Battery pack housing and battery pack

Abstract

The application discloses a battery pack shell and a battery pack, and relates to the technical field of electric tool battery packs. The battery pack shell comprises a lower shell and an upper shell which is detachably connected with the lower shell. The top of the upper shell is provided with a docking seat. The end of the docking seat is provided with a plug-in groove which is electrically connected with the main body of the equipment. The side of the docking seat is provided with a guide groove. The end of the guide groove is slidably penetrated by a sliding rod. The outer end of the sliding rod is provided with a push plate. The outer part of the sliding rod is sleeved with a return spring. The inner end of the sliding rod is provided with a supporting rod. The supporting rod is provided with a limiting rod through a supporting plate. The upper shell is provided with a clamping assembly. The clamping assembly comprises a matching groove which is arranged on the top of the docking seat. The matching groove is gap-fit with a clamping seat of a wedge structure. The application overcomes the problem that the conductive terminal is easily short-circuited and has poor contact due to long-term exposure. The application solves the contradiction between dust prevention during the working of the battery pack, heat dissipation during charging and the easy blocking of the filter screen. In addition, the application can automatically cut off the power supply and eject the equipment before the thermal runaway of the battery cell.

Description

Technical Field

[0001] This invention relates to the field of power tool battery pack technology, specifically to a battery pack housing and a battery pack. Background Technology

[0002] Power tools are widely used in construction, manufacturing, and daily maintenance. As the power source for cordless power tools, the design of the battery pack's casing structure directly affects the battery pack's lifespan, ease of operation, and safety. Existing power tool battery packs are usually connected to the main body of the equipment through slide rails and mechanical latching mechanisms.

[0003] Chinese Patent Application No. 2025115818406 discloses a battery pack and power tool assembly. The battery pack is connected to the power tool and configured to supply power to the power tool. The battery pack includes a housing, a cell assembly installed in the housing, and a terminal assembly that outputs power from the cell assembly. The power tool includes a tool terminal electrically connected to the terminal assembly. The transformer assembly includes a movable element. The housing has a through opening. The power tool includes a contact portion corresponding to the movable element. The movable element is configured to contact the contact portion through the opening, and the contact portion drives the movable element to move, thereby switching the battery pack between high voltage and low voltage. When the battery pack is installed on the power tool, the contact portion first contacts the movable element and drives the movable element to move. Then, the tool terminal contacts the terminal assembly and achieves electrical conduction with the terminal assembly. However, when existing battery packs are idle, in transit, or not docked, the connector slots and internal conductive terminals are often directly exposed, making them susceptible to dust and moisture accumulation. They are also prone to contact with conductive materials, which can cause short circuits in the cells. At the same time, the conductive parts are prone to oxide layers or dirt adhesion, leading to poor contact and making it difficult to ensure power supply stability.

[0004] Furthermore, the working environment of power tools is usually accompanied by a large amount of dust. If the battery pack casing has normally open heat dissipation holes, dust can easily enter the inside and damage the battery cells during operation. If a fully enclosed structure is used, the heat generated inside cannot be effectively dissipated when the battery pack is disconnected from the device for charging. Although some products are equipped with dust filters, the filter holes are easily clogged by dust after long-term use, making them difficult to clean and seriously affecting heat dissipation efficiency. In addition, when power tools are operated under high load for a long time or when the battery cells experience a short circuit, the internal temperature will rise sharply. Since the existing battery packs are still in a locked state under abnormally high temperatures, it is impossible to determine whether the battery is in a state of thermal runaway, which can easily lead to safety accidents. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a battery pack shell and battery pack, which not only overcomes the problems of short circuit and poor contact caused by long-term exposure of conductive terminals, and solves the contradiction between dust prevention during battery pack operation, heat dissipation during charging and easy clogging of the filter, but also can automatically cut off the power supply and eject the device before the battery cell thermal runaway occurs, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a battery pack housing and a battery pack, comprising a lower housing and an upper housing detachably connected to the lower housing, wherein the top of the upper housing is provided with a docking seat, the end of the docking seat is provided with a plug-in groove electrically connected to the main body of the device, the side of the docking seat is provided with a guide groove, the end of the guide groove is slidably penetrated by a slide rod, the outer end of the slide rod is provided with a push plate, and a return spring is sleeved on the outside of the slide rod; The inner end of the slide bar is provided with a support rod, and a limiting rod is provided on the support rod through a support plate; The upper housing is provided with a locking assembly, the locking assembly comprising: A mating groove is provided on the top of the docking seat, and a wedge-shaped card seat is fitted inside the mating groove with a clearance. A pressing plate is movably provided at the end of the upper shell. It also includes a U-shaped seat at the bottom of the card holder, which corresponds to and cooperates with the limiting rod; A heat dissipation assembly is provided on the side of the upper housing, the heat dissipation assembly comprising: Heat dissipation grooves are provided on the side of the docking seat; It also includes a sliding groove and a transmission groove. The sliding groove is opened on the side of the docking seat, and a sliding plate that penetrates the heat dissipation groove is slidably fitted at the end of the sliding groove. The transmission groove is opened at the bottom of the sliding groove, and a connecting rod is slidably fitted inside the transmission groove. The two ends of the connecting rod are fixedly connected to the sliding plate and the push plate, respectively. The upper housing is provided with a protective component in the middle to protect the plug slot.

