includes a first cell 11 and the second battery 2 includes a second cell 21. In some embodiments, the first cell 11 and the second cell 21 are lithium cells.

Because of the chemical characteristics of the lithium battery, in the normal use process, the lithium battery performs a chemical positive reaction in which electric energy and chemical energy are converted into each other, but under certain conditions, such as overcharge, overdischarge, and overcurrent, chemical side reactions occur inside the battery core, which can seriously affect the performance and service life of the battery after the side reactions are intensified, and a large amount of gas may be generated, so that the internal pressure of the battery is rapidly increased and then explodes to cause a safety problem. Referring to fig. 2 to 17, the first battery 1 includes a first circuit assembly 12 having a protection function, and the first circuit assembly 12 is electrically connected to the first battery cell 11; the second battery 2 includes a second circuit assembly 22 having a protection function, and the second circuit board 221 is electrically connected to the second battery cell 21. Wherein the first circuit assembly 12 and the second circuit assembly 22 each include a protective plate. The protection board is composed of an electronic circuit, and the voltage of the battery cell and the current in the charge-discharge loop can be monitored accurately at any time. The protection board generally includes electronic components such as MOS switches, precision resistors, capacitors, and auxiliary devices FUSE, PTC, NTC, memory, connectors, and FPC.

In the battery pack 1000, the first circuit assembly 12 of the first battery 1 and the second circuit assembly 22 of the second battery 2 form a circuit system of the battery pack 1000, and the circuit system is provided with a switching unit C (such as a single chip microcomputer), and the switching unit C can freely switch among a first battery 1 power supply mode, a second battery 2 power supply mode, and a mode in which the first battery 1 supplies power while charging the second battery 2, thereby ensuring safe and orderly operation of the battery pack 1000.

Specifically, during the use of the battery pack 1000, under the control of the circuit system, the switching unit C preferentially switches the battery pack 1000 to the power supply mode of the first battery 1 for the smart door lock 2000. When the first battery 1 is dead, the switching unit C switches the battery pack 1000 to the power supply mode of the smart door lock 2000 by using the second battery 2. And, based on the connection of dismantling between first battery 1 and the second battery 2, under the state that second battery 2 is the power supply of intelligent lock 2000, first battery 1 can be dismantled from second battery 2 and in order to charge, because intelligent lock 2000 can not break off the power supply and interrupt work because of taking out of first battery 1 this moment to intelligent lock 2000's continuous stability has been guaranteed.

Further, when the first battery 1 is fully charged and reloaded into the battery compartment of the smart door lock 2000, the switching unit C may switch the battery pack 1000 to a mode in which the first battery 1 supplies power to the smart door lock 2000. Meanwhile, under the control of the circuit system, the switching unit C can also switch the battery pack 1000 to a charging mode in which the first battery 1 supplies power to the smart door lock 2000 and the second battery 2 is charged, so that the second battery 2 always has enough electric quantity for standby.

Specifically, in the battery pack 1000, the switching unit C may be integrally disposed in the first circuit assembly 12 of the first battery 1 and communicatively connected to the second circuit assembly 22 of the second battery 2 or the switching unit C may be integrally disposed in the second circuit assembly 22 of the second battery 2 and communicatively connected to the first circuit assembly 12 of the first battery 1, thereby implementing information interaction among the first circuit assembly 12, the second circuit assembly 22 and the switching unit C, and further ensuring that the switching unit C can implement free switching of the power supply mode.

Referring to fig. 2 to 17, the second circuit assembly 22 of the second battery 2 is provided with a second interface 22A and a third interface 22B. The second battery 2 is detachably connected to the first battery 1 through the second interface 22A of the second circuit assembly 22, and the battery pack is electrically connected to the intelligent door lock 2000 through the third interface 22B, and when the first battery 1 and the second battery 2 are in a connection state, under the control of the circuit system of the battery pack 1000, the first battery 1 can also perform quick charging on the second battery 2 through the second interface 22A of the second circuit assembly 22.

In some embodiments, the first circuit assembly 12 of the first battery 1 is provided with only the first interface 12A. The first battery 1 can be detachably connected to the second interface 22A of the second battery 2 through the first interface 12A of the first circuit module 12, and when the first battery 1 is detached from the second battery 2, the second battery 2 can be electrically connected to an external charger through the second interface 22A, so as to realize quick charging.

