Battery charging system

Abstract

The application provides a battery charging system. The battery charging system includes a battery compartment, an electrical assembly, and a rechargeable battery. The battery compartment has a battery slot. The battery slot is configured to selectively receive one of an AA battery and an AAA battery. The battery compartment includes a positive end wall. The positive end wall has a positive recess. The positive recess has a slot dimension in a second direction that is greater than 5 mm and less than 10 mm. The electrical assembly includes a positive portion. The positive portion is positioned within the positive recess. The rechargeable battery includes a battery positive terminal, an insulating ring, and a battery negative terminal. The insulating ring is connected between the battery negative terminal and the battery positive terminal. The insulating ring protrudes beyond an outer surface of the battery negative terminal in a length direction of the rechargeable battery. The application prevents damage to the battery from reverse charging.

Description

Technical Field

[0001] The present application generally relates to the technical field of battery charging, and more particularly to a battery charging system. Background Art

[0002] In recent years, rechargeable batteries have been widely used in various portable electrical and electronic devices, such as toys and handheld devices. This has placed increasing demands on the energy storage capacity of rechargeable batteries. In particular, lithium-ion rechargeable batteries are increasingly being used in these areas due to their high energy consumption, high-power discharge capability, and environmental friendliness.

[0003] The battery compartment of a battery charger in the related art does not have a reverse polarity protection function. That is, if the positive and negative poles of the battery are placed in the battery compartment with the battery reversed, the battery will be reversely charged when the power is turned on. This will damage the battery and affect its safe use.

[0004] Therefore, it is necessary to provide a battery charging system to at least partially solve the above problems. Summary of the Invention

[0005] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention of this application is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] To at least partially solve the above problems, the present application provides a battery charging system, comprising:

[0007] A battery compartment, the battery compartment defining a battery slot extending along a first direction, the battery slot being configured to selectively accommodate one of an AA-type battery and an AAA-type battery, the battery compartment including a positive terminal wall corresponding to an end of the battery slot, the positive terminal wall defining a positive electrode groove, the notch of the positive electrode groove facing the battery slot along the first direction, the notch of the positive electrode groove having a dimension greater than 5 mm and less than 10 mm along a second direction, the first direction being perpendicular to the second direction; and

[0008] an electrical component, the electrical component including a positive electrode portion, the positive electrode portion being located inside the positive electrode groove and not extending beyond a surface of the positive terminal wall facing the battery container along the first direction; and

[0009] The rechargeable battery comprises a battery positive pole, an insulating ring and a battery negative pole, the insulating ring is connected between the battery negative pole and the battery positive pole to separate the battery negative pole and the battery positive pole, the battery negative pole is located in the ring of the insulating ring, and the insulating ring protrudes from the outer surface of the battery negative pole in the length direction of the rechargeable battery, the insulating ring is used to contact the positive end wall when the battery negative pole faces the positive end wall, so as to prevent the battery negative pole from contacting the positive part, and the battery positive pole comprises a positive pole column used to contact the positive part.

[0010] According to the battery charging system, the positive end wall can block the negative pole of the battery, the positive recess on the positive end wall can allow the positive terminal of any one of the AA battery and the AAA battery to enter to contact the positive part, thereby preventing the battery from being damaged by reverse connection charging. Moreover, the insulating ring arranged on the battery contacts the positive end wall when the battery is reversely connected, which can further increase the distance between the negative pole and the positive part of the battery in the case of reverse connection of the battery, thereby more reliably preventing the battery from being reversely connected and powered on, and avoiding damage to the battery caused by power on.

[0011] Optionally, the battery cabin further comprises a first negative end wall;

[0012] The battery slot comprises a first slot part extending in the first direction, the first slot part is used to accommodate the AA battery, the first negative end wall is located at the end of the first slot part and is arranged opposite to the positive end wall, and the battery cabin is further provided with a first retreat slot;

[0013] The electrical assembly further comprises a first negative part, the first negative part is arranged corresponding to the first retreat slot, the first negative part is configured as a bent metal sheet capable of being elastically deformed, and the first negative part moves towards the bottom of the first retreat slot when subjected to an abutting force away from the positive end wall in the first direction.

[0014] Optionally, the battery cabin further comprises a second negative end wall;

[0015] The battery slot further comprises a second slot part extending in the first direction, the second slot part is used to accommodate the AAA battery, the first slot part and the second slot part coincide at the positive end wall, the second negative end wall is located at the end of the second slot part and is arranged opposite to the positive end wall, the first negative end wall and the second negative end wall are staggered with each other in a third direction, the third direction is consistent with the direction of the slot opening of the first slot part, and the second negative end wall is provided with a second retreat slot;

[0016] The electrical assembly further comprises a second negative pole part, which is arranged corresponding to the second retreat groove, and is configured as another elastic deformed bent metal sheet, and is configured to move towards the groove bottom of the second retreat groove when subjected to an abutting force along the first direction away from the positive pole end of the second groove part.

[0017] Optionally, the battery compartment has a top and a bottom opposite to each other along a third direction, the battery slot is located at the top of the battery compartment, and the third direction is parallel to the direction of the slot opening of the battery slot and perpendicular to the first direction and the second direction.

[0018] The size of the positive pole groove along the second direction increases in a direction parallel to the third direction and away from the slot opening of the battery slot.

[0019] Optionally, the positive pole part is configured as a conductive metal sheet, which comprises a first positive pole protrusion and a second positive pole protrusion extending in the first direction facing the battery slot, the first positive pole protrusion and the second positive pole protrusion are arranged in the third direction, and the second positive pole protrusion is closer to the bottom of the battery compartment than the first positive pole protrusion in the third direction, and the conductive metal sheet is configured such that:

[0020] The first positive pole protrusion contacts the positive pole of the AA type battery located in the battery slot, and the first positive pole protrusion and the second positive pole protrusion jointly contact the positive pole of the AAA type battery located in the battery slot.

[0021] Optionally, the first positive pole protrusion is closer to the center of the battery slot along the first direction than the second positive pole protrusion.

[0022] Optionally, the battery charging system further comprises a bottom cover connected to the bottom of the battery compartment, and a containing cavity is formed between the bottom cover and the battery compartment.

[0023] The electrical assembly further comprises a circuit board located in the containing cavity, and the positive pole part, the first negative pole part and the second negative pole part are electrically connected to the circuit board.

[0024] Optionally, the electrical assembly further comprises an interface member connected to the circuit board, and the interface member is configured to be connected to an external power supply.

[0025] Optionally, the electrical assembly further comprises a charging indicator light connected to the circuit board.