[0007] In one embodiment, a conductive part is provided in the insertion slot; The end of the slide bar extends into the interior of the upper housing.

[0008] In one embodiment, the engaging assembly further includes a guide cylinder and a pressure rod. The guide cylinder is located at the bottom of the pressing plate, and the pressure rod is slidably fitted inside the guide cylinder. The pressure rod is located inside the lower housing, and a connecting spring is provided between the guide cylinder and the pressure rod. The two ends of the connecting spring are fixedly connected to the guide cylinder and the pressure rod, respectively. The pressing plate and the card holder are integrally connected inside the upper housing, and the connecting spring is a memory spring.

[0009] In one embodiment, the inner end of the heat dissipation groove is provided with a heat dissipation hole that communicates with the interior of the docking seat, and the outer end of the heat dissipation groove is provided with a filter plate.

[0010] In one embodiment, the protective component includes a top groove, which is formed on the top of the docking seat. A top baffle is slidably passed through the end of the top groove. A side baffle is provided on the bottom side of the end of the top baffle. A sliding seat is provided at the outer end of the top baffle. Elastic members are symmetrically provided between the sliding seat and the end of the top groove.

[0011] In one embodiment, the top baffle extends into the interior of the insertion slot and is the same width as the insertion slot, the two sides of the side baffle are in contact with the conductive part in the insertion slot, the height of the slide does not exceed the depth of the top slot, and the elastic element is a spring sheet.

[0012] In one embodiment, the heat dissipation assembly further includes vents, which are formed at the top of the heat dissipation groove; The protective assembly also includes a telescopic bladder, which is symmetrically arranged on both sides of the top groove. The telescopic end of the telescopic bladder is fixedly connected to the elastic element, and the fixed end of the telescopic bladder is connected to the air hole through an air tube embedded in the docking seat.

[0013] On the other hand, the present invention also provides a battery pack, including the battery pack housing described above, and further including a cell holder disposed inside the lower housing, wherein a cell module is disposed inside the cell holder, and the cell module is electrically connected to a conductive part in a plug-in slot to supply power to the main body of the device.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. During the docking process between the battery pack and the main body of the equipment, the guide bar slides in along the guide groove and pushes the push plate and slide rod inward. The limiting rod moves with the slide rod and presses down on the U-shaped seat end slope to make it retract into the mating groove. After docking, the locking seat springs up under the action of the connecting spring and locks into the equipment slot, achieving a stable lock. During disassembly, lightly pressing the pressing plate will allow the locking seat to disengage from the slot and the battery pack to be pulled out. Heavy pressure will release the limiting and allow the return spring to push it out, improving operational efficiency.

[0015] 2. When the main body of the battery pack docking equipment is in operation, the push plate drives the sliding plate through the connecting rod to close the heat dissipation slot, preventing dust generated during equipment operation from entering the housing through the heat dissipation holes. After the battery pack is detached from the equipment, the sliding plate returns synchronously with the push plate to reopen the heat dissipation holes. The heat generated by the battery cells during charging can circulate and exchange heat with the outside through the heat dissipation holes. Combined with the filter plate to block external impurities, it can take into account both dust prevention during operation and heat dissipation during charging.