In some embodiments, the first circuit assembly 12 of the first battery 1 may be provided with both the first interface 12A and the fourth interface 12B. The first interface 12A is an interface matched with the second interface 22A of the second battery 2, and the fourth interface 12B is a standard interface. Here, based on the configuration of the fourth interface 12B, the first battery 1 can be charged by a conventional charger, and the first battery 1 can also be charged in an unretracted state (at this time, the switching unit C of the circuit system of the battery pack 1000 has switched the battery pack 1000 to the power supply mode of the second battery 2 for the smart door lock 2000, and the first battery 1 and the second battery 2 are only mechanically connected but not electrically connected).

In some embodiments, the first interface 12A of the first battery 1 can be connected to the second interface 22A of the second battery 2 by plugging or face-to-face abutting (i.e., face-to-face contact connection).

In some embodiments, referring to fig. 4-5, 8-9, and 11-17, the first battery 1 further includes a first upper casing 13 and a first lower casing 14, the first upper casing 13 and the first lower casing 14 together housing the first cell 11 and the first circuit assembly 12. The second battery 2 further includes a second upper case 23 and a second lower case 24, and the second upper case 23 and the second lower case 24 together house the second cell 21 and the second circuit assembly 22.

In some embodiments, referring to fig. 2-5, the second battery 2 is an L-shaped structure, and the second battery 2 has a main portion 2A and an extension portion 2B. Main body portion 2A of second battery 2 is located on first battery 1 side in length direction L, and extension portion 2B is located on first battery 1 side in width direction W, and first battery 1 and second battery 2 are equivalent to being tiled in the battery compartment of smart door lock 2000 at this time.

In the implementation of the present application, the sizes of the second battery 2 in the length direction L and the width direction W are respectively equal to the size of the battery pack 1000 in the corresponding direction, that is, the sizes of the second battery 2 in the length direction L and the width direction W are respectively matched with the size of the battery compartment of the intelligent door lock 2000 in the corresponding direction, so that when the first battery 1 is taken out from the battery compartment, the second battery 2 has an acting point with the battery compartment in the length direction L and the width direction W, thereby ensuring that the second battery 2 can be continuously and stably installed in the battery compartment of the intelligent door lock 2000.

Referring to fig. 4, the first battery 1 has a rectangular structure, and accordingly, the first upper case 13 and the first lower case 14 of the first battery 1 are also formed in a rectangular structure.

Further, referring to fig. 4, the first cell 11 and the first circuit assembly 12 of the first battery 1 are arranged side by side in the length direction L. The first upper case 13 is formed with a first recess 13A and a first opening 13B. The first recess 13A receives the first interface 12A of the first circuit assembly 12 such that the first interface 12A is exposed outside the first upper case 13 to be connected with the second interface 22A of the second battery 2. The first opening 13B is used for the fourth interface 12B to penetrate through, so that the fourth interface 12B extends out of the first upper shell 13 to be connected with an external charger.

Referring to fig. 3 and 5, the second lower case 24 of the second battery 2 has a first receiving portion 24A and a second receiving portion 24B, the first receiving portion 24A receives the second battery cell 21, and the second receiving portion 24B is located at one end of the first receiving portion 24A in the longitudinal direction L and receives the second circuit assembly 22. At this time, the first receiving portion 24A and the first receiving portion 24A of the second lower case 24 constitute the main body portion 2A of the second battery 2 together with the portion corresponding to the second upper case 23, and the second receiving portion 24B constitute the extension portion 2B of the second battery 2 together with the portion corresponding to the second upper case 23.

Further, referring to fig. 5, the second upper case 23 is formed with a second recess 23A and a second opening 23B. The second recess 23A accommodates the third interface 22B of the second circuit component 22 such that the third interface 22B is exposed outside the second upper case 23; the second opening 23B is provided for the second port 22A to penetrate through, so that the second port 22A extends out of the second upper housing 23.

In some embodiments, referring to fig. 6-9, the second cell 2 is formed in a ring-shaped structure having a central through groove 2C, and the first cell 1 is disposed in the central groove 2C of the second cell 2. When the battery pack 1000 is installed in the smart door lock 2000, the four sidewalls of the second battery 2 all abut against the sidewalls of the battery compartment.

In the implementation of the present application, the sizes of the second battery 2 in the length direction L, the width direction W and the thickness direction H are respectively equal to the size of the battery pack 1000 in the corresponding direction, that is, the sizes of the second battery 2 in the length direction L, the width direction W and the thickness direction H are respectively matched with the sizes of the battery compartment of the intelligent door lock 2000 in the corresponding direction, so that when the first battery 1 is taken out from the battery compartment, the second battery 2 has the acting force point with the battery compartment in the length direction L, the width direction W and the thickness direction H, and therefore it is ensured that the second battery 2 can be continuously and stably installed in the battery compartment of the intelligent door lock 2000.