[0026] The battery charging system further comprises a surface cover openably connected to the top of the battery compartment, wherein

[0027] The face cover is configured as a structure capable of transmitting light; or

[0028] The face cover comprises a first window portion capable of transmitting light, which is arranged correspondingly to the charging indicator light.

[0029] Optionally, the second negative portion is further away from the top of the battery compartment than the first negative portion in the third direction.

[0030] Optionally, the battery compartment comprises a first stop portion for constituting a groove bottom of the first yielding groove, which is used to prevent the first negative spring from moving in the first direction away from the battery groove.

[0031] Optionally, the first negative spring comprises a first support segment and a first bending segment, the first support segment is arranged in extension in the third direction, which is generally parallel to the depth direction of the battery groove, one end of the first support segment is fixedly arranged relative to the battery compartment, the other end of the first support segment is connected to one end of the first bending segment, the first bending segment is located on the side of the first support segment away from the first stop portion, the center of curvature of the first bending segment is located on the side of the first bending segment facing the first stop portion, and the first bending segment is used to abut against the negative electrode of the AA battery.

[0032] Optionally, the first support segment and the stop surface are arranged in interval in the first direction; and / or

[0033] The other end of the first bending segment is arranged in interval with the first support segment in the first direction; and / or

[0034] The surface of the first bending segment away from the first support segment is formed with a first negative protrusion, which is used to contact the negative electrode of the AA battery.

[0035] Optionally, the battery charging system further comprises a first light guide member, which is configured as a transparent or translucent structure, is arranged correspondingly to the negative electrode end of the battery groove, comprises a first light guide surface and a second light guide surface, the first light guide surface faces the inside of the battery groove in the first direction, the direction of the second light guide surface is the same as that of the opening of the battery groove, and the first light guide member is used to transmit the light emitted from the negative electrode end of the rechargeable battery.

[0036] The first yielding groove is opened in the first light guide member.

[0037] Optionally, the battery charging system further comprises a charging indicator light and a second light guide, the charging indicator light is connected to the circuit board, the battery compartment comprises a first window portion arranged corresponding to the position of the charging indicator light, the first window portion is located at the part of the battery compartment away from the bottom cover along a third direction, the second light guide is connected between the first window portion and the charging indicator light, and the first window portion and the second light guide are configured as light-transmissive structures.

[0038] Optionally, the second negative electrode portion is a second negative electrode spring, and the second negative electrode spring comprises a second bending segment and a third bending segment connected in sequence, a curvature center of the second bending segment is located at one side of the second bending segment facing the positive electrode end of the second slot portion, and a curvature center of the third bending segment is located at one side of the third bending segment away from the positive electrode end of the second slot portion.

[0039] Optionally, the second bending segment and the third bending segment substantially form an S-shaped bending structure, and a bending portion of the third bending segment is closer to the positive electrode end of the second slot portion than the remaining part of the third bending segment and the second bending segment, so as to contact the negative electrode of the AAA-type battery located in the second slot portion.

[0040] Optionally, the battery charging system further comprises a circuit board, the second negative electrode spring is connected to the circuit board, the circuit board and / or the battery compartment is provided with a relief hole, the second bending segment is movably arranged in the relief hole, a size of the relief hole along the first direction is greater than a size of the second bending segment along the first direction, and the size of the relief hole along the first direction is smaller than the sum of the sizes of the second bending segment and the third bending segment along the first direction.

[0041] Optionally, the second bending segment is spaced apart from a hole wall of the relief hole away from the positive electrode end of the second slot portion along the first direction. BRIEF DESCRIPTION OF DRAWINGS

[0042] The following drawings for the embodiments of the present application are hereby incorporated into this application as part of the present application for understanding the present application. The embodiments of the present application and the description thereof shown in the drawings are used to explain the principles of the present application. In the drawings,

[0043] FIG. 1 It is an exploded perspective view of a battery charger according to a preferred embodiment of the present application, wherein a battery compartment is provided with a AAA-type battery and an AA-type battery respectively;

[0044] FIG. 2 It is a top view of the battery compartment of the battery charger shown in FIG. 1 ​

[0045] FIG. 3 a sectional view taken along line A-A in FIG. 2

[0046] FIG. 4 a top view of the battery compartment shown in FIG. 2

[0047] FIG. 5 a sectional view taken along line B-B in FIG. 4

[0048] FIG. 6 an enlarged schematic view of I in FIG. 5

[0049] FIG. 7 a schematic view of the battery compartment shown in FIG. 2

[0050] FIG. 8 a sectional view taken along line C-C in FIG. 7

[0051] FIG. 9 an enlarged schematic view of II in FIG. 8

[0052] FIG. 10 a schematic view of the structure of a rechargeable battery according to a specific embodiment of the present application;

[0053] FIG. 11 FIG. 1 a partial enlarged schematic view of the position of the positive terminal wall in the battery charger shown in

[0054] FIG. 12 FIG. 1 a partial enlarged schematic view of the position of the positive terminal in the battery charger shown in

[0055] FIG. 13 FIG. 1 a partial enlarged schematic view of the position of the negative terminal in the battery charger shown in

[0056] FIG. 14 FIG. 1 a sectional schematic view of the position of the negative terminal in the battery charger shown in

[0057] FIG. 15 FIG. 1 a perspective view of the battery compartment in the battery charger shown in

[0058] FIG. 16 FIG. 1 another perspective view of the battery compartment in the battery charger shown in​​​​​​​​​​​​​

[0059] FIG. 17 Fig. 1 shows a perspective view of a battery charger according to an embodiment of the present application. FIG. 1

[0060] FIG. 18 Fig. 2 shows a perspective view of a first light guide according to an embodiment of the present application. FIG. 1

[0061] BRIEF DESCRIPTION OF DRAWINGS

[0062] 1: AA battery 1a: positive pole

[0063] 1b: negative plate 1c: insulating ring

[0064] 2: AAA battery 101: battery compartment

[0065] 101a: first slot portion 101b: second slot portion

[0066] 101c: positive end wall 101d: positive recess

[0067] 101e: second negative end wall 101f: second retreat slot

[0068] 101k: second window portion 101m: taking and placing slot

[0069] 101p: second stop portion 101q: first via hole

[0070] 101r: second via hole 102: face cover

[0071] 102a: first window portion 103: bottom cover

[0072] 104: first light guide 104a: first light guide surface

[0073] 104b: second light guide surface 104c: first retreat slot

[0074] 104e: first stop portion 104f: first negative end wall

[0075] 105: accommodating cavity 110: electrical component

[0076] 112: positive portion 112a: first positive protrusion

[0077] 112b: second positive protrusion 113: first negative portion

[0078] 113a: first connecting segment 113b: first supporting segment

[0079] ​​113c: first bent section 113d: first negative electrode protrusion

[0080] 115: second negative electrode portion 115a: second connecting section

[0081] 115b: second bent section 115c: third bent section

[0082] 120: interface member 150: charge indicator light

[0083] 170: circuit board 170a: avoidance hole

[0084] 180: second light guide member D1: first direction

[0085] D2: second direction D3: third direction DETAILED DESCRIPTION

[0086] In the following description, numerous specific details are set forth to provide a more thorough understanding of the present application. However, it will be apparent to one of skill in the art that the present application can be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present application.

