Nickel-metal hydride rechargeable battery

Abstract

The utility model provides a nickel-metal hydride rechargeable battery which comprises a nickel-metal hydride battery and a charging device, the nickel-metal hydride battery comprises a battery shell and a battery positive electrode end, and the battery positive electrode end is arranged on the battery shell; the charging device comprises a charging shell, a controller and a charging interface, the charging shell is of a structure with one end open, and the charging shell is electrically connected with the battery shell; a controller is arranged in the charging shell and is electrically connected with the charging shell; the charging interface is arranged on the surface of the charging shell and extends into the charging shell, and the charging interface is electrically connected with the controller; the side, facing the nickel-metal hydride battery, of the controller is electrically connected with the battery positive electrode end. And a booster circuit is arranged in the controller and is used for controlling the nickel-metal hydride battery to output constant voltage. According to the nickel-metal hydride rechargeable battery provided by the invention, the charging interface, the controller with the booster circuit and the nickel-metal hydride battery are packaged into a whole, constant voltage output greater than 1.2 V can be realized through the booster circuit, and the obtained nickel-metal hydride rechargeable battery is excellent in safety.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a nickel-metal hydride rechargeable battery. Background Technology

[0002] Current 1.5V USB lithium batteries on the market have safety issues, such as the risk of short circuits over short distances and explosions under high temperatures, leading to accidents. Nickel-metal hydride (NiMH) batteries are safer than lithium batteries. NiMH batteries with a Type-C charging interface combine traditional NiMH chemical energy storage technology with modern USB Type-C interface technology, allowing for charging via common USB Type-C cables. This design allows users to charge the battery directly with a USB Type-C charger, eliminating the need for a dedicated charger, thus simplifying the charging process and improving battery convenience and versatility. However, existing NiMH batteries with USB Type-C charging interfaces typically have a single-cell output voltage of 1.2V, which is insufficient for scenarios requiring higher voltage and safer battery use. There is an urgent need for a NiMH battery with a constant voltage output greater than 1.2V and high safety. Utility Model Content

[0003] This invention addresses the problem that existing nickel-metal hydride batteries with USB Type-C charging interfaces typically have an output voltage of 1.2V, which is insufficient for scenarios requiring higher voltage and safer battery use. This application provides a nickel-metal hydride rechargeable battery.

[0004] This utility model provides a nickel-metal hydride rechargeable battery, including a nickel-metal hydride battery and a charging device. The nickel-metal hydride battery includes a battery casing and a positive terminal, and the positive terminal is disposed on the battery casing.

[0005] The charging device includes a charging housing, a controller, and a charging interface. The charging housing has an open end and is electrically connected to the battery housing. The controller is disposed inside the charging housing and is electrically connected to the charging housing. The charging interface is disposed on the surface of the charging housing and extends into the interior of the charging housing. The charging interface is electrically connected to the controller. The side of the controller facing the nickel-metal hydride battery is electrically connected to the positive terminal of the battery.

[0006] The controller is equipped with a boost circuit for controlling the constant voltage output of the nickel-metal hydride battery.

[0007] Preferably, the boost circuit is used to control the constant voltage output of the nickel-metal hydride battery at 1.5V.

[0008] Preferably, the battery housing includes a first housing portion and a second housing portion, the first housing portion is disposed at one end of the second housing portion facing the charging device, the width of the first housing portion is smaller than the width of the second housing portion, and the positive terminal of the battery is disposed on the first housing portion;

[0009] The charging housing covers the outer periphery of the first housing portion and is electrically connected to the first housing portion. The end of the charging housing abuts against the end face of the second housing portion.

[0010] Preferably, the width of the first housing portion is h, the width of the second housing portion is h2, the wall thickness of the charging shell is h3, A = h + h3 - h2, and A is -0.5~0.5mm.

[0011] Preferably, A is -0.05~0.05mm.

