A protection device for a new energy lithium battery pack for heat dissipation and temperature reduction

Abstract

The present invention relates to the technical field of cooling of new energy battery packs, and discloses a protection device for a new energy lithium battery pack for heat dissipation and cooling, including a battery pack assembly. A cooling assembly is fixedly installed at the bottom end of the battery pack assembly, and a buffer protection assembly is fixedly installed on the outside of the battery pack assembly. The battery pack assembly includes a battery installation bottom plate. A connecting plate is fixedly installed on the front upper surface of the battery installation bottom plate. An end groove is formed in the connecting plate. A wire collecting assembly is fixedly installed on the connecting plate. A wire collecting port is provided on the wire collecting assembly, and the wire collecting port is aligned and installed with the end groove. A uniformly distributed and serially connected lithium battery pack is fixedly installed on the upper surface of the battery installation bottom plate. A cooling cover plate is fixedly installed on the lithium battery pack. An inner cavity of the plate is formed in the cooling cover plate. A sealing strip is fixedly installed at the end of the cooling cover plate. The device has the function of cooling and dissipating heat for the new energy lithium battery pack, and realizes the buffer protection function for the battery pack.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling the temperature of a new energy battery pack, and more specifically to a new energy lithium battery pack protection device for heat dissipation and cooling. Background Art

[0002] In pure electric vehicles equipped with only lithium batteries, lithium batteries are the only power source for the vehicle drive system; in hybrid vehicles equipped with traditional engines (or fuel cells) and lithium batteries, lithium batteries can be both the main power source and the auxiliary power source for the vehicle drive system. When the vehicle is at low speed and starting, the lithium battery is the main power source for the vehicle drive system; when accelerating at full load, the lithium battery is an auxiliary power source; when driving normally or decelerating or braking, the main function of the lithium battery is to store energy.

[0003] The battery pack of an electric vehicle is composed of multiple batteries stacked in series. A typical battery pack consists of ninety-six batteries. Taking a 4.2V lithium battery as an example, the car power system regards the battery pack as a single high-voltage battery, charging and discharging the entire battery pack each time. Such a battery pack can generate a total voltage of more than four hundred volts. The battery pack will generate a lot of heat during operation. If the heat cannot be dissipated in time, it will cause the battery temperature to rise, thereby affecting the performance, life and even safety of the battery. Therefore, the cooling and heat dissipation system is crucial for new energy battery packs. The cooling method under the existing technology is to configure a cooling fan at one end of the battery pack and set a vent at the other end to use air flow to take away the heat generated by the battery cell when it is working. However, in actual use, the new energy lithium battery pack under the existing technology still has the following shortcomings;

[0004] First, the new energy lithium battery pack under the existing technology will generate high temperature under the continuous discharge and charging working cycle. The battery pack is usually installed on the chassis of the electric vehicle and uses a fan to dissipate heat. Due to the relatively closed location, if the temperature is not effectively controlled, the lithium battery is prone to thermal runaway, causing electric vehicle failure or even accidents. The existing technology does not have a device for efficiently dissipating heat and cooling the new energy lithium battery pack. Secondly, the new energy lithium battery pack under the existing technology is installed and fixed on the chassis of the electric vehicle. As the electric vehicle moves, if the new energy lithium battery pack at the chassis is not installed stably, it will cause a collision risk due to its movement inertia. The new energy lithium battery pack under the existing technology does not have a safe buffer device when installed.

[0005] Therefore, in order to solve the above problems, it is necessary to provide a new energy lithium battery pack protection device for heat dissipation and cooling. Summary of the invention

[0006] To overcome the above-mentioned defects of the prior art, the present invention provides a protection device for a new energy lithium battery pack for heat dissipation and temperature reduction to solve the problems existing in the above-mentioned background technology.

[0007] The present invention provides the following technical solutions: A protection device for a new energy lithium battery pack for heat dissipation and temperature reduction, including a battery pack assembly, a cooling assembly is fixedly installed at the bottom end of the battery pack assembly, and a buffer protection assembly is fixedly installed outside the battery pack assembly;

[0008] The battery pack assembly includes a battery installation bottom plate, a connecting plate is fixedly installed on the front upper surface of the battery installation bottom plate, an end groove is formed in the connecting plate, and a wire collecting assembly is fixedly installed. A wire collecting port is provided on the wire collecting assembly, and the wire collecting port is installed in alignment with the end groove. A uniformly distributed and serially connected lithium battery pack is fixedly installed on the upper surface of the battery installation bottom plate. A front vertical plate is fixedly installed on the front side of the bottom end of the battery installation bottom plate. A cooling cover plate is fixedly installed on the lithium battery pack. The cooling cover plate is provided with an inner cavity of the plate. A sealing strip is fixedly installed at the end of the cooling cover plate, and uniformly distributed plate holes are formed in the sealing strip.

[0009] Further, the cooling assembly includes a coolant box, the coolant box is fixedly installed at the front end of the battery installation bottom plate, a liquid delivery pump is arranged inside the coolant box, a liquid box plate is fixedly installed at the upper end, and the output end of the liquid box plate is fixedly connected to an infusion pipe. The pipe end of the infusion pipe is fixedly connected to a liquid collecting box. The liquid collecting box is fixedly connected with four uniformly distributed liquid dividing pipes. The pipe body of the liquid dividing pipe is fixedly connected with uniformly distributed pressure nozzles.

[0010] Further, an installation arc plate is fixedly installed on the bottom surface of the battery installation bottom plate, and four uniformly distributed pipe sleeves are fixedly installed on the installation arc plate. The liquid dividing pipes are respectively fixedly sleeved with the pipe sleeves, and the pipe ends of the liquid dividing pipes are fixedly connected with liquid outlet pipes.