[0016] 3. When the battery pack is idle, the elastic element supports the top baffle and side baffle through the sliding block, forming a closed barrier on the top and side ports of the insertion slot to prevent dust, moisture and conductive foreign objects from entering and causing short circuits. During insertion and removal, the side baffle slides along the surface of the conductive part, which can scrape off oxides and attachments on the surface of the conductive part. It can also actively give way when docking and actively reset after disengagement, effectively ensuring the stability of electrical connection.

[0017] 4. When the sliding block reciprocates in the docking state, the elastic element repeatedly bends and squeezes the telescopic bladder. The airflow generated by the telescopic bladder rushes into the heat dissipation groove through the air pipe and air hole, blowing away the powder and impurities accumulated on the surface of the filter plate and inside the filter hole in the opposite direction, ensuring smooth heat dissipation path and ensuring heat dissipation efficiency during charging.

[0018] 5. When the battery cell abnormally heats up to the preset temperature, the connecting spring made of shape memory alloy undergoes a phase change and actively contracts, pulling the card holder down to disengage from the equipment slot. Simultaneously, it drives the U-shaped seat to move down to release the constraint on the limit rod. The reset spring releases its elastic force to push the push plate to forcefully eject the battery pack, cut off the power supply, and open the heat dissipation holes. This can effectively curb the risk of thermal runaway and improve the safety of use. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention from another angle; Figure 3 This is a schematic cross-sectional view of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 This is a schematic diagram of a partial internal structure of the present invention; Figure 6 This is a partial cross-sectional view of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point B; Figure 8 This is a partial structural diagram of the present invention.

[0020] In the diagram: 1. Lower housing; 101. Cell holder; 102. Cell module; 2. Upper housing; 201. Connecting seat; 202. Insertion slot; 203. Guide slot; 204. Slide rod; 205. Push plate; 206. Return spring; 207. Support rod; 208. Support plate; 209. Limiting rod; 3. Engaging assembly; 301. Mating groove; 302. Card holder; 303. Pressing plate; 304. Guide cylinder; 305. 1. Connecting spring; 306. Pressure rod; 307. U-shaped seat; 4. Heat dissipation assembly; 401. Heat dissipation groove; 402. Heat dissipation hole; 403. Filter plate; 404. Slide groove; 405. Sliding plate; 406. Transmission groove; 407. Connecting rod; 408. Air hole; 5. Protective assembly; 501. Top groove; 502. Top baffle; 503. Side baffle; 504. Slide seat; 505. Elastic element; 506. Telescopic bladder. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1 Please see Figure 1-8 This embodiment provides a technical solution: a battery pack housing, including a lower housing 1 and an upper housing 2 detachably connected to the lower housing 1. The top of the upper housing 2 is provided with a docking seat 201, and the end of the docking seat 201 is provided with a plug-in groove 202 electrically connected to the main body of the device. The plug-in groove 202 is provided with a conductive part.

[0023] The upper housing 2 and the lower housing 1 are detachably connected by screws. The docking seat 201 is used to install and dock the battery pack housing with the main body of the equipment. The insertion slot 202 is used to insert into the conductor on the main body of the equipment, so that electrical energy is supplied into the main body of the equipment through the contact between the conductive part and the conductor.

[0024] The side of the docking seat 201 is provided with a guide groove 203, and a slide rod 204 slides through the end of the guide groove 203. The end of the slide rod 204 extends into the interior of the upper housing 2. A push plate 205 is provided at the outer end of the slide rod 204, and a return spring 206 is sleeved on the outside of the slide rod 204.

[0025] The guide groove 203 is used to slide and engage with the guide bar at the docking position on the main body of the equipment to complete the initial docking of the docking seat 201 with the main body of the equipment. During the docking process, the guide bar will push the slide bar 204 in the guide groove 203 to slide into the upper housing 2, and the return spring 206 will be compressed.

[0026] The inner end of the slide bar 204 is provided with a support rod 207, and a limiting rod 209 is provided on the support rod 207 via a support plate 208.

[0027] When the slide bar 204 is pushed and slids, it causes the support bar 207 and the limit bar 209 to move and move closer to the U-shaped seat 307.