[0012] Preferably, an annular groove is provided at the connection between the first housing portion and the second housing portion, and the annular groove is recessed in a direction away from the peripheral surface of the battery housing.

[0013] Preferably, the annular groove includes a first sidewall and a second sidewall, the first sidewall is disposed on the first housing portion, the second sidewall is disposed on the second housing portion, the projection of the second sidewall in the direction of the first sidewall extends out of the outer edge of the first sidewall, and the end face of the charging housing facing the second housing portion abuts against the second sidewall.

[0014] Preferably, the distance between the first sidewall and the second sidewall is 0~1mm.

[0015] Preferably, the charging device further includes a positive electrode assembly, which includes a charging positive electrode and a connecting positive electrode. Both the charging positive electrode and the connecting positive electrode are electrically connected to the controller. The charging positive electrode is disposed on the surface of the charging housing. The connecting positive electrode is disposed inside the charging housing and is located on the side of the controller facing the nickel-metal hydride battery. The end of the connecting positive electrode away from the controller is electrically connected to the positive terminal of the battery.

[0016] Preferably, the positive terminal of the battery is disposed on the side of the battery casing facing the charging device, and the side of the positive terminal of the battery away from the battery casing is electrically connected to the connecting positive electrode through a metal part.

[0017] Preferably, the positive terminal of the battery includes a positive terminal post and a positive terminal post explosion-proof component. The positive terminal post has a groove on the side facing the battery housing, and the positive terminal post explosion-proof component is disposed in the groove and connected to the battery housing.

[0018] The nickel-metal hydride rechargeable battery provided in this application integrates the charging interface, the controller with the boost circuit, and the nickel-metal hydride battery into one unit. Through the boost circuit, a constant voltage output of greater than 1.2V can be achieved. The resulting nickel-metal hydride rechargeable battery has excellent safety, high energy, fast charging speed, long service life, and is suitable for a wide temperature range. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a nickel-metal hydride rechargeable battery with a horizontally placed charging interface, according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of a nickel-metal hydride rechargeable battery with a vertically placed charging interface, according to an embodiment of this utility model.

[0021] 1. Battery casing; 101. First casing portion; 102. Second casing portion; 2. Battery positive terminal; 201. Battery positive terminal post; 202. Explosion-proof component for battery positive terminal post; 3. Charging casing; 4. Charging interface; 5. Annular groove; 501. First sidewall; 502. Second sidewall; 6. Positive electrode assembly; 601. Charging positive electrode component; 602. Connecting positive electrode component; 7. Controller; 8. Metal component. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] To illustrate the technical solution of this utility model, specific embodiments are described below.

[0024] like Figure 1-2 As shown, this application provides a nickel-metal hydride rechargeable battery, including a nickel-metal hydride battery and a charging device. The nickel-metal hydride battery includes a battery casing 1 and a positive terminal 2, which is disposed on the battery casing 1.

[0025] The nickel-metal hydride battery used is a nickel-metal hydride battery that can be directly charged and discharged using existing technology. The nickel-metal hydride battery includes a positive electrode, a negative electrode, a separator, an electrolyte, a battery casing 1, and a cover plate, which are then assembled, sealed, and formed to obtain the nickel-metal hydride battery.

[0026] The charging device includes a charging housing 3, a controller 7, and a charging interface 4. The charging housing 3 has an open structure at one end and is electrically connected to the battery housing 1.

[0027] Specifically, such as Figure 1As shown, the charging casing 3 has an open end facing the nickel-metal hydride battery. The charging casing 3 is electrically connected to the battery casing 1, which can be achieved by laser welding.

[0028] The controller 7 is installed inside the charging housing 3 and is electrically connected to the charging housing 3; the controller 7 is equipped with a boost circuit for controlling the constant voltage output of the nickel-metal hydride battery.

