Lithium battery pack for electric tool

Abstract

The utility model discloses a lithium battery pack for an electric tool, which comprises a battery pack shell and an inserting part, the outer side of the battery pack shell is sleeved with a heating shell, the bottom of the heating shell is provided with a heat preservation bottom plate, a heating material is placed on the heat preservation bottom plate, the heat preservation bottom plate is connected with a first connecting block, and the first connecting block is connected with a second connecting block. A rack assembly connected with the first connecting block is arranged above the first connecting block, and a gear assembly matched with the rack assembly is arranged in the middle of the rack assembly. Compared with the prior art, the lithium battery pack has the beneficial effects that the heating shell with the gear assembly and the heating material is arranged outside the lithium battery pack, so that the heating material can be used for heating the lithium battery in a fitting manner after the electric tool is inserted, and the heating material is released from the lithium battery and is used for preserving heat in the shell after the electric tool is pulled out; therefore, the lithium battery pack for the electric tool can still work normally in an extremely cold environment.

Description

TECHNICAL FIELD

[0001] The utility model belongs to lithium battery pack field, specifically about a kind of lithium battery pack for electric tool. BACKGROUND

[0002] Lithium battery pack for electric tool is a kind of battery assembly, which is inserted at the bottom of handheld electric tool, and the contact head on the insertion plate is connected with the bottom of electric tool to provide power transmission for electric tool. Five to fifteen lithium batteries are usually configured inside the lithium battery pack to maintain the endurance of the electric tool.

[0003] When the lithium battery pack installed on the electric tool is in a low-temperature operating environment, the battery performance will be greatly reduced. When the operating environment is close to-10℃, the battery capacity and terminal voltage will be greatly reduced, and the electric tool may suddenly run out of power or have a short use time. When the operating environment drops to close to-20℃, some lithium battery packs will not be able to charge and discharge. SUMMARY

[0004] The utility model aims at providing a lithium battery pack for electric tool to solve the above problems.

[0005] To achieve the above purpose, the utility model provides a lithium battery pack for electric tool, which comprises a battery pack shell and an insertion part. A heating shell is sleeved outside the battery pack shell. A heat preservation bottom plate is arranged at the bottom of the heating shell. A heating material is placed on the heat preservation bottom plate. A first connecting block is connected to the heat preservation bottom plate. A rack assembly connected to the first connecting block is arranged above the first connecting block. A gear assembly matched with the rack assembly is arranged in the middle of the rack assembly. A second connecting block is connected to the side of the rack assembly away from the first connecting block. An elastic assembly is connected to the lower end surface of the second connecting block. A pressing plate is connected to the upper end surface of the second connecting block. A movement groove matched with the pressing plate is formed in the heating shell.

[0006] In one or more embodiments of the utility model, the rack assembly comprises a first rack assembly and a second rack assembly. The first rack assembly comprises a first stabilizing strip and a first rack. The first stabilizing strip and the first rack are fixedly connected to the first connecting block. The second gear assembly comprises a second rack and a second stabilizing strip. The second rack and the second stabilizing strip are fixedly connected to the second connecting block.

[0007] In one or more embodiments of the utility model, the gear assembly is installed between the first rack and the second rack. The gear assembly comprises a gear and a fixed shaft. The gear is matched with the first rack and the second rack. The fixed shaft is fixedly connected to the inner side of the heating shell.

[0008] In one or more embodiments of the utility model, the second stabilizing strip is fixedly connected with a connecting plate below, and the connecting plate is installed with a spring on the lower end face.

[0009] In one or more embodiments of the utility model, the spring is fixedly connected with the lower end face of the connecting plate and the inner bottom of the heating shell respectively at both ends, and the spring is a compression spring.

[0010] In one or more embodiments of the utility model, a pair of rotating parts are installed on the heating shell, a rotating part is installed on the rotating cover between the pair of rotating parts, a rotating shaft is installed on the rotating part, and the rotating shaft penetrates the battery pack shell and the rotating cover and is matched with the rotating part on the battery pack shell and the rotating cover.