[0028] The upper housing 2 is provided with a locking assembly 3. The locking assembly 3 includes a mating groove 301 opened on the top of the docking seat 201. A wedge-shaped locking seat 302 is fitted in the mating groove 301 with a clearance. A pressing plate 303 is movably provided at the end of the upper housing 2. The pressing plate 303 and the locking seat 302 are integrally connected inside the upper housing 2. It also includes a guide cylinder 304 and a pressure rod 306. The guide cylinder 304 is located at the bottom of the pressing plate 303. The pressure rod 306 is slidably fitted inside the guide cylinder 304. The pressure rod 306 is located inside the lower housing 1. A connecting spring 305 is provided between the guide cylinder 304 and the pressure rod 306. The two ends of the connecting spring 305 are fixedly connected to the guide cylinder 304 and the pressure rod 306, respectively.

[0029] By applying downward pressure to the pressing plate 303, the card holder 302 can be driven to move downward. At the same time, the guide cylinder 304 moves downward along the pressure rod 306, and the connecting spring 305 is compressed. There is a clearance fit between the guide cylinder 304 and the pressure rod 306.

[0030] The engaging assembly 3 also includes a U-shaped seat 307 located at the bottom of the seat 302. The U-shaped seat 307 is engaged with the limiting rod 209. The end of the U-shaped seat 307 near the limiting rod 209 is provided with an inclined surface.

[0031] During the docking process between the main body of the equipment and the docking seat 201, the push plate 205 is pushed first. As the push feeds, when the limit rod 209 passes the inclined surface at the end of the U-shaped seat 307, it presses down on the U-shaped seat 307 and drives the card seat 302 to move downward. The connecting spring 305 is compressed. While the card seat 302 is fully inserted into the mating groove 301, the card groove on the main body corresponds to the position of the card seat 302. When the limit rod 209 has completely passed the inclined surface at the end of the U-shaped seat 307, the connecting spring 305 extends and resets, driving the card seat 302 to extend upward and reset, and engage with the card groove on the main body. At the same time, the limit rod 209 is inserted into the U-shaped seat 307, thus completing the complete docking of the battery pack and the main body of the equipment.

[0032] The depth to which the card holder 302 is inserted into the card slot is less than the depth of the U-shaped seat 307. When the pressing plate 303 is pressed, the card holder 302 can be disengaged from the card slot by lightly pressing the pressing plate 303 downwards. When the pressing plate 303 is pressed hard, the limiting rod 209 can be disengaged from the U-shaped seat 307, thus releasing the limitation on the slide rod 204.

[0033] The upper housing 2 has a heat dissipation assembly 4 on its side. The heat dissipation assembly 4 includes a heat dissipation groove 401 opened on the side of the docking seat 201. The inner end of the heat dissipation groove 401 is provided with a heat dissipation hole 402 communicating with the inside of the docking seat 201. The outer end of the heat dissipation groove 401 is provided with a filter plate 403.

[0034] The heat dissipation hole 402 enables air circulation and exchange between the inside and outside of the battery pack housing to dissipate heat inside the battery pack housing during charging. The filter plate 403 is used to prevent external impurities from entering the heat dissipation groove 401 and to prevent them from entering the battery pack housing through the heat dissipation hole 402.

[0035] The heat dissipation assembly 4 also includes a sliding groove 404 and a transmission groove 406. The sliding groove 404 is opened on the side of the docking seat 201. The end of the sliding groove 404 is slidably fitted with a sliding plate 405 that passes through the heat dissipation groove 401. The transmission groove 406 is opened at the bottom of the sliding groove 404. A connecting rod 407 is slidably fitted in the transmission groove 406. The two ends of the connecting rod 407 are fixedly connected to the sliding plate 405 and the push plate 205, respectively.

[0036] As the pusher plate 205 is pushed, the sliding plate 405 is driven to slide through the connecting rod 407, which can close the heat dissipation slot 401 and thus seal the heat dissipation hole 402. After the pusher plate 205 is pushed to the predetermined position, the sliding plate 405 completely seals each heat dissipation slot 401, preventing the dust generated during the use of the main body of the equipment from entering the battery pack housing through the filter plate 403.

[0037] The present invention also discloses a battery pack, including the battery pack housing described above, and a cell holder 101 disposed inside the lower housing 1. A cell module 102 is disposed inside the cell holder 101, and the cell module 102 is electrically connected to the conductive part in the insertion slot 202 to supply power to the main body of the device.