[0029] Specifically, the controller 7 and boost circuit in this application are both prior art. For example, they could be chips with built-in boost circuits, i.e., existing boost chips. The controller 7 contains a boost circuit that can convert the output current and voltage into preset current and voltage. The boost circuit in the controller 7 of this application can convert the output voltage of the NiMH battery into a constant voltage greater than 1.2V. The NiMH rechargeable battery of this application incorporates an existing controller 7 with a boost circuit into the charging device, enabling the NiMH battery to achieve a constant voltage output greater than 1.2V.

[0030] The charging interface 4 is disposed on the surface of the charging housing 3 and extends into the interior of the charging housing 3. The charging interface 4 is electrically connected to the controller 7. The side of the controller 7 facing the nickel-metal hydride battery is electrically connected to the positive terminal 2 of the battery.

[0031] The charging device includes a charging port 4, which allows for convenient charging by connecting to power banks, mobile phones, laptops, TVs, and other electronic devices via a data cable. Charging port 4 can be a USB Type-C interface.

[0032] Specifically, such as Figure 1 As shown, the charging interface 4 is disposed on the surface of the charging housing 3 and extends into the interior of the charging housing 3. The controller 7 is disposed inside the charging housing 3. The extension of the charging interface 4 into the interior of the charging housing 3 allows the charging interface 4 to connect with the controller 7. The controller 7 can control the charging interface 4, such as the USB connector at the Type-C interface, to charge the nickel-metal hydride battery. The charging interface 4 is connected to the positive terminal 2 of the battery and the battery housing 1, facilitating the chip 7 to control the charging interface 4 to charge the nickel-metal hydride battery.

[0033] The nickel-metal hydride rechargeable battery provided in this application integrates the charging interface 4, the controller 7 with the boost circuit, and the nickel-metal hydride battery into one unit. Through the boost circuit, a constant voltage output of greater than 1.2V can be achieved. The resulting nickel-metal hydride rechargeable battery has excellent safety, high energy, fast charging speed, long service life, and is suitable for a wide temperature range.

[0034] In some embodiments, the boost circuit is used to control the constant voltage output of the nickel-metal hydride battery at 1.5V.

[0035] The boost circuit controls the 1.5V constant voltage output of the nickel-metal hydride battery, replacing the existing 1.5V constant voltage lithium-ion USB rechargeable battery and solving the safety issues associated with the current 1.5V constant voltage lithium-ion USB rechargeable battery. The nickel-metal hydride rechargeable battery of this application has excellent safety, high energy density, fast charging speed, long service life, and is suitable for a wide temperature range.

[0036] The battery housing 1 includes a first housing portion 101 and a second housing portion 102. The first housing portion 101 is disposed at one end of the second housing portion 102 facing the charging device. The width of the first housing portion 101 is smaller than the width of the second housing portion 102. The positive terminal 2 of the battery is disposed on the first housing portion 101.

[0037] The charging housing 3 is disposed on the outer periphery of the first housing portion 101 and is electrically connected to the first housing portion 101. The end of the charging housing 3 abuts against the end face of the second housing portion 102.

[0038] Specifically, the charging housing 3 is disposed around the outer periphery of the first housing portion 101, such as... Figure 1 As shown, the shell wall at the open end of the charging shell 3 is disposed on the outer periphery of the first shell portion 101, such that the shell wall at the open end of the charging shell 3 surrounds the outer periphery of the first shell portion 101. The first shell portion 101 is electrically connected to the charging shell 3. The method of achieving electrical connection includes welding, such as laser welding the overlapping portion of the outer shell wall of the first shell portion 101 and the inner shell wall of the charging shell 3. When the materials of the first shell portion 101 and the charging shell 3 are both metal materials, the overlapping portion can be directly laser welded to achieve electrical connection between the first shell portion 101 and the charging shell 3.