[0087] To thoroughly understand the present application, a detailed description of specific structure will be presented in the following description. It is apparent that the implementation of the present application is not limited to the special details as familiar to those skilled in the art.

[0088] It is to be understood that the terms used herein are merely for the purpose of describing specific embodiments and are not intended to limit the present application, and the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. When the terms "comprise" and / or "include" are used in the specification, it is indicated that there is existence of the described features, integers, steps, operations, elements, and / or components, but not excluding the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or a combination thereof.

[0089] The ordinal numbers such as "first" and "second" used in the present application are merely for the purpose of identification and do not have any other meaning, such as a specific order, etc. Also, for example, the term "first member" itself does not imply the existence of "second member", and the term "second member" itself does not imply the existence of "first member". It is to be noted that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and similar expressions used in the present application are for illustrative purposes only and are not limiting.

[0090] Hereinafter, the specific embodiments of the present application will be described in more detail with reference to the accompanying drawings, which show representative embodiments of the present application and are not limiting of the present application.

[0091] The present application provides a battery charging system. As shown in FIGS. 1-18 The battery charging system according to the present application can include a battery compartment 101, an electrical assembly 110, and rechargeable batteries 1, 2. The battery compartment 101 is provided with a battery slot extending along a first direction D1. The battery slot is configured to selectively receive one of an AA battery 1 and a AAA battery 2. The battery compartment 101 can include a positive end wall 101c corresponding to an end of the battery slot. The positive end wall 101c is provided with a positive recess 101d. The opening of the positive recess 101d faces the battery slot along the first direction D1. The dimension of the opening of the positive recess 101d along a second direction D2 is greater than 5mm and less than 10mm. The first direction D1 is perpendicular to the second direction D2. The electrical assembly 110 can include a positive portion 112. The positive portion 112 is located inside the positive recess 101d. And the positive portion 112 does not protrude beyond the surface of the positive end wall 101c facing the battery slot along the first direction D1. Typically, the diameter of the positive terminal of the AA battery 1 is up to 5.5mm, and the outer diameter of the AAA battery 2 is up to 9.5mm. By limiting the dimension of the positive recess 101d along the second direction D2, the positive terminal of the AA battery 1 and the AAA battery 2 is allowed to enter the positive recess 101d to connect with the positive portion 112, while the negative terminal of the AAA battery 2 and the AA battery 1 is prevented from entering the positive recess 101d, thereby preventing the battery from being connected reversely. The rechargeable battery can include a battery positive terminal, an insulating ring 1c, and a battery negative terminal. The insulating ring 1c is connected between the battery negative terminal and the battery positive terminal to separate the battery negative terminal and the battery positive terminal. The battery negative terminal is located inside the ring of the insulating ring 1c. And the insulating ring 1c protrudes beyond the outer surface of the battery negative terminal along the length direction of the rechargeable battery. The insulating ring 1c is configured to contact the positive end wall 101c when the battery negative terminal faces the positive end wall 101c, so as to prevent the battery negative terminal from contacting the positive portion 112.

[0092] According to the battery charging system of the present application, the positive end wall can block the negative terminal of the battery, and the positive recess on the positive end wall can allow the positive terminal of either of the AA battery and the AAA battery to enter to contact the positive portion, thereby preventing the battery from being connected reversely and damaged. Moreover, the insulating ring provided on the battery contacts the positive end wall when connected reversely, which can further increase the distance between the negative terminal and the positive portion of the battery in the case of reverse connection, thereby more reliably preventing the battery from being connected reversely and powered, and avoiding damage to the battery caused by power supply.

[0093] In some embodiments, FIG. 10As shown in the AA battery 1, the positive electrode of the battery can include a positive electrode post 1a for contacting the positive electrode portion 112, and the negative electrode of the battery can include a negative electrode tab.

[0094] Referring to FIG. 3 , FIG. 5 , FIG. 6 , FIG. 8 , FIG. 9 , FIG. 14 , FIG. 16 and FIG. 18 In addition, the battery compartment 101 can further include a first negative electrode end wall 104f. The battery slot can include a first slot portion 101a extending along the first direction D1. The first slot portion 101a is adapted to accommodate the AA battery 1. The first negative electrode end wall 104f is located at an end of the first slot portion 101a and is arranged opposite to the positive electrode end wall 101c. That is, the first negative electrode end wall 104f faces the positive electrode end wall 101c along the first direction D1. The battery compartment 101 further includes a first retreat slot 104c. The first retreat slot 104c is formed in the first negative electrode end wall 104f. The electrical assembly 110 can further include a first negative electrode portion 113. The first negative electrode portion 113 is arranged corresponding to the first retreat slot 104c. The first negative electrode portion 113 at least partially protrudes from the first negative electrode end wall 104f, so as to be adapted to abut against the negative electrode of the battery. The first negative electrode portion 113 is configured as a bent metal sheet capable of elastic deformation. When the first negative electrode portion 113 is subjected to an abutting force away from the positive electrode end wall 101c along the first direction D1, the first negative electrode portion 113 moves towards the slot bottom of the first retreat slot 104c. By providing the first negative electrode end wall 104f, the limit position of the negative electrode of the battery in the first slot portion 101a can be limited. By providing the first retreat slot 104c in the first negative electrode end wall 104f for the deformation space required by the first negative electrode portion 113 when subjected to the abutting force of the battery, the first negative electrode portion 113 can reliably abut against the negative electrode of the battery.

[0095] Referring to FIGS. 2-9 , FIG. 14 and FIG. 16 For example, the minimum distance between the positive electrode portion 112 and the first negative electrode portion 113 along the first direction D1 is less than the length of the AA battery 1. In the case of elastic deformation of the first negative electrode portion 113, the abutting force between the negative electrode terminal of the battery and the first negative electrode portion 113 can be ensured, so as to make the conductive connection between the negative electrode terminal of the battery and the first negative electrode portion 113 more reliable, and to a certain extent, prevent the battery from being separated from the first negative electrode portion 113.