[0038] When installing and connecting the battery pack to the main body of the equipment, the operator needs to hold the battery pack housing and align the docking seat 201 on the top of the upper housing 2 with the installation position of the main body of the equipment. The guide bar on the main body first slides and engages with the guide groove 203 on the side of the docking seat 201. As the push continues, the end of the guide bar will directly contact and press against the push plate 205. After the push plate 205 is subjected to force, it drives the slide rod 204 to slide into the interior of the upper housing 2 against the elastic force of the return spring 206. During the process of the slide rod 204 sliding inward, it simultaneously drives the support rod 207 and the limiting rod 209 to move. The limiting rod 209 approaches the U-shaped seat 307 and first contacts the inclined surface at the end of the U-shaped seat 307. Under the guidance of the inclined surface, the horizontal thrust of the limiting rod 209 is converted into a vertical downward pressure, forcing the U-shaped seat 307 to drive the card seat 302 to sink downward against the support force of the connecting spring 305, so that the card seat 302 gradually retracts into the mating groove 301.

[0039] When the battery pack is fully pushed into the docking position, the conductor of the main body of the device is accurately inserted into the insertion slot 202 and forms a stable contact with the conductive part inside the insertion slot 202, thereby realizing the normal power supply from the cell module 102 to the main body of the device. At the same time, the limit rod 209 passes over the end slope of the U-shaped seat 307 and falls into the groove of the U-shaped seat 307. At this time, the card seat 302 quickly bounces up and resets under the elastic restoring force of the connecting spring 305. The bounced card seat 302 then locks into the card slot on the main body of the device, completing the docking and locking of the battery pack shell and the main body of the device.

[0040] As the push plate 205 moves inward under force, the push plate 205 drives the sliding plate 405 to slide along the slide groove 404 via the connecting rod 407 along the transmission groove 406, thereby allowing the sliding plate 405 to pass through and seal the heat dissipation groove 401. During normal operation of the main body of the equipment, the sliding plate 405 completely seals each heat dissipation hole 402 to prevent the dust generated during equipment operation from entering the battery pack through the filter plate 403.

[0041] When it is necessary to remove the battery pack from the main body of the equipment, the operator only needs to apply downward pressure to the pressing plate 303. Since the depth of the card holder 302 into the card slot of the main body of the equipment is set to be less than the depth of the U-shaped seat 307, pressing the pressing plate 303 lightly will cause the card holder 302 to sink down and disengage from the card slot of the equipment, and the battery pack can be slid out horizontally.

[0042] After the battery pack is removed, since the U-shaped seat 307 still limits the limit rod 209, by pressing the pressing plate 303, the guide cylinder 304 moves downward along the pressure rod 306, further increasing the falling distance of the U-shaped seat 307, so that the limit rod 209 completely disengages from the U-shaped groove of the U-shaped seat 307, thereby releasing the limitation of the U-shaped seat 307 on the slide rod 204. Under the elastic reset action of the reset spring 206, the push plate 205 and the slide rod 204 quickly pop outward to reset.

[0043] As the slide bar 204 and push plate 205 reset outward, the sliding plate 405 also retracts to its initial position under the traction of the connecting rod 407, reopening the heat dissipation hole 402. When the battery pack is detached from the main body of the device and connected to the charging dock for charging, the high temperature generated by the cell module 102 can be smoothly exchanged with the external environment through the heat dissipation hole 402, and the filter plate 403 is used to prevent dust and prevent external impurities from entering the battery pack during the heat dissipation process.

[0044] It should be noted that the battery pack can also be quickly ejected and separated by applying heavy pressure to the pressing plate 303 once, and by utilizing the elastic reset of the push plate 205 and the slide bar 204 under the action of the reset spring 206.

[0045] Example 2 When the battery pack is idle, in transit, or not connected, the connector slot 202 and its internal conductive parts are often exposed. This not only makes it easy for dust and moisture to fall in, but also, if it accidentally comes into contact with conductive objects, it can easily cause dangerous accidents such as short circuits in the battery cells. At the same time, long-term exposure of the conductive parts can also easily lead to the formation of an oxide layer or the accumulation of dirt, resulting in poor contact when used again. Therefore, the following improvements are made to solve this problem: Please see Figure 4 The upper housing 2 has a protective component 5 in the middle. The protective component 5 includes a top groove 501, which is opened at the top of the docking seat 201. A top baffle 502 slides through the end of the top groove 501. The top baffle 502 extends into the interior of the insertion groove 202 and is the same width as the insertion groove 202. A side baffle 503 is provided on the bottom side of the end of the top baffle 502. The two sides of the side baffle 503 are in contact with the conductive part in the insertion groove 202. A slide 504 is provided at the outer end of the top baffle 502. The height of the slide 504 does not exceed the depth of the top groove 501. Elastic members 505 are symmetrically provided between the slide 504 and the end of the top groove 501. The elastic members 505 are spring sheets.