[0011] In one or more embodiments of the utility model, a first magnetic attraction block is installed on the heating shell, and a second magnetic attraction block matched with the first magnetic attraction block is installed on the rotating cover.

[0012] In one or more embodiments of the utility model, a charging port is arranged on the battery pack shell, and a through slot matched with the charging port is formed in the heating shell.

[0013] In one or more embodiments of the utility model, a pair of heat preservation side plates are installed in the battery pack shell, and the distance from the pair of heat preservation side plates to the inner wall of the battery pack shell is matched with the width of the first stabilizing strip, the first rack, the second rack and the second stabilizing strip.

[0014] In one or more embodiments of the utility model, a plurality of supporting plates are arranged on the pair of heat preservation side plates, and the upper end face of the supporting plate is matched with the lower end face of the battery pack shell.

[0015] Compared with the prior art, the utility model has the beneficial effects that the heating shell with the gear assembly and the heating material is installed outside the lithium battery pack, the heating material is used for heating the lithium battery after the electric tool is inserted, the heating material is separated from the lithium battery and the inside of the shell is heat preserved after the electric tool is pulled out, so that the lithium battery pack for electric tools can work normally in extremely cold environment. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a first structure diagram of a lithium battery pack for electric tools in one embodiment of the utility model;

[0017] Figure 2 It is a second structure diagram of a lithium battery pack for electric tools in one embodiment of the utility model;

[0018] Figure 3 It is a structure diagram of a heat preservation shell of a lithium battery pack for electric tools in one embodiment of the utility model;

[0019] Figure 4 It is the explosion map of the heat preservation shell of the lithium battery pack for electric tool in one embodiment of the utility model;

[0020] Figure 5 It is the gear assembly structure diagram of the heat preservation shell of the lithium battery pack for electric tool in one embodiment of the utility model.

[0021] Main figure mark explanation:

[0022] 1-battery pack shell, 101-charging port, 2-plug-in part, 201-plug-in slot, 3-warming shell, 301-through slot, 302-rotation shaft, 303-first magnetic attraction piece, 304-moving slot, 4-rotation cover, 401-second magnetic attraction piece, 5-heat preservation side plate, 501-bearing plate, 6-heat preservation bottom plate, 601-first connecting block, 602-first stabilizing strip, 603-first rack, 604-second rack, 605-second stabilizing strip, 606-gear, 607-fixed shaft, 7-connecting plate, 701-spring, 8-pressing plate, 801-second connecting block, 9-heating bag. Specific implementation

[0023] The specific implementation of the utility model will be described in detail below with reference to the drawings, but it should be understood that the protection scope of the utility model is not limited by the specific implementation.

[0024] Reference Figures 1-3 As shown in the figure, a lithium battery pack for electric tool, by the electric tool is inserted in plug-in part 2, the electric tool is continuously transmitted. When the lithium battery pack for electric tool is placed in low temperature operating environment, the battery performance will be greatly discounted or even cannot be used, by installing warming shell 3 outside the lithium battery pack, and by the internal gear assembly and elastic assembly to control the up and down movement of heating bag 9 on heat preservation bottom plate 6, when the electric tool is inserted in plug-in slot 201, heating bag 9 is attached to battery pack shell 1, when the electric tool is pulled out of plug-in slot 201, heating bag 9 is separated from battery pack shell 1. Through two kinds of movement mode, the lithium battery pack is heated and the inside of warming shell 3 is preserved respectively.

[0025] The lithium battery pack for electric tool includes battery pack shell 1 and plug-in part 2, plug-in part 2 cooperates with the bottom of electric tool, and after insertion, the electric tool and lithium battery pack are fixed by locking part on plug-in part 2. Charging port 101 is arranged on battery pack shell 1, and through slot 301 cooperating with charging port 101 is opened on warming shell 3, the charger of lithium battery pack can penetrate through slot 301 to charge lithium battery pack, and the opened slot 301 can ensure that lithium battery pack is heated synchronously when charging, avoiding the situation that lithium battery cannot be charged and discharged in low temperature or even extremely cold operating environment.