Referring to fig. 7 and 8, the first battery 1 has a rectangular structure, and accordingly, the first upper case 13 and the first lower case 14 of the first battery 1 are also formed in a rectangular structure.

Further, referring to fig. 8, the first cell 11 and the first circuit assembly 12 of the first battery 1 are arranged side by side in the length direction L. The first upper case 13 is formed with a first recess 13A and a first opening 13B. The first recess 13A receives the first interface 12A of the first circuit assembly 12 such that the first interface 12A is exposed outside the first upper case 13 to be connected with the second interface 22A of the second battery 2. The first opening 13B is used for the fourth interface 12B to penetrate through, so that the fourth interface 12B extends out of the first upper shell 13 to be connected with an external charger.

Referring to fig. 7 and 9, the second upper case 23 of the second battery 2 is formed with an upper cavity, and the second lower case 24 is formed with a lower cavity, which communicate and form the intermediate through groove 2C.

Further, referring to fig. 9, the second upper case 23 is formed with a second recess 23A and a second opening 23B. The second recess 23A receives the third interface 22B of the second circuit assembly 22 such that the third interface 22B is exposed outside the second upper case 23 to be connected with the smart door lock 2000. The second opening 23B faces the middle through groove 2C and is used for the second interface 22A to penetrate through, so that the second interface 22A extends into the middle through groove 2C and is connected with the first interface 12A of the first battery 1 in the middle through groove 2C.

Referring to fig. 9, the second lower case 24 has a first receiving portion 24A and a second receiving portion 24B, the first receiving portion 24A receives the second cell 21, and the second receiving portion 24B is provided at a distance from the first receiving portion 24A in the longitudinal direction L and receives a portion of the second circuit assembly 22.

Further, referring to fig. 9, the second circuit assembly 22 includes a first protection plate 221, a second protection plate 222, and a connection line 223, the first protection plate 221 is located in the second receiving portion 24B, the second protection plate 222 is located in the first receiving portion 24A and is located at one end of the second cell 21 in the width direction W and is connected to the second cell 21, and the connection line 223 connects the first protection plate 221 and the second protection plate 222.

Referring to fig. 10 to 17, the second lower case 24 of the second battery 2 is formed with a cavity for accommodating the first battery 1, and the cavity is surrounded by at least three wall surfaces. At this time, the second upper case 23 and the second lower case 24 of the second battery 2 together house the second battery cell 21, the second circuit assembly 22, and the first battery 1. When the battery pack 1000 is installed in the smart door lock 2000, the four sidewalls of the second battery 2 all abut against the sidewalls of the battery compartment.

Specifically, in some embodiments, referring to fig. 10-13, the first battery 1 and the second battery cell 21 of the second battery 2 are disposed side-by-side in the length direction L in the second lower case 24 of the second battery 2, and the second circuit assembly 22 and the second battery cell 21 are located on the same side of the first battery 1. The second upper case 23 cooperates with the second lower case 24 and houses the second battery cell 21, the second circuit assembly 22, and the first battery 1 together.

Referring to fig. 11 and 12, the first upper case 13 of the first battery 1 is formed with a first recess 13A and a first opening 13B. The first lower case 14 is formed with a third recess 14A.

The first opening 13B of the first upper housing 13 is used for the fourth interface 12B to penetrate through, so that the fourth interface 12B extends out of the first upper housing 13 to be connected with an external charger. The third recess 14A of the first lower case 14 and the first recess 13A of the first upper case 13 face the second interface 22A of the second circuit assembly 22, and the first interface 12A is exposed outside the first upper case 13 and the first lower case 14 to be connected to the second interface 22A of the second battery 2. At this time, the first header 12A and the second header 22A are butted in the width direction W.

Referring to fig. 13, the second upper case 23 of the second battery 2 is formed with a second notch 23A. The second recess 23A receives the third interface 22B of the second circuit assembly 22 such that the third interface 22B is exposed outside the second upper case 23 to be connected with the smart door lock 2000.