[0046] In the initial state, the elastic element 505 is in a normal extended state, and the elastic elements 505 on both sides are concave inward. The top baffle 502 is located inside the insertion groove 202 and seals the top of the insertion groove 202. The side baffle 503 is located at the end of the insertion groove 202 and seals the side port of the insertion groove 202. During the docking process between the docking seat 201 and the equipment body, the conductor on the equipment body docks with the insertion groove 202 and pushes the top baffle 502 and the side baffle 503 to slide to one side of the top groove 501. The slide seat 504 squeezes the elastic elements 505 on both sides for elastic compression. At the same time as the card seat 302 is inserted into the card slot, the top baffle 502 and the side baffle 503 slide to the innermost end of the insertion groove 202.

[0047] When the battery pack housing is removed from the main body of the equipment, the elastic element 505 can elastically reset, which can drive the top baffle 502 and the side baffle 503 to reset to the initial state, thereby achieving active sealing of the insertion slot 202.

[0048] When the battery pack is idle or not docked, the protective component 5 actively seals and protects the battery pack's connector slot 202. At this time, the elastic element 505 remains extended in its natural state, and the elastic elements 505 on both sides are concave in opposite directions. Under the elastic support of the elastic element 505, the top baffle 502 is located at the top of the connector slot 202, effectively sealing the top of the connector slot 202. At the same time, the side baffle 503 is located at the end of the connector slot 202, and its two sides are tightly fitted with the conductive parts inside the connector slot 202, thereby sealing the side ports of the connector slot 202 and effectively preventing external dust, moisture or conductive objects from entering the connector slot 202 and causing a short circuit and a dangerous accident.

[0049] When the operator docks the docking seat 201 with the main body of the equipment, the conductor of the main body of the equipment will be aligned and inserted into the insertion slot 202. As the main body of the equipment is pushed in, the inserted conductor will directly contact and push the side baffle 503 and the top baffle 502. Under this pushing force, the top baffle 502 and the side baffle 503 overcome the resistance of the elastic element 505 and slide inward into the top groove 501. During the sliding process, the slide seat 504 will slide synchronously and apply pressure to the symmetrically distributed elastic elements 505 on both sides, causing the concave spring sheet to further deform elastically.

[0050] As the docking process proceeds, when the card holder 302 finally snaps into the slot on the main body of the device, the conductor of the main body of the device is in complete contact with the conductive part inside the insertion slot 202. At this time, the top baffle 502 and the side baffle 503 are completely pushed to the innermost end of the insertion slot 202 under the pressure of the conductor, thereby freeing up the insertion space inside the insertion slot 202, while the slide 504 compresses the elastic element 505 and keeps it in an energy storage state.

[0051] When the battery pack casing is removed from the main body of the equipment after completing its work, the conductor gradually detaches from the plug slot 202 as it slides out. At this time, the pushing force on the top baffle 502 and the side baffle 503 gradually disappears, and the elastic element 505, which is in a compressed and energy-storing state, gradually resets. The rebound force generated by the reset acts on the slide block 504, thereby pushing the top baffle 502 and the side baffle 503 to slide and return to the initial closed state. This achieves active protection and sealing of the top and side ports of the plug slot 202, ensuring that the plug slot 202 is in a closed and safe state after the battery pack is removed. At the same time, the side baffle 503, by fitting against the conductive part, can remove oxides and adhesions generated on the conductive part by sliding outward, ensuring the stability of the electrical connection.

[0052] Example 3 Although the filter plate 403 can prevent dust from entering the battery pack, with prolonged use of the main body of the device, dust and debris easily adhere to and accumulate on the surface and inside the filter pores of the filter plate 403, causing blockage. This will prevent effective airflow through the heat dissipation holes 402 when the battery pack is disconnected from the device for charging, seriously affecting the heat dissipation efficiency of the cell module 102. To solve this problem, the following improvements are made: Please see Figure 3 , Figure 6 and Figure 8 The heat dissipation component 4 also includes vents 408, which are located on the top of the heat dissipation slot 401.