[0096] Referring to FIG. 3 , FIG. 5 , FIG. 6 , FIG. 8 , FIG. 9 , FIG. 14 , FIG. 16 and FIG. 18In addition, the battery compartment 101 can further comprise a second negative end wall 101e. The battery slot can further comprise a second slot portion 101b extending along the first direction D1. The second slot portion 101b is adapted to accommodate a AAA battery 2. The first slot portion 101a and the second slot portion 101b coincide at the positive end wall 101c. That is, the first slot portion 101a and the second slot portion 101b share the positive end wall 101c. The second negative end wall 101e is located at the end of the second slot portion 101b and is arranged opposite to the positive end wall 101c. The first negative end wall 104f and the second negative end wall 101e are staggered with each other in the third direction D3. The third direction D3 is consistent with the orientation of the slot opening of the first slot portion 101a, such as parallel to each other or having a small included angle, for example, 5°. The second negative end wall 101e is provided with a second retreat slot 101f. The electrical component 110 can further comprise a second negative portion 115. The second negative portion 115 is provided corresponding to the second retreat slot 101f. And the second negative portion 115 protrudes from the second negative end wall 101e. The second negative portion 115 is configured as another elastic deformed bent metal sheet. When the second negative portion 115 is subjected to an abutting force away from the positive end of the second slot portion 101b along the first direction D1, the second negative portion 115 moves towards the bottom of the second retreat slot 101f. By providing the first slot portion 101a and the second slot portion 101b in the same battery slot, and the first slot portion 101a and the second slot portion 101b share the positive end wall 101c, and the first negative end wall 104f of the first slot portion 101a and the second negative end wall 101e of the second slot portion 101b are staggered with each other in the third direction D3. In this way, the space along the third direction D3 of the battery compartment 101 is fully utilized, the compactness of the structure of the battery compartment 101 along the third direction D3 is improved, and the space occupation of the first slot portion 101a and the second slot portion 101b in the second direction D2 is reduced, thereby facilitating and reducing the size of the battery compartment 101 along the second direction D2. The first slot portion 101a and the second slot portion 101b in the same position are used at different times. For example, when the first slot portion 101a is used, the second slot portion 101b cannot be used, and the second slot portion 101b can be used only after the battery in the first slot portion 101a is removed.

[0097] Referring to FIGS. 2-9 , FIG. 14 and FIG. 16 For example, the minimum distance between the positive portion 112 and the second negative portion 115 along the first direction D1 is less than the length of the AAA battery 2. In the case of elastic deformation of the second negative portion 115, the force between the negative terminal of the battery and the second negative portion 115 can be generated, thereby ensuring more reliable electrical connection between the negative terminal of the battery and the second negative portion 115, and to some extent preventing the battery from being separated from the second negative portion 115.

[0098] Referring to FIGS. 1-9 , andFIGS. 14-16 For example, the battery compartment 101 has a top portion and a bottom portion opposite to each other in the third direction D3. The battery slot is located at the top portion of the battery compartment 101. The third direction D3 is parallel to the orientation of the slot of the battery slot and perpendicular to the first direction D1 and the second direction D2. The dimension of the positive terminal recess 101d in the second direction D2 increases in a direction parallel to the third direction D3 and away from the slot of the battery slot. In this way, it is easier to assemble the positive terminal of the battery into the positive terminal recess 101d, and the upward movement of the positive terminal of the battery can be guided by the configuration of the positive terminal recess 101d with the upper portion smaller than the lower portion. When the battery is fully located in the battery slot, the positive terminal of the battery can be limited by the opposite side walls of the positive terminal recess 101d in the second direction D2 to prevent the positive terminal of the battery from moving in the second direction D2. In this way, the battery can also be prevented from moving out of the battery slot in the third direction D3 during charging, which affects the charging effect.

[0099] Referring to FIG. 3 , FIG. 5 , FIG. 6 , FIG. 8 , FIG. 9 , FIG. 14 and FIG. 16 Further, the positive terminal recess 101d penetrates the bottom portion of the battery compartment 101 in the third direction D3 to allow the positive terminal portion 112 to move into and out of the positive terminal recess 101d, thereby facilitating the installation and maintenance of the positive terminal portion 112 and also facilitating the installation of the battery.

[0100] Referring to FIG. 3 , FIG. 5 , FIG. 8 , FIG. 12 and FIG. 15 For example, the positive terminal portion 112 is configured as a conductive metal sheet. The conductive metal sheet can include a first positive protrusion 112a and a second positive protrusion 112b extending in the first direction D1 facing the battery slot. The first positive protrusion 112a and the second positive protrusion 112b are spaced apart in the third direction D3. And the second positive protrusion 112b is closer to the bottom portion of the battery compartment 101 in the third direction D3 than the first positive protrusion 112a. The conductive metal sheet is configured such that:

[0101] The first positive protrusion 112a contacts the positive terminal of the AA-type battery 2 located in the battery slot, and the first positive protrusion 112a and the second positive protrusion 112b collectively contact the positive terminal of the AAA-type battery 2 located in the battery slot.

[0102] The present application can be used to selectively accommodate AA battery 1 or AAA battery 2 by setting battery slot in the battery compartment, and by setting positive pole part 112 at the end of the battery slot, the positive pole part 112 can be used to connect the positive pole of the battery. When AA battery 1 is located in the battery slot, the positive pole of AA battery 1 abuts against first positive pole protrusion 112a of positive pole part 112; when AAA battery 2 is located in the battery slot, the positive pole of AAA battery 2 abuts against first positive pole protrusion 112a and second positive pole protrusion 112b. In this way, when AA battery 1 and AAA battery 2 are respectively placed in the battery slot, the positive pole part 112 can be shared, thereby helping to simplify the structure of the battery charger, facilitating production and manufacturing, and also being conducive to the miniaturization of the battery charger. When first positive pole protrusion 112a and second positive pole protrusion 112b of positive pole part 112 abut against the battery, the battery can be applied with elastic force by using the elastic deformation of the conductive metal sheet, so that the conductive metal sheet can be in reliable conductive contact with the battery.

[0103] With reference to FIG. 3 , FIG. 5 , FIG. 8 , FIG. 12 and FIG. 15 , for example, first positive pole protrusion 112a is closer to the center of the battery slot in the first direction D1 than second positive pole protrusion 112b. Therefore, first positive pole protrusion 112a can apply a certain force to the positive terminal of AA battery 1 when AA battery 1 is installed, avoiding falling off, and at the same time, cooperating with second positive pole protrusion 112b, it can limit the positive terminal of AAA battery 2 when AAA battery 2 is installed, better fixing AAA battery 2.