[0039] like Figure 1 As shown, the battery casing 1 includes a first casing portion 101 and a second casing portion 102. The charging outer shell 3 covers the outer periphery of the first casing portion 101, that is, the first casing portion 101 is disposed inside the charging outer shell 3, and the second casing portion 102 is disposed outside the charging outer shell 3. The end face of the second casing portion 102 is in contact with the end face of the charging outer shell 3. The first casing portion 101 and the charging outer shell 3 are electrically connected. The first casing portion 101 and the second casing portion 102 are also electrically connected. Therefore, the second casing portion 102 and the charging outer shell 3 are also electrically connected.

[0040] The end face of the second housing portion 102 abuts against the end of the charging housing 3, that is, the end of the second housing portion 102 facing the charging device abuts against the end of the charging housing 3 facing the nickel-metal hydride battery. By not placing the entire nickel-metal hydride battery inside the charging housing 3, and limiting the width of the first housing portion 101 to be less than the width of the second housing portion 102, the difference in width between the first housing portion 101 and the second housing portion 102 is equal to the thickness of the charging housing 3. Therefore, the resulting nickel-metal hydride rechargeable battery does not require additional thickness to the charging housing 3, reducing the space occupied by the nickel-metal hydride rechargeable battery.

[0041] The nickel-metal hydride rechargeable battery provided in this application has a battery casing 1 including a first casing portion 101 and a second casing portion 102. A charging shell 3 covers the outer periphery of the first casing portion 101. The first casing portion 101 is electrically connected to the charging shell 3, that is, the first casing portion 101 is disposed inside the charging shell 3. The end of the charging shell 3 abuts against the end face of the second casing portion 102, that is, the second casing portion 102 is disposed outside the charging shell 3. The entire nickel-metal hydride battery is not placed inside the charging shell 3, and there is no need to use various related accessories to electrically connect to the nickel-metal hydride battery separately. The manufacturing process is simple and the manufacturing cost is reduced. The width of the first casing portion 101 is limited to the width of the second casing portion 102. The difference between the widths of the first casing portion 101 and the second casing portion 102 is the thickness of the charging shell 3. The resulting nickel-metal hydride rechargeable battery does not require additional thickness of the charging shell 3, thus reducing the space occupied by the nickel-metal hydride rechargeable battery.

[0042] The nickel-metal hydride rechargeable battery provided in this application integrates the built-in USB Type-C charging interface 4, controller 7, positive electrode component 6, and nickel-metal hydride battery into one unit, forming a 1.5V constant voltage output nickel-metal hydride USB rechargeable battery. It has excellent safety, high energy, fast charging speed, long service life, and is suitable for a wide temperature range. It can effectively replace the 1.5V constant voltage lithium-ion USB rechargeable battery and solve its poor safety problem.

[0043] In this embodiment, the width of the first housing portion 101 is h1, the width of the second housing portion 102 is h2, the wall thickness of the charging outer shell 3 is h3, A=h1+h3-h2, and A is -0.5~0.5mm.

[0044] Specifically, A is -0.5 to 0.5 mm. Since A has a relatively small range, it represents the tolerance range between the width of the first housing portion 101 after welding and the thickness of the charging housing 3 compared to the width of the first housing portion 101. By limiting A to -0.5 to 0.5 mm, the overall thickness of the resulting nickel-metal hydride rechargeable battery is small after welding the outer wall of the first housing portion 101 to the inner wall of the charging housing 3, thus reducing the space occupied by the nickel-metal hydride rechargeable battery.

[0045] like Figure 1 As shown, in the x-direction, the length of the first housing portion 101 is the width h1 of the first housing portion 101; in the x-direction, the length of the second housing portion 102 is the width h2 of the second housing portion 102; and in the x-direction, the length of the charging shell 3 is the shell thickness h3 of the charging shell 3.

[0046] In a preferred embodiment, A is -0.05~0.05mm.

[0047] Within the preferred range of A, a smaller value of A does not substantially increase the thickness of the charging casing 3, thus reducing the space occupied by the nickel-metal hydride rechargeable battery.

[0048] In this embodiment, an annular groove 5 is provided at the connection between the first housing portion 101 and the second housing portion 102, and the annular groove 5 is recessed in a direction away from the circumference of the battery housing 1.