[0053] The protective component 5 also includes a telescopic bladder 506, which is symmetrically arranged on both sides of the top groove 501. The telescopic end of the telescopic bladder 506 is fixedly connected to the elastic element 505, and the fixed end of the telescopic bladder 506 is connected to the air hole 408 through an air tube embedded in the docking seat 201.

[0054] With the sliding plate 405 sealing the heat dissipation groove 401, the elastic elements 505 on both sides bend backwards to squeeze the telescopic bladders 506 on both sides respectively. The airflow generated by the compression of the telescopic bladders 506 is discharged into the heat dissipation groove 401 through the air pipe and air hole 408. Since the heat dissipation hole 402 is sealed at this time, the generated airflow can impact the filter plate 403 outwards, causing the powder and impurities attached to the filter plate 403 and the filter hole to be blown to the outside of the heat dissipation groove 401, thereby cleaning the filter plate 403.

[0055] During use, after the battery pack is detached from the main body of the device by lightly pressing the pressing plate 303, the air hole 408 is still closed by the sliding plate 405. Before charging the battery pack, if powder or impurities are found attached to the filter plate 403 or filter holes, the elastic element 505 is repeatedly bent elastically by reciprocating sliding block 504, causing the telescopic bladder 506 to repeatedly expand and contract. The resulting airflow repeatedly impacts the interior of the heat dissipation groove 401 through the air hole 408, which blows the powder or impurities attached to the filter plate 403 or filter holes outwards. After cleaning, pressing the pressing plate 303 will reset the sliding plate 405 by resetting the push plate 205, allowing the air hole 408 to open for normal heat dissipation.

[0056] It should be noted that, in order to prevent dust and impurities from being sucked into the air vent 408, an air intake one-way valve and an exhaust one-way valve can be installed on the telescopic bladder 506. The air intake one-way valve is located at the telescopic end of the telescopic bladder 506, and the exhaust one-way valve is located at the fixed end of the telescopic bladder 506 and connected to the air pipe, so as to realize one-way air intake and one-way exhaust, and prevent dust and impurities on the filter plate 403 from being sucked in.

[0057] Example 4 When power tools operate under high load or overload for extended periods, or when a short circuit occurs in the internal battery cell module 102, the internal temperature of the battery pack will rise rapidly. If the operator fails to notice this in time and stop using the tool, it can easily lead to thermal runaway of the battery, or even cause serious safety accidents such as fire or explosion. To solve this problem, the following improvements are made: The connecting spring 305 is a memory spring, which is made of shape memory alloy wire. After the temperature of the connecting spring 305 rises to a predetermined temperature value, it will actively contract and return to its original shape.

[0058] During use, when the battery pack operates under high load for a long time or when the internal cell module 102 experiences a short circuit or other abnormal fault, the temperature inside the battery pack casing will rise sharply and heat will accumulate, causing the connecting spring 305 to heat up. When the temperature of the connecting spring 305 rises and reaches the preset phase change temperature value of the shape memory alloy, it will cause the connecting spring 305 to actively contract. During the contraction of the connecting spring 305, it will directly pull the guide cylinder 304, causing the guide cylinder 304 to move downward along the pressure rod 306, thereby driving the pressing plate 303 and the card seat 302 to move downward synchronously. Under the pulling action, the card seat 302 is completely inserted into the mating groove 301 to disengage from the card slot of the main body of the equipment. At the same time, the U-shaped seat 307 at the bottom of the card seat 302 will also move downward, causing the limiting rod 209 inserted into the U-shaped seat 307 to disengage and lose its limiting position.

[0059] When the limit rod 209 is completely disengaged from the U-shaped seat 307, the return spring 206, which is in a compressed and stored state, quickly releases its elastic potential energy, pushing the slide rod 204 and the push plate 205 outwards rapidly. At this time, the reaction force of the push plate 205 on the docking position of the main body of the equipment causes the battery pack shell to be quickly and forcibly pushed out of the main body of the equipment, thereby cutting off the electrical connection between the conductive part in the insertion slot 202 and the main body of the equipment, terminating the operation of the battery pack. At the same time, the slide plate 405 retracts and resets, and opens the heat dissipation hole 402 to dissipate heat, preventing the battery pack from continuing to work at high temperatures and causing serious accidents, thus improving the safety of using power tools.