[0026] Referring to Figures 1-3 As shown in the figure, the battery pack shell 1 is sleeved with a heating shell 3, the heating shell 3 wraps around the battery pack shell 1 and the bottom, the heating shell 3 is installed by opening the rotating cover 4 and inserting the battery pack shell 1 into the heating shell 3, the heating shell 3 can support the battery pack shell 1, and the upper end of the heating shell 3 is clamped to the upper part of the battery pack shell 1, the heating shell 3 fixes the battery pack shell 1 in the heating shell 3 through the upper clamping and bottom support.

[0027] Referring to Figures 4-5 As shown in the figure, a pair of heat preservation side plates 5 are installed in the battery pack shell 1, the heat preservation side plates 5 are provided with a velvet surface for heat preservation, the distance between the heat preservation side plates 5 and the inner wall of the battery pack shell 1 is matched with the width of the first stabilizing strip 602, the first rack 603, the second rack 604 and the second stabilizing strip 605, that is, the heat preservation side plates 5 not only play a role in heat preservation on both sides of the battery pack shell 1, but also limit the displacement of the rack assembly to ensure the stable displacement of the rack assembly. A plurality of supporting plates 501 are also provided on the heat preservation side plates 5, the upper end surface of the supporting plates 501 is matched with the lower end surface of the battery pack shell 1, that is, the supporting plates 501 are used to support the battery pack shell 1, and when the battery pack shell 1 is inserted into the heating shell 3, the supporting plates 501 lift the battery pack shell 1.

[0028] Referring to Figures 1-3 As shown in the figure, a heat preservation bottom plate 6 is provided at the bottom of the heating shell 3, the heat preservation bottom plate 6 is provided with a velvet heat preservation layer on the surface, and a heating material is placed on the heat preservation bottom plate 6, the heating material includes a self-heating warm patch and a self-heating warm pack, etc., and the appropriate type and quantity of heating material can be selected according to the temperature of the electric tool working environment.

[0029] A pair of rotating parts are installed on the heating shell 3, a rotating part on the rotating cover 4 is installed between the pair of rotating parts on the heating shell 3, a rotating shaft 302 is installed on the rotating part, the rotating shaft 302 penetrates the battery pack shell 1 and the rotating cover 4 and is matched with the rotating parts on the battery pack shell 1 and the rotating cover 4, that is, the rotating cover 4 can rotate around the rotating shaft 302 installed on the heating shell 3 to open and close, and the heating shell 3 is opened and closed by rotating opening and closing.

[0030] Referring to Figures 1-3 As shown in the figure, a first magnetic block 303 is installed on the heating shell 3, and a second magnetic block 401 matched with the first magnetic block 303 is installed on the rotating cover 4, when the rotating cover 4 is rotated to close, the second magnetic block 401 on the rotating cover 4 is adsorbed with the first magnetic block 303 on the heating shell 3, which fixes the rotating cover 4.

[0031] Referring to Figures 4-5As shown, the first connecting block 601 is fixedly connected to the heat preservation bottom plate 6, and a rack assembly connected with the first connecting block 601 is arranged above the first connecting block 601. The rack assembly can reciprocate up and down. A gear assembly matched with the rack assembly is arranged in the middle of the rack assembly. The opposite rack assemblies complete relative movement through the gear assemblies matched therewith. When one of the rack assemblies moves up and down, the opposite rack assembly moves in the opposite direction.

[0032] The second connecting block 801 is connected to the side of the rack assembly away from the first connecting block 601. The pressing plate 8 is connected to the upper end surface of the second connecting block 801. The elastic assembly is connected to the lower end surface of the second connecting block 801. When the electric tool is inserted into the plug-in groove 201, the pressing plate 8 is pressed synchronously to compress the elastic assembly. When the electric tool is pulled out of the plug-in groove 201, the elastic assembly drives the pressing plate 8 to reset upward. The movement groove 304 matched with the pressing plate 8 is arranged on the warming shell 3. In the reciprocating process, the pressing plate 8 moves along the internal space of the movement groove 304. The part of the pressing plate 8 exceeding the movement groove 304 is the contact part contacting the bottom of the electric tool. That is, the bottom of the electric tool drives the connecting part of the pressing plate 8 to move by pressing the part of the pressing plate 8 exceeding the movement groove 304.