[0049] Specifically, during the manufacturing process of nickel-metal hydride batteries, a grooving process is performed on the first housing part 101 of the battery housing 1, so that the width of the first housing part 101 is smaller than the width of the second housing part 102. During the grooving process, an annular groove 5 is formed at the connection between the first housing part 101 and the second housing part 102, and the annular groove 5 is recessed in a direction away from the circumference of the battery housing 1.

[0050] In this embodiment, the annular groove 5 includes a first sidewall 501 and a second sidewall 502. The first sidewall 501 is disposed on the first housing portion 101, and the second sidewall 502 is disposed on the second housing portion 102. The projection of the second sidewall 502 in the direction of the first sidewall 501 extends out of the outer edge of the first sidewall 501. The end face of the charging housing 3 facing the second housing portion 102 abuts against the second sidewall 502.

[0051] Specifically, such as Figure 1 As shown, a first sidewall 501 is disposed on the first housing portion 101, and a second sidewall 502 is disposed on the second housing portion 102. Because the width of the first housing portion 101 is smaller than the width of the second housing portion 102, the projection of the second sidewall 502 onto the direction of the first sidewall 501 extends beyond the outer edge of the first sidewall 501; that is, as shown... Figure 1 As shown, in the x-direction, the length of the first sidewall 501 is less than the length of the second sidewall 502. The statement that the end face of the charging housing 3 facing the second housing portion 102 abuts against the second sidewall 502 means that the end face of the opening end of the charging housing 3 facing the second housing portion 102 abuts against the side surface of the second sidewall 502 facing the first housing portion 101.

[0052] In this embodiment, the distance between the first sidewall 501 and the second sidewall 502 is 0~1mm.

[0053] like Figure 1 As shown, the distance between the first sidewall 501 and the second sidewall 502 in the y-axis direction is 0~1mm. The distance between the first sidewall 501 and the second sidewall 502 is limited to 0~1mm, which is the height of the annular groove 5 formed when the first housing part 101 is grooved and closed.

[0054] In a preferred embodiment, the distance d between the first sidewall 501 and the second sidewall 502 is 0 < d ≤ 1 mm.

[0055] In this embodiment, the charging device further includes a positive electrode assembly 6, which includes a charging positive electrode 601 and a connecting positive electrode 602. Both the charging positive electrode 601 and the connecting positive electrode 602 are electrically connected to the controller 7. The charging positive electrode 601 is disposed on the surface of the charging housing 3. The connecting positive electrode 602 is disposed inside the charging housing 3 and is disposed on the side of the controller 7 facing the nickel-metal hydride battery. The end of the connecting positive electrode 602 facing the controller 7 is electrically connected to the positive terminal 2 of the battery.

[0056] Specifically, the positive electrode assembly 6 includes a charging positive electrode 601 and a connecting positive electrode 602. The connecting positive electrode 602 is disposed on the surface of the charging housing 3. The end of the connecting positive electrode 602 facing the nickel-metal hydride battery is electrically connected to the controller 7, and the end of the connecting positive electrode 602 away from the nickel-metal hydride battery extends from the surface of the charging housing 3 in a direction away from the charging housing 3, such as... Figure 1 As shown, the cross-sectional structure of the positive electrode 602 is square; it can be understood that the cross-sectional structure of the positive electrode 602 is a polygon, an ellipse, or a combination of straight lines and arcs. The polygon is an n-fold transformation, where n≥3.

[0057] The end of the positive electrode 602 away from the nickel-metal hydride battery is electrically connected to the controller 7, and the side of the positive electrode 602 facing the nickel-metal hydride battery is electrically connected to the positive terminal 2 of the battery.

[0058] like Figure 1 As shown, the controller 7 and the positive electrode 602 are both located inside the charging housing 3, while the positive electrode 601 is located on the surface of the charging housing 3, reducing the space occupied by the charging housing 3.