In order to achieve the connection between the first and

second batteries

1 and 2, the second circuit assembly 22 may be formed in an L-shaped structure. Specifically, referring to fig. 13, the second circuit assembly 22 includes a first protection plate 221, a second protection plate 222, and a connection piece 224. The first protective plate 221 is located on the second cell 21 side in the longitudinal direction L. The second protective plate 222 is located on the second cell 21 side in the width direction W and extends to the outside of the first battery 1. The connecting piece 224 connects the first protection plate 221 and the second protection plate 222. The second interface 22A is disposed on a portion of the second protection plate 222 that exceeds the second cell 21 in the length direction L, and the third interface 22B is disposed on the first protection plate 221.

In some embodiments, referring to fig. 14 to 17, the second circuit assemblies 22 of the first battery 1 and the second battery 2 are arranged side by side in the length direction L, and the second battery cell 21 is located on one side of the first battery 1 in the width direction W. The second upper case 23 and the second lower case 24 of the second battery 2 cooperate and house the second battery cell 21, the second circuit assembly 22, and the first battery 1 together.

Referring to fig. 15 and 16, the first upper case 13 of the first battery 1 is formed with a first opening 13B. The first lower case 14 is formed with a third opening 14B. The first opening 13B is used for the fourth interface 12B to penetrate through so as to be connected with an external charger. The third opening 14B is provided facing the second interface 22A of the second battery 2 and into which the second interface 22A is inserted to be connected with the first interface 12A of the first battery 1.

Referring to fig. 17, second lower case 24 of second battery 2 has first receiving portion 24A and second receiving portion 24B. The first accommodation portion 24A accommodates the second cell 21, and the second accommodation portion 24B is provided side by side with the first accommodation portion 24A in the width direction W and accommodates the first battery 1. The second circuit component 22 extends in the width direction W, and a part of the second circuit component 22 is located in the first receiving portion 24A and a part is located in the second receiving portion 24B.

Referring to fig. 17, the second upper case 23 of the second battery 2 is formed with a second recess 23A, and the second recess 23A receives the third interface 22B of the second circuit assembly 22 such that the third interface 22B is exposed outside the second upper case 23 to be connected with the smart door lock 2000.

Claims

1. A battery pack comprising a first battery and a second battery, characterized in that:

The first battery includes a first battery cell and a first circuit component connected to the first battery core, and the first circuit component is provided with a first interface;

The second battery includes a second battery cell and a second circuit component connected to the second battery core, and the second circuit component is provided with a second interface and a third interface;

The first interface of the first battery is detachably connected to the second interface of the second battery, and the third interface of the second battery is used for connecting a device using a battery pack;

The first circuit component and the second circuit component constitute a circuit system of the battery pack, the circuit system is provided with a switching unit, and the switching unit is used to switch the power supply mode of the battery pack to the first battery power supply mode or The second battery powered mode.

2 . The battery pack according to claim 1 , wherein the first circuit component is further provided with a fourth interface, and the fourth interface is used for connecting an external charger. 3 .

3. The battery pack according to claim 1, wherein,

the second battery has an L-shaped structure, and the second battery has a main body part and an extension part;

The main body portion of the second battery is located on the side of the first battery in the longitudinal direction, and the extension portion is located on the side of the first battery in the width direction.

4 . The battery pack according to claim 1 , wherein the second battery is an annular structure with a middle through groove, and the first battery is arranged in the middle groove of the second battery. 5 .

5. The battery pack according to claim 1, wherein,

The first battery further includes a first upper casing and a first lower casing, and the first upper casing and the first lower casing accommodate the first battery cell and the first circuit board together;

The second battery further includes a second upper case and a second lower case, and the second upper case and the second lower case together accommodate the second battery cell and the second circuit board.

6 . The battery pack according to claim 5 , wherein a cavity for accommodating the first battery is formed in the second lower case of the second battery, and the cavity is at least surrounded by three walls. 7 . .

7. The battery pack according to claim 6, wherein,

The first battery and the second cell of the second battery are arranged side by side in the second lower casing of the second battery in the length direction;

the second circuit assembly and the second battery are located on the same side of the first battery;

The second upper case and the second lower case of the second battery contain the second battery cell, the second circuit assembly and the first battery together.

8. The battery pack according to claim 6, wherein,

the first battery and the second circuit assembly of the second battery are arranged side by side in the length direction;

the second battery cell is located on one side of the first battery in the width direction;

9 . The battery pack according to claim 1 , wherein among the dimensions of the second battery in the length direction, the width direction and the thickness direction, the dimension in at least one direction is in a direction corresponding to the entire battery pack. 10 . are equal in size.

10. A device for using a battery pack, characterized in that the device comprises the battery pack according to any one of claims 1-9 and a battery compartment for accommodating the battery pack, the battery pack being the The device provides electrical energy.