[0033] Reference Figures 4-5 As shown, the rack assembly includes a first rack assembly and a second rack assembly. The two rack assemblies cooperate to realize relative movement. The first rack assembly includes a first stabilizing strip 602 and a first rack 603. The first stabilizing strip 602 and the first rack 603 are fixedly connected to the first connecting block 601. The first rack 603 is engaged with the gear. The first stabilizing strip 602 is used to stabilize the movement state of the first rack 603. The second gear assembly includes a second rack 604 and a second stabilizing strip 605. The second rack 604 and the second stabilizing strip 605 are fixedly connected to the second connecting block 801. The second rack 604 is engaged with the gear. The second stabilizing strip 605 is used to stabilize the movement of the second rack 604 and also used to connect the elastic assembly below.

[0034] Reference Figures 4-5 As shown, the gear assembly is installed between the first rack 603 and the second rack 604. The gear assembly includes a gear 606 and a fixed shaft 607. The gear 606 is matched with the first rack 603 and the second rack 604. The fixed shaft 607 is fixedly connected to the inner side of the warming shell 3. The gear 606 rotates around the fixed shaft 607. The first rack 603 is engaged with the gear 606 opposite to the second rack 604. When the second rack 604 moves downward, the gear 606 rotates to drive the first rack 603 to move upward. When the second rack 604 moves upward, the gear 606 rotates to drive the first rack 603 to move downward.

[0035] Further, when the electric tool base presses the pressing plate 8 downward, the second connecting block 801 connected on the pressing plate 8 drives the second rack 604 to move downward, at this time, the first rack 603 moves upward and synchronously drives the first connecting block 601 and the heat preservation bottom plate 6 connected below to move upward. The upward movement of the heat preservation bottom plate 6 drives the heat pack 9 supported thereon to synchronously adhere upward, and the heat is concentrated to be transmitted to the bottom of the battery pack shell 1, so that the battery assembly in the battery pack shell 1 is quickly heated.

[0036] Reference Figures 4-5 As shown, the second stabilizing strip 605 is fixedly connected with the connecting plate 7 below, the spring 701 is installed on the lower end face of the connecting plate 7, and the two ends of the spring 701 are fixedly connected with the lower end face of the connecting plate 7 and the inner bottom of the heating shell 3 respectively. The spring 701 is a compression spring. When the pressing plate 8 and the second connecting block 801 move downward, the second stabilizing strip 605 moves downward to force the spring assembly to be compressed. When there is no downward force, the spring assembly pushes the pressing plate 8 and the second connecting block 801 to reset upward, and at the same time drives the second rack 604 to move upward so as to make the heat preservation bottom plate 6 reset downward.

[0037] Further, when the electric tool is separated from the plug-in slot 201, the elastic assembly drives the second stabilizing strip 605 to move upward, synchronously drives the pressing plate 8, the second connecting block 801 and the second rack 604 to move upward, the second rack 604 drives the first rack 603 to move downward through the gear 606 in the process of moving upward, and the first connecting block 601 and the heat preservation bottom plate 6 below the first rack 603 reset downward. At this time, the heat pack 9 supported on the heat preservation bottom plate 6 is separated from the bottom of the battery pack shell 1, and the heat pack 9 warms the internal space of the heating shell 3.