[0104] With reference to FIGS. 1-9 , and FIGS. 11-16 In addition, the battery charging system can also include bottom cover 103. Bottom cover 103 is connected to the bottom of battery compartment 101. Bottom cover 103 and battery compartment 101 form containing cavity 105. Electrical assembly 110 also includes circuit board 170. Circuit board 170 is located in containing cavity 105. Positive pole part 112, first negative pole part 113 and second negative pole part 115 are electrically connected to circuit board 170. In the specific assembly, first, electrical assembly 110 is installed from the bottom of battery compartment 101 to battery compartment 101, and then bottom cover 103 is installed, thereby forming containing and supporting for electrical assembly 110.

[0105] With reference to FIG. 1In addition, the electrical assembly 110 can further include an interface member 120, which is usually arranged on one side of the electrical assembly 110. A gap can be arranged between the battery compartment 101 and the bottom cover 103 for the interface member 120 to pass through, so as to facilitate the connection of the interface member 120 with a corresponding connector. The interface member 120 is arranged as a USB interface or a Type-C interface, for example. The interface member 120 is connected to the circuit board 170. The interface member 120 can be used to be connected to an external power supply, so as to supply power to the circuit board 170 in the battery compartment 101, thereby realizing the charging of the battery.

[0106] Referring to FIG. 1 , FIG. 2 , FIG. 4 , FIG. 7 , FIG. 15 and FIG. 16 In addition, the electrical assembly 110 can further include a charging indicator light 150. The charging indicator light 150 is connected to the circuit board 170. The circuit board 170 is used to realize the power supply and control of the charging indicator light 150. The charging indicator light 150 can indicate the charging state, thereby facilitating the use of the user. The battery charger can further include a face cover 102, which is openably connected to the top of the battery compartment 101. When the face cover 102 is opened, the battery can be conveniently installed or dismounted. When the face cover 102 is closed, the battery can be protected (for example, dustproof, waterproof, anti-collision, and anti-battery separation effects).

[0107] In one example, the face cover 102 can be configured as a light-transmissive structure, such as a transparent plastic plate, so as to facilitate the user to observe the state of the charging indicator light 150.

[0108] Continuing to refer to FIG. 1 , FIG. 2 , FIG. 4 , FIG. 7 , FIG. 15 and FIG. 16 In another example, a first window portion 102a capable of transmitting light is arranged on the face cover 102. The first window portion 102a is arranged correspondingly to the charging indicator light 150. FIG. 2 and FIG. 14 As shown, a second window portion 101k capable of transmitting light is also arranged correspondingly to the charging indicator light 150 on the battery compartment 101. The first window portion 102a and the second window portion 101k cooperate to facilitate the user to observe the charging indicator light 150.

[0109] Referring to FIGS. 1-9 , and FIGS. 11-16For example, the second negative electrode portion 115 is further away from the top of the battery compartment 101 than the first negative electrode portion 113 in the third direction D3. In this way, the first negative electrode portion 113 can abut against the negative electrode of another battery, such as the AA battery 1, located in the first slot portion 101a, and the second negative electrode portion 115 can abut against the negative electrode of another battery, such as the AAA battery 2, located in the second slot portion 101b. The second negative electrode portion 115 is further away from the top of the battery compartment 101 than the first negative electrode portion 113 in the third direction D3, which is parallel to the direction of the slot opening of the battery slot and perpendicular to the first direction D1 and the second direction D2, the first negative electrode portion 113 is configured to abut against the negative electrode of the AA battery 1, and the second negative electrode portion 115 is configured to abut against the negative electrode of the AAA battery 2, thereby enhancing the practicability and adaptability of the battery charger.

[0110] Referring to FIGS. 1-9 , and FIGS. 13-16 For example, the first negative electrode portion 113 can be configured as a first negative electrode spring. The second negative electrode portion 115 can be configured as a second negative electrode spring. The battery compartment 101 can include a first stop portion 104e configured to form a bottom of the first retreat slot 104c. The first stop portion 104e is configured to prevent the first negative electrode spring from continuing to move in the first direction D1 away from the battery slot. By providing the first stop portion 104e, the limit position of the first negative electrode spring in the first direction D1 is limited, so as to prevent the first negative electrode spring from being difficult to reset normally due to excessive deformation, thereby facilitating the prolongation of the service life of the first negative electrode spring.

[0111] Referring to FIG. 3 , FIG. 5 , FIG. 6 , FIG. 8 , FIG. 9 , FIG. 13 , FIG. 14 , and FIG. 16 Further, the first negative electrode spring can include a first support segment 113b and a first bending segment 113c. The first support segment 113b is configured to extend in the third direction D3. The third direction D3 is generally parallel to the depth direction of the battery slot. One end of the first support segment 113b is fixedly arranged relative to the battery compartment 101. The other end of the first support segment 113b is connected to one end of the first bending segment 113c. The first bending segment 113c is located on the side of the first support segment 113b away from the first stop portion 104e. The center of curvature of the first bending segment 113c is located on the side of the first bending segment 113c facing the first stop portion 104e. The first bending segment 113c is configured to abut against the negative electrode of the AA battery 2. Here, the first support segment 113b serves as a support structure of the first negative electrode spring to support the first bending segment 113c. The first bending segment 113c can increase the elastic deformation amount of the first negative electrode spring, thereby being able to provide a greater elastic force and also helping to reduce the probability of failure of the first negative electrode spring.

[0112] For example, the first supporting section 113b is arranged along the first direction D1 apart from the stop surface. In this way, the first supporting section 113b also has a corresponding deformation space. The other end of the first bending section 113c is arranged along the first direction D1 apart from the first supporting section 113b. In this way, the maximum deformation amount of the first bending section 113c is further increased. The surface of the first bending section 113c away from the first supporting section 113b is formed with a first negative electrode protrusion 113d. The first negative electrode protrusion 113d is used to contact the negative electrode of the AA battery 1. By arranging the first negative electrode protrusion 113d, the elastic force between the first negative electrode spring and the battery can be increased, so that the connection between the first negative electrode spring and the battery is more reliable, thereby being beneficial to preventing the conductive failure.

[0113] Continuing to refer to FIG. 3 , FIG. 5 , FIG. 6 , FIG. 8 , FIG. 9 , FIG. 13 , FIG. 14 and FIG. 16 Optionally, the first negative electrode spring can further include a first connecting section 113a. The first connecting section 113a is connected to the end of the first supporting section 113b away from the first bending section 113c. The first connecting section 113a is used to be fixedly connected to the circuit board 170.