[0059] The nickel-metal hydride battery is charged using the charging interface 4, such as the USB Type-C charging interface 4. When the nickel-metal hydride battery is fully charged and in operation, the charging positive component 601 is the positive side of the nickel-metal hydride rechargeable battery. The charging positive component 601 is connected to the positive terminal of the external electrical device, and the casing of the nickel-metal hydride battery or the charging shell 3 is connected to the negative terminal of the external electrical device to discharge the external electrical device.

[0060] The positive terminal 2 of the battery is disposed on the side of the battery housing 1 facing the charging device, and the side of the positive terminal 2 away from the battery housing 1 is electrically connected to the positive electrode 602 via a metal part 8.

[0061] Specifically, the positive terminal 2 of the battery is electrically connected to the positive terminal 602 via the metal part 8, thereby realizing the electrical connection between the battery and the controller 7.

[0062] In this embodiment, the positive terminal 2 of the battery is disposed on the side of the first housing portion 101 away from the second housing portion 102, and the side of the positive terminal 2 away from the first housing portion 101 is electrically connected to the connecting positive electrode 602 through the metal part 8.

[0063] Specifically, the positive terminal 2 of the battery is electrically connected to the positive terminal 602 via the metal part 8. When charging using the charging interface 4, such as the USB Type-C charging interface 4, the charging interface 4 can be connected to the positive terminal of the battery through the electrical connection between the positive terminal 602 and the positive terminal 2 of the battery.

[0064] In this embodiment, the metal component 8 is a nickel strip.

[0065] In this embodiment, the positive terminal 2 of the battery includes a positive terminal post 201 and a positive terminal post explosion-proof component 202. The positive terminal post 201 has a groove on the side facing the battery housing 1, and the positive terminal post explosion-proof component 202 is disposed in the groove and is connected to the battery housing 1.

[0066] Specifically, the positive terminal 2 of the battery includes a positive terminal post 201 and a positive terminal post explosion-proof component 202. The positive terminal post 201 has a groove on the side facing the first housing part 101, and the positive terminal post explosion-proof component 202 is disposed in the groove. The positive terminal post explosion-proof component 202 is connected to the first housing part 101.

[0067] Specifically, the side of the battery positive terminal 201 facing the charging device is electrically connected to the metal part 8, and the side of the battery positive terminal 201 away from the charging device is connected to the first housing part 101; the battery positive terminal explosion-proof part 202 is disposed in the groove, and the side of the battery positive terminal explosion-proof part away from the charging device is connected to the first housing part 101.

[0068] In this embodiment, a charging indicator is provided on the outer surface of the charging housing 3 away from the nickel-metal hydride battery. The charging indicator can be a charging indicator light.

[0069] In this embodiment, the charging indicator is arranged around the charging positive electrode 601.

[0070] The charging indicator is arranged around the charging positive electrode 601 to reduce the space occupied by the charging indicator.

[0071] It should be noted that the charging interface 4 of this application preferably has a USB Type-C interface. The charging interface 4 on the surface of the charging shell 3 can be arranged horizontally with its extension direction parallel to the x-axis, vertically with its extension direction parallel to the y-axis, or inclined with its extension direction at an angle to either the x-axis or the y-axis. Figure 1 As shown, in the x-direction, the length of charging interface 4 is 'a', and in the y-direction, the length of charging interface 4 is 'b', where 'a' is greater than 'b'. The extension direction is parallel to the x-axis, and charging interface 4 is horizontally positioned. Figure 2 As shown, if a is less than b, the extension direction is parallel to the y-axis, and the charging interface 4 is set vertically.