[0038] Specific use, when the lithium battery pack for electric tools is in a low temperature or even extremely cold temperature working environment, the battery pack shell 1 can be sleeved in the heating shell 3, and a plurality of heating bags 9 are inserted into the bottom of the battery pack shell 1 after the rotating cover 4 is rotated and opened. When the electric tool is not inserted into the plug-in part 2, the heating bag 9 can be used to preheat the lithium battery pack in the heating shell 3, facilitating subsequent use, and at the same time, the charger can be inserted into the charging port 101 from the through slot 301 to avoid the lithium battery pack from being unable to charge and discharge due to extremely cold temperature. When low-temperature operation is needed, the electric tool is inserted into the plug-in slot 201, the lower second gear rack 604 and the first gear rack 603 are driven to move relatively by the pressing plate 8, the heat preservation bottom plate 6 is lifted, and the heating bag 9 on the heat preservation bottom plate 6 is attached to the bottom of the battery pack shell 1, so that heat is concentrated and transmitted to the bottom of the battery pack shell 1, facilitating low-temperature operation of the electric tool. After the electric tool is pulled out, the elastic assembly in the heating shell 3 drives the heat preservation bottom plate 6 to move downward, so that the heating bag 9 is separated from the bottom of the battery pack shell 1, and the battery pack shell 1 in the heating shell 3 is continuously warmed, thereby avoiding damage to the lithium battery caused by long-term concentrated heating.

[0039] Compared with the prior art, the utility model has the beneficial effects that the heating shell with gear assembly and heating material is installed outside the lithium battery pack, the lithium battery is heated by being attached after the electric tool is inserted, and the lithium battery is separated from the attachment and the inside of the shell is kept warm after the electric tool is pulled out, so that the lithium battery pack for electric tools can still work normally in extremely cold environment

[0040] For those skilled in the art, it is obvious that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0041] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A lithium battery pack for power tools, comprising a battery pack case and an insertion portion, characterized by, The battery package shell is sleeved with a heating shell outside, the bottom of the heating shell is provided with a heat preservation bottom plate, the heat preservation bottom plate is placed with a heating material, the heat preservation bottom plate is connected with a first connecting block, the first connecting block is provided with a rack assembly connected with the first connecting block, the middle of the rack assembly is provided with a gear assembly matched with the rack assembly, the side of the rack assembly away from the first connecting block is connected with a second connecting block, the lower end surface of the second connecting block is connected with an elastic assembly, the upper end surface of the second connecting block is connected with a pressing plate, and the heating shell is provided with a movement groove matched with the pressing plate.

2. The lithium battery pack for power tools according to claim 1, wherein The rack assembly includes a first rack assembly and a second rack assembly, the first rack assembly includes a first stabilizing strip and a first rack, the first stabilizing strip and the first rack are fixedly connected with the first connecting block, and the second rack assembly includes a second rack and a second stabilizing strip.

3. The lithium battery pack for power tools according to claim 2, wherein The gear assembly is installed between the first rack and the second rack, the gear assembly includes a gear and a fixed shaft, the gear is matched with the first rack and the second rack, and the fixed shaft is fixedly connected inside the heating shell.

4. The lithium battery pack for power tools according to claim 2, wherein The second stabilizing strip is fixedly connected with a connecting plate below, and the connecting plate is installed with a spring at the lower end surface.

5. The lithium battery pack for power tools according to claim 4, wherein The both ends of the spring are fixedly connected with the lower end surface of the connecting plate and the inner bottom of the heating shell respectively, and the spring is a compression spring.

6. The lithium battery pack for power tools according to claim 1, wherein A pair of rotating parts are installed on the heating shell, a rotating part is installed on the rotating cover between the pair of rotating parts, a rotating shaft is installed on the rotating part, and the rotating shaft penetrates through the battery package shell and the rotating cover and is matched with the rotating part on the battery package shell and the rotating cover.

7. The lithium battery pack for power tools according to claim 6, wherein A first magnetic block is installed on the heating shell, and a second magnetic block matched with the first magnetic block is installed on the rotating cover.

8. The lithium battery pack for power tools according to claim 1, wherein A charging port is arranged on the battery package shell, and a through slot matched with the charging port is formed on the heating shell.

9. The lithium battery pack for power tools according to claim 1, wherein A pair of heat preservation side plates are installed inside the battery package shell, and the distance from the pair of heat preservation side plates to the inner wall of the battery package shell is matched with the width of the first stabilizing strip, the first rack, the second rack and the second stabilizing strip.

10. The lithium battery pack for power tools according to claim 9, wherein A plurality of supporting plates are arranged on the pair of heat preservation side plates, and the upper end surface of the supporting plate is matched with the lower end surface of the battery package shell.

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