[0114] In the examples shown in FIG. 1 and FIG. 13 , the first connecting section 113a and the first supporting section 113b form an L-shaped structure.

[0115] Referring to FIGS. 1-9 , and FIGS. 14-18In addition, the battery charging system can further comprise a first light guide 104. The first light guide 104 is configured as a transparent or translucent structure. The first light guide 104 is arranged corresponding to the negative terminal of the battery slot. The first light guide 104 can comprise a first light guide surface 104a and a second light guide surface 104b. The first light guide surface 104a faces the slot of the battery slot in the first direction D1. The second light guide surface 104b faces the same direction as the slot opening of the battery slot. The first light guide 104 is used to transmit the light emitted by the negative terminal of the rechargeable battery. The first light guide 104 is provided with a first retreat groove 104c. By providing the first light guide 104, the battery whose negative terminal can emit light in the charging state can be applied. When the battery is located in the battery slot and correctly installed, the negative terminal of the battery in the charging state emits light, which is transmitted to the inside of the first light guide 104 through the first light guide surface 104a, and then transmitted outward along the third direction D3 through the second light guide surface. By providing the first light guide 104, the light guide area is increased, so that the user can intuitively know the state of the battery through the second light guide surface 104b,

[0116] Referring to FIG. 1 , FIG. 2 , FIG. 4 , FIG. 7 , FIG. 15 and FIG. 16 In addition, the battery charger can further comprise a charging indicator light 150 and a second light guide 180. The charging indicator light 150 is connected to the circuit board 170. The battery compartment 101 comprises a first window portion 102a arranged corresponding to the position of the charging indicator light 150. The first window portion 102a is located at the position of the battery compartment 101 away from the bottom cover 103 in the third direction D3. The second light guide 180 is connected between the first window portion 102a and the charging indicator light 150. The first window portion 102a and the second light guide 180 are both configured as light-transmitting structures. When the battery is in the charging state, the charging indicator light 150 can transmit light to the first window portion 102a through the second light guide 180, so that the user can intuitively observe the charging state of the battery through the first window portion 102a outside the battery compartment 101, so as to timely take out the battery or disconnect the battery compartment 101 from the external power supply when the battery reaches the full charge state.

[0117] Referring to FIG. 1 For example, the second light guide 180 can be configured as a light guide column. The light guide column is made of transparent or translucent material.

[0118] Referring to FIG. 3 , FIG. 5 , FIG. 6 , FIG. 8 , FIG. 9 , FIG. 13 , FIG. 14 andFIG. 16 For example, the second negative spring can include a second bending section 115b and a third bending section 115c connected in sequence. The center of curvature of the second bending section 115b is located on the side of the second bending section 115b facing the positive electrode end of the second slot 101b. The center of curvature of the third bending section 115c is located on the side of the third bending section 115c facing away from the positive electrode end of the second slot 101b. By providing the structure of the second bending section 115b and the third bending section 115c bending in different directions respectively, the deformation amount and the rigidity of the elastic deformation of the second negative spring can be enhanced, so that the elastic force applied by the second negative spring to the battery can be effectively improved, and the connection between the two can be more reliable to prevent the failure of conduction caused by poor contact.

[0119] Referring back to FIG. 3 , FIG. 5 , FIG. 6 , FIG. 8 , FIG. 9 , FIG. 13 , FIG. 14 and FIG. 16 Further, the second bending section 115b and the third bending section 115c generally constitute an S-shaped bending structure. The bending of the third bending section 115c is closer to the positive electrode end of the second slot 101b than the rest of the third bending section 115c and the second bending section 115b, so as to contact the negative electrode of the AAA battery 2 located in the second slot 101b. In this way, the stability and reliability of the connection between the second negative spring and the battery located in the second slot 101b can be further improved.

[0120] Referring back to FIG. 3 , FIG. 5 , FIG. 6 , FIG. 8 , FIG. 9 , FIG. 13 , FIG. 14 and FIG. 16 Still further, the second negative spring can further include a second connecting section 115a. The second connecting section 115a is connected to the end of the second bending section 115b away from the third bending section 115c and is connected to the circuit board 170. The second connecting section 115a can increase the stability of the connection structure between the second negative spring and the circuit board 170.

[0121] In order to further increase the force of the second negative spring on the battery located in the second slot 101b, a second negative protrusion (not shown) can also be provided on the surface of the third bending section 115c for contacting the battery.

[0122] Referring back to FIG. 1 , FIG. 3 , FIG. 5 , FIG. 6 , FIG. 8 ,FIG. 14 、 FIG. 16 and FIG. 17 For example, the second negative spring piece is connected to the circuit board 170. The circuit board 170 and / or the battery compartment 101 is provided with a relief hole 170a. The second bending section 115b is movably arranged in the relief hole 170a. The size of the relief hole 170a along the first direction D1 is greater than the size of the second bending section 115b along the first direction D1. In this way, the second bending section 115b of the second negative spring piece can move into the relief hole 170a adaptively during the elastic deformation, so that the corresponding elastic restoring force can be stored, and meanwhile, the second bending section 115b can be prevented from being excessively pressed and difficult to recover. The size of the relief hole 170a along the first direction D1 is less than the sum of the sizes of the second bending section 115b and the third bending section 115c along the first direction D1. In this way, the limit position of the second negative spring piece during the elastic deformation can be limited, so that the second negative spring piece can be prevented from being excessively deformed and difficult to recover. The second bending section 115b is spaced apart from the hole wall of the relief hole 170a away from the positive end of the second slot portion 101b along the first direction D1. In this way, a space for the movement of the second bending section 115b is formed between the second bending section 115b and the hole wall of the relief hole 170a, and the deformable space of the second negative spring piece is further increased.

[0123] In FIG. 1 、 FIG. 3 、 FIG. 5 、 FIG. 6 、 FIG. 8 、 FIG. 14 、 FIG. 16 and FIG. 17 In the example shown, the relief hole 170a is arranged on the circuit board 170.