[0060] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A battery pack housing, comprising a lower housing (1) and an upper housing (2) detachably connected to the lower housing (1), characterized in that, The top of the upper housing (2) is provided with a docking seat (201), and the end of the docking seat (201) is provided with a plug-in groove (202) electrically connected to the main body of the equipment. The side of the docking seat (201) is provided with a guide groove (203), and a slide rod (204) slides through the end of the guide groove (203). The outer end of the slide rod (204) is provided with a push plate (205), and a return spring (206) is sleeved on the outside of the slide rod (204). The inner end of the slide bar (204) is provided with a support rod (207), and a limiting rod (209) is provided on the support rod (207) through a support plate (208). The upper housing (2) is provided with a locking assembly (3), the locking assembly (3) comprising: A mating groove (301) is provided on the top of the docking seat (201), and a wedge-shaped card seat (302) is fitted in the mating groove (301) with a gap. A pressing plate (303) is movably provided at the end of the upper shell (2). It also includes a U-shaped seat (307) located at the bottom of the card holder (302), the U-shaped seat (307) correspondingly cooperating with the limiting rod (209); The upper housing (2) has a heat dissipation assembly (4) on its side, the heat dissipation assembly (4) comprising: A heat dissipation groove (401) is provided on the side of the docking seat (201); It also includes a sliding groove (404) and a transmission groove (406). The sliding groove (404) is opened on the side of the docking seat (201). The end of the sliding groove (404) is slidably fitted with a sliding plate (405) that passes through the heat dissipation groove (401). The transmission groove (406) is opened at the bottom of the sliding groove (404). A connecting rod (407) is slidably fitted in the transmission groove (406). The two ends of the connecting rod (407) are fixedly connected to the sliding plate (405) and the push plate (205) respectively. The upper housing (2) is provided with a protective component (5) for protecting the plug slot (202) in the middle.

2. The battery pack housing according to claim 1, characterized in that: The insertion slot (202) is provided with a conductive part; The end of the slide bar (204) extends into the interior of the upper housing (2).

3. The battery pack housing according to claim 1, characterized in that: The engaging assembly (3) further includes a guide cylinder (304) and a pressure rod (306). The guide cylinder (304) is located at the bottom of the pressing plate (303). The pressure rod (306) is slidably fitted inside the guide cylinder (304). The pressure rod (306) is located inside the lower housing (1). A connecting spring (305) is provided between the guide cylinder (304) and the pressure rod (306). The two ends of the connecting spring (305) are fixedly connected to the guide cylinder (304) and the pressure rod (306) respectively. The pressing plate (303) and the card holder (302) are integrally connected inside the upper housing (2), and the connecting spring (305) is a memory spring.

4. The battery pack housing according to claim 1, characterized in that: The inner end of the heat dissipation groove (401) is provided with a heat dissipation hole (402) that communicates with the inside of the docking seat (201), and the outer end of the heat dissipation groove (401) is provided with a filter plate (403).

5. The battery pack housing according to claim 1, characterized in that: The protective component (5) includes a top groove (501), which is opened on the top of the docking seat (201). A top baffle (502) slides through the end of the top groove (501). A side baffle (503) is provided on the bottom side of the end of the top baffle (502). A slide (504) is provided on the outer end of the top baffle (502). Elastic elements (505) are symmetrically provided between the slide (504) and the end of the top groove (501).

6. The battery pack housing according to claim 5, characterized in that: The top baffle (502) extends into the interior of the insertion groove (202) and is the same width as the insertion groove (202). The two sides of the side baffle (503) are in contact with the conductive part in the insertion groove (202). The height of the slide (504) does not exceed the depth of the top groove (501). The elastic element (505) is a spring sheet.

7. The battery pack housing according to claim 5, characterized in that: The heat dissipation assembly (4) also includes vents (408), which are located at the top of the heat dissipation groove (401); The protective component (5) also includes a telescopic bladder (506), which is symmetrically arranged on both sides of the top groove (501). The telescopic end of the telescopic bladder (506) is fixedly connected to the elastic element (505), and the fixed end of the telescopic bladder (506) is connected to the air hole (408) through the air tube embedded in the docking seat (201).

8. A battery pack, comprising a battery pack housing as described in any one of claims 1-7, characterized in that: It also includes a battery cell holder (101) located inside the lower housing (1), wherein a battery cell module (102) is provided inside the battery cell holder (101), and the battery cell module (102) is electrically connected to the conductive part in the plug slot (202) to supply power to the main body of the device.

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