[0072] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A nickel-metal hydride rechargeable battery, characterized in that, The invention includes a nickel-metal hydride battery and a charging device. The nickel-metal hydride battery includes a battery casing (1) and a positive terminal (2), wherein the positive terminal (2) is disposed on the battery casing (1). The charging device includes a charging housing (3), a controller (7), and a charging interface (4). The charging housing (3) has an open end and is electrically connected to the battery housing (1). The controller (7) is disposed inside the charging housing (3) and is electrically connected to the charging housing (3). The charging interface (4) is disposed on the surface of the charging housing (3) and extends into the interior of the charging housing (3). The charging interface (4) is electrically connected to the controller (7). The controller (7) is electrically connected to the positive terminal (2) of the battery on the side facing the nickel-metal hydride battery. The controller (7) is equipped with a boost circuit for controlling the constant voltage output of the nickel-metal hydride battery.

2. The nickel-metal hydride rechargeable battery according to claim 1, characterized in that, The boost circuit is used to control the constant voltage output of the nickel-metal hydride battery at 1.5V.

3. The nickel-metal hydride rechargeable battery according to claim 1, characterized in that, The battery casing (1) includes a first casing portion (101) and a second casing portion (102). The first casing portion (101) is disposed at one end of the second casing portion (102) facing the charging device. The width of the first casing portion (101) is smaller than the width of the second casing portion (102). The positive terminal (2) of the battery is disposed on the first casing portion (101). The charging housing (3) covers the outer periphery of the first housing part (101) and is electrically connected to the first housing part (101). The end of the charging housing (3) abuts against the end face of the second housing part (102).

4. The nickel-metal hydride rechargeable battery according to claim 3, characterized in that, The width of the first housing part (101) is h1, the width of the second housing part (102) is h2, the wall thickness of the charging shell (3) is h3, A=h1+h3-h2, and A is -0.5~0.5mm.

5. The nickel-metal hydride rechargeable battery according to claim 3, characterized in that, A is -0.05~0.05mm.

6. The nickel-metal hydride rechargeable battery according to claim 3, characterized in that, An annular groove (5) is provided at the connection between the first housing part (101) and the second housing part (102), and the annular groove (5) is recessed in a direction away from the circumference of the battery housing (1).

7. The nickel-metal hydride rechargeable battery according to claim 6, characterized in that, The annular groove (5) includes a first sidewall (501) and a second sidewall (502). The first sidewall (501) is disposed on the first housing portion (101), and the second sidewall (502) is disposed on the second housing portion (102). The projection of the second sidewall (502) in the direction of the first sidewall (501) extends out of the outer edge of the first sidewall (501). The end face of the charging housing (3) facing the second housing portion (102) abuts against the second sidewall (502).

8. The nickel-metal hydride rechargeable battery according to claim 7, characterized in that, The distance between the first sidewall (501) and the second sidewall (502) is 0~1mm.

9. The nickel-metal hydride rechargeable battery according to claim 1, characterized in that, The charging device further includes a positive electrode assembly (6), which includes a charging positive electrode (601) and a connecting positive electrode (602). Both the charging positive electrode (601) and the connecting positive electrode (602) are electrically connected to the controller (7). The charging positive electrode (601) is disposed on the surface of the charging housing (3). The connecting positive electrode (602) is disposed inside the charging housing (3). The connecting positive electrode (602) is disposed on the side of the controller (7) facing the nickel-metal hydride battery. The end of the connecting positive electrode (602) away from the controller (7) is electrically connected to the positive terminal (2) of the battery.

10. The nickel-metal hydride rechargeable battery according to claim 9, characterized in that, The positive terminal (2) of the battery is located on the side of the battery casing (1) facing the charging device, and the side of the positive terminal (2) away from the battery casing (1) is electrically connected to the connecting positive terminal (602) through a metal part (8).

11. The nickel-metal hydride rechargeable battery according to claim 8, characterized in that, The positive terminal (2) of the battery includes a positive terminal post (201) and a positive terminal post explosion-proof component (202). The positive terminal post (201) has a groove on the side facing the battery housing (1). The positive terminal post explosion-proof component (202) is disposed in the groove and is connected to the battery housing (1).

Images