[0124] Referring to FIGS. 1-9 、 FIG. 13 、 FIG. 14 、 FIG. 16 and FIG. 17In addition, the battery charger can further include a bottom cover 103. The bottom cover 103 is connected to the battery compartment 101. The bottom cover 103 and the battery compartment 101 form a receiving cavity 105 therebetween. The circuit board 170 is located in the receiving cavity 105. The battery compartment 101 is provided with a first through hole 101q and a second through hole 101r. The first through hole 101q penetrates the battery compartment 101 from the first groove portion 101a towards the bottom cover 103. The first through hole 101q is adapted to pass through the first negative portion 113. The second through hole 101r penetrates the portion of the battery compartment 101 towards the bottom cover 103 along the third direction D3 and penetrates the second negative end wall 101e along the first direction D1. The second through hole 101r is in communication with the receiving cavity 105 and is arranged in correspondence with the avoiding hole 170a along the third direction D3. A second stop portion 101p is formed between the first through hole 101q and the second through hole 101r. The second stop portion 101p separates the first through hole 101q and the second through hole 101r. The surface of the second stop portion 101p facing the second groove portion 101b constitutes a part of the second negative end wall 101e. The second negative spring piece extends from the receiving cavity 105 through the second through hole 101r and into the second groove portion 101b. The second bending section 115b is at least partially located in the receiving cavity 105. The third bending section 115c is at least partially located in the second groove portion 101b. The above-mentioned second stop portion 101p can limit the limit position of the third bending section 115c during deformation, so as to prevent the third bending section 115c from being deformed too much and being difficult to recover. In this way, it not only helps to reasonably arrange the circuit board 170 and the electrical components 110 such as the positive portion 112, the first negative portion 113 and the second negative portion 115, but also facilitates assembly.

[0125] Referring to FIG. 1 , FIG. 3 , FIG. 5 , FIG. 6 , FIG. 8 and FIG. 9 Further, the first negative portion 113 and the second negative portion 115 share one circuit board 170. The positive portion 112 is arranged on another circuit board 170. In this way, it is convenient to assemble respectively, improves the flexibility of assembly, and is also convenient for maintenance and replacement.

[0126] Of course, in other embodiments, the positive portion 112, the first negative portion 113 and the second negative portion 115 can all be integrated on the same circuit board.

[0127] Referring to FIG. 1 , FIG. 2 , FIG. 4 , FIG. 7 , FIG. 15 and FIG. 16The top of the two ends of the battery compartment 101 along the second direction D2 is provided with a taking and placing groove 101m. The taking and placing groove 101m is located at the end of the battery compartment 101 along the second direction D2 and is communicated to the battery groove along the second direction D2. In the plane perpendicular to the second direction D2, the projection of the taking and placing groove 101m coincides with the first groove part 101a and the second groove part 101b. The direction of the slot of the taking and placing groove 101m is the same as that of the first groove part 101a. By providing the taking and placing groove 101m, the user can conveniently take out the battery located in the first groove part 101a or the second groove part 101b.

[0128] Referring to FIG. 10 Taking the AA battery 1 as an example, the battery comprises a positive pole 1a, a negative pole 1b and an insulating ring 1c, the insulating ring 1c is connected between the negative pole of the battery and the positive pole of the battery to disconnect the negative pole of the battery and the positive pole of the battery, the negative pole of the battery is located in the ring of the insulating ring 1c, and the insulating ring 1c protrudes from the outer surface of the negative pole of the battery in the length direction of the rechargeable battery. The insulating ring 1c is used to contact the positive end wall 101c when the negative pole of the battery faces the positive end wall 101c, so as to prevent the negative pole of the battery from contacting the positive pole part 112. The positive pole of the battery comprises the positive pole 1a for contacting the positive pole part 112, the negative pole of the battery comprises the negative pole 1b for contacting the first negative pole part 113 and the second negative pole part 115, and the insulating ring 1c provided on the battery contacts the positive end wall 101c when the battery is reversely connected, thereby avoiding damage to the battery caused by power supply. The rechargeable battery and the battery charger provided by the application jointly act to avoid damage to the battery after the battery is reversely installed and powered on, and the battery charger and the rechargeable battery jointly constitute a more stable and safe battery charging system.

[0129] Unless otherwise defined, 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 herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used herein, the term "set" can mean either a component is directly attached to another component or a component is attached to another component via an intermediate component. The features described in one embodiment can be applied to another embodiment, either alone or in combination with other features, unless the features are not applicable or are otherwise stated.

[0130] The application has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and illustration, and are not intended to limit the application to the described embodiments. Those skilled in the art can understand that more variations and modifications can be made according to the teachings of the application, and these variations and modifications all fall within the scope of the application claimed.

Claims

1. A battery charging system, characterized by, The battery charging system comprises: a battery compartment having a battery slot extending along a first direction, the battery slot being configured to selectively receive one of an AA battery and an AAA battery, the battery compartment comprising a positive end wall corresponding to an end of the battery slot, the positive end wall having a positive recess formed therein, the positive recess having a slot opening facing the battery slot along the first direction, the positive recess having a dimension along a second direction greater than 5mm and less than 10mm, the first direction being perpendicular to the second direction; an electrical assembly comprising a positive portion, the positive portion being positioned within the positive recess and not protruding beyond a surface of the positive end wall facing the battery slot along the first direction; and a rechargeable battery comprising a battery positive, an insulating ring connected between the battery negative and the battery positive to separate the battery negative and the battery positive, the battery negative being positioned within a ring of the insulating ring and the insulating ring protruding beyond an outer surface of the battery negative along a length direction of the rechargeable battery, the insulating ring being configured to contact the positive end wall when the battery negative faces the positive end wall to prevent the battery negative from contacting the positive portion, the battery positive comprising a positive post configured to contact the positive portion, wherein the battery compartment has a top portion and a bottom portion opposite along a third direction, the battery slot being positioned at the top portion of the battery compartment, the third direction being parallel to a facing direction of the slot opening of the battery slot and perpendicular to the first direction and the second direction, the dimension of the positive recess along the second direction increasing in a direction parallel to the third direction and away from the slot opening of the battery slot; and wherein the battery compartment further comprises a negative end wall positioned at an end of the battery slot and arranged opposite to the positive end wall, the negative end wall having a retreat slot formed therein, the electrical assembly further comprising a negative portion configured to be positioned corresponding to the retreat slot, the negative portion being configured as a flexible bent metal sheet, the negative portion being configured to move towards a slot bottom of the retreat slot when subjected to an abutting force along the first direction away from the positive end wall.

2. The battery charging system of claim 1, wherein, The battery compartment comprises a first negative end wall; The battery slot comprises a first slot portion extending along the first direction, the first slot portion being configured to receive an AA battery, the first negative end wall being positioned at an end of the first slot portion and arranged opposite to the positive end wall, the first negative end wall having a first retreat slot formed therein; The electrical assembly comprises a first negative portion configured to be positioned corresponding to the first retreat slot, the first negative portion being configured as a flexible bent metal sheet, the first negative portion being configured to move towards a slot bottom of the first retreat slot when subjected to an abutting force along the first direction away from the positive end wall.

3. The battery charging system of claim 2, wherein, The battery compartment comprises a second negative end wall; The battery slot comprises a second slot portion extending along the first direction, the second slot portion being configured to receive an AAA battery, the second negative end wall being positioned at an end of the second slot portion and arranged opposite to the positive end wall, the second negative end wall having a second retreat slot formed therein; The electrical assembly comprises a second negative portion configured to be positioned corresponding to the second retreat slot, the second negative portion being configured as a flexible bent metal sheet, the second negative portion being configured to move towards a slot bottom of the second retreat slot when subjected to an abutting force along the first direction away from the positive end wall. The battery slot further comprises a second slot portion extending along the first direction, the second slot portion being configured to accommodate a AAA battery, the first slot portion and the second slot portion being coincident at the positive end wall, the second negative end wall being located at an end of the second slot portion and being arranged opposite to the positive end wall, the first negative end wall and the second negative end wall being staggered with each other in a third direction, the third direction being consistent with a direction of the slot opening of the first slot portion, the second negative end wall being provided with a second retreat slot; The electrical assembly comprises a second negative portion, the second negative portion being provided corresponding to the second retreat slot, the second negative portion being configured as another bent metal sheet capable of elastic deformation, the second negative portion being configured to move towards a slot bottom of the second retreat slot when subjected to an abutting force away from a positive end of the second slot portion along the first direction. 4.The battery charging system of any one of claims 1 to 3, wherein the positive portion is configured as a conductive metal sheet, the conductive metal sheet comprising a first positive protrusion and a second positive protrusion extending from the conductive metal sheet in the first direction, the first positive protrusion and the second positive protrusion being arranged in the third direction, and the second positive protrusion being closer to a bottom of the battery compartment in the third direction than the first positive protrusion, the conductive metal sheet being configured such that: the first positive protrusion contacts a positive electrode of an AA battery located in the battery slot, and the first positive protrusion and the second positive protrusion collectively contact a positive electrode of a AAA battery located in the battery slot. 5.The battery charging system of claim 4, wherein the first positive protrusion is closer to a center of the battery slot in the first direction than the second positive protrusion. 6.The battery charging system of claim 3, wherein the battery charging system further comprises a bottom cover connected to the bottom of the battery compartment, and a receiving cavity is formed between the bottom cover and the battery compartment; the electrical assembly further comprises a circuit board located in the receiving cavity, and the positive portion, the first negative portion, and the second negative portion are electrically connected to the circuit board. 7.The battery charging system of claim 6, wherein the electrical assembly further comprises an interface member connected to the circuit board, the interface member being configured to be connected to an external power source. 8.The battery charging system of claim 6, wherein the electrical assembly further comprises a charging indicator connected to the circuit board; the battery charging system further comprises a face cover openably connected to a top of the battery compartment, wherein the face cover is configured as a light-transmissive structure; or the face cover comprises a first window portion configured to be light-transmissive, the first window portion being provided corresponding to the charging indicator. 9.The battery charging system of claim 3, wherein the second negative portion is further away from a top of the battery compartment in the third direction than the first negative portion.

10. The battery charging system of claim 2, wherein, The battery compartment comprises a first stopper for constituting a bottom of the first yielding groove, the first stopper being used to prevent the first negative electrode part from moving in the first direction away from the battery groove.

11. The battery charging system of claim 10, wherein, The first negative electrode part comprises a first supporting section and a first bending section, the first supporting section is arranged in a third direction, the third direction is substantially parallel to the depth direction of the battery groove, one end of the first supporting section is fixedly arranged relative to the battery compartment, the other end of the first supporting section is connected to one end of the first bending section, the first bending section is located on the side of the first supporting section away from the first stopper, the center of curvature of the first bending section is located on the side of the first bending section facing the first stopper, and the first bending section is used to abut against the negative electrode of the AA battery.

12. The battery charging system according to claim 11, wherein the first supporting section and the stopper surface are arranged in the first direction; and / or the other end of the first bending section is arranged in the first direction away from the first supporting section; and / or a surface of the first bending section away from the first supporting section is formed with a first negative electrode protrusion, the first negative electrode protrusion being used to contact the negative electrode of the AA battery.

13. The battery charging system of claim 2 or 3, wherein, The battery charging system further comprises a first light guide member, the first light guide member being configured as a transparent or translucent structure, the first light guide member being arranged at the negative electrode end of the battery groove, the first light guide member comprising a first light guide surface and a second light guide surface, the first light guide surface being directed in the first direction towards the inside of the battery groove, the second light guide surface being directed in the same direction as the opening of the battery groove, and the first light guide member being used to transmit light emitted from the negative electrode end of the rechargeable battery. The first yielding groove is arranged in the first light guide member.

14. The battery charging system of claim 6, wherein, The battery charging system further comprises a charging indicator light and a second light guide member, the charging indicator light being connected to the circuit board, the battery compartment comprising a first viewing window arranged corresponding to the position of the charging indicator light, the first viewing window being located at the part of the battery compartment away from the bottom cover in the third direction, the second light guide member being connected between the first viewing window and the charging indicator light, and the first viewing window and the second light guide member being configured as light-transmissive structures.

15. The battery charging system of claim 3, wherein, The second negative electrode part is a second negative electrode spring, the second negative electrode spring comprising a second bending section and a third bending section connected in sequence, the center of curvature of the second bending section being located on the side of the second bending section facing the positive electrode end of the second groove part, and the center of curvature of the third bending section being located on the side of the third bending section away from the positive electrode end of the second groove part.

16. The battery charging system of claim 15, wherein, The second bending section and the third bending section substantially constitute an S-shaped bending structure, and the bending part of the third bending section is closer to the positive electrode end of the second groove part than the remaining part of the third bending section and the second bending section, so as to contact the negative electrode of the AAA battery located in the second groove part.

17. The battery charging system of claim 16, wherein, The battery charging system further comprises a circuit board, the second negative spring sheet is connected to the circuit board, the circuit board and / or the battery compartment is provided with a relief hole, the second bending section is movably arranged in the relief hole, the size of the relief hole along the first direction is greater than the size of the second bending section along the first direction, and the size of the relief hole along the first direction is less than the sum of the sizes of the second bending section and the third bending section along the first direction.

18. The battery charging system of claim 17, wherein, The second bending section is spaced apart from the hole wall of the positive end of the second groove portion along the first direction away from the second groove portion.

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