[0011] Further, a rear vertical plate is fixedly installed at the rear side of the bottom end of the battery installation base plate. The pipe body of the liquid outlet pipe passes through the rear vertical plate and is fixedly connected to the plate holes respectively. Side vertical plates are fixedly installed on both sides of the bottom end of the battery installation base plate. A filter plate is fixedly installed at the bottom end of the side vertical plate. A bottom liquid box is fixedly installed at the bottom end of the filter plate. A return liquid pump is arranged inside the bottom liquid box. The output end of the return liquid pump is fixedly connected to a return liquid pipe. The pipe end of the return liquid pipe is fixedly connected to the coolant box. When the lithium battery pack generates high temperature and thermal runaway during discharging and charging activities, the delivery liquid pump starts to deliver the coolant stored in the coolant box to the liquid collection box through the liquid delivery pipe, and then through the liquid distribution pipe and the liquid outlet pipe to the inside of the cooling cover plate. The cooling cover plate is installed on the upper end of the lithium battery pack, and the cooling cover plate cools and dissipates heat from the upper end of the lithium battery pack. At the same time, when the cooling cover plate is filled with coolant, the coolant will be sprayed out from the pressure nozzle, thereby cooling and lowering the temperature of the bottom surface of the battery installation base plate. At the same time, the coolant also flushes the bottom surface of the battery installation base plate. The dust and impurities washed down will fall onto the upper side of the filter plate with the coolant and be intercepted under the filtering action of the filter plate. The filtered coolant will enter the bottom liquid box to be cooled again. After being cooled down, it will be re-delivered to the coolant box by the return liquid pump through the return liquid pipe for reuse.

[0012] Further, the buffer protection assembly includes protection plates, the number of which is two and they are symmetrically distributed at both side edges of the battery installation base plate. Telescopic plates are connected between the front and rear ends of the protection plates and the battery installation base plate.

[0013] Further, evenly distributed cylinder barrels are fixedly connected to the inner side of the protection plate. A piston shaft is movably sleeved inside the cylinder barrel. The end of the shaft body of the piston shaft is fixedly connected to the battery installation base plate. A spring is sleeved on the shaft body of the piston shaft. A damping small hole is opened at the piston of the piston shaft. Damping oil is filled inside the cylinder barrel. The battery installation base plate is installed at the bottom of the vehicle. When the vehicle makes the battery installation base plate generate inertial collision during movement, the piston shaft will make telescopic movement in the cylinder barrel. Under the action of the damping oil in the cylinder barrel, the telescopic movement of the piston shaft is buffered.

[0014] The technical effects and advantages of the present invention:

[0015] 1. The present invention is provided with a cooling component. When the lithium battery pack generates high temperature during discharging and charging activities and is about to undergo thermal runaway or has already undergone thermal runaway, the liquid delivery pump starts to deliver the coolant stored in the coolant box to the liquid collection box through the liquid delivery pipe, and then through the liquid distribution pipe and the liquid outlet pipe to the inside of the cooling cover plate. The cooling cover plate is installed at the upper end of the lithium battery pack, and the cooling cover plate cools and dissipates heat from the upper end of the lithium battery pack. At the same time, when the cooling cover plate is filled with coolant, the coolant will be sprayed outwards from the pressure nozzle, thereby cooling and lowering the temperature of the bottom surface of the battery mounting base plate. At the same time, the coolant also flushes the bottom surface of the battery mounting base plate. The dust and impurities washed down will fall above the filter plate with the coolant and be intercepted under the filtering action of the filter plate. The filtered coolant will enter the bottom liquid box to be cooled again, and after being cooled, it will be re-transported to the coolant box by the return liquid pump through the return liquid pipe for reuse. The above structure realizes the function of comprehensively cooling the upper and lower parts of the lithium battery pack by the device, and at the same time has a certain cleaning function.

[0016] 2. The present invention is provided with a buffer protection component. The battery mounting base plate is installed at the bottom of the vehicle. When the vehicle makes inertial collisions during movement, causing the battery mounting base plate to move, the piston shaft will perform telescopic movement in the cylinder. Under the action of the damping oil in the cylinder, the telescopic movement of the piston shaft is buffered, thereby providing buffer protection for the inertial collision of the battery on the mounting base plate and improving the safety performance of the device. Brief Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the battery pack component structure of the present invention.

[0019] Figure 3 It is a schematic diagram of the structure at the inner cavity of the plate of the present invention.

[0020] Figure 4 It is a schematic diagram of the cooling component structure of the present invention.

[0021] Figure 5 It is a schematic diagram of the structure at the filter plate of the present invention.

[0022] Figure 6 It is a schematic diagram of the structure at the liquid distribution pipe of the present invention.

[0023] Figure 7 It is a schematic diagram of the structure at the liquid outlet pipe of the present invention.

[0024] Figure 8 It is a schematic diagram of the buffer protection component structure of the present invention.

[0025] Figure 9 It is a schematic cross-sectional structure diagram of the buffer protection component of the present invention.

[0026] The reference numerals are: 1, battery pack assembly; 101, battery mounting base plate; 102, connecting plate; 103, end slot; 104, wire gathering assembly; 105, wire gathering port; 106, lithium battery pack; 107, cooling cover plate; 108, inner cavity of the plate; 109, sealing strip; 110, plate hole; 2, cooling assembly; 201, coolant box; 202, liquid delivery pump; 203, liquid box plate; 204, infusion tube; 205, front vertical plate; 206, liquid collecting box; 207, liquid distribution tube; 208, pressure nozzle; 209, mounting arc plate; 210, pipe sleeve; 211, liquid outlet tube; 212, rear vertical plate; 213, side vertical plate; 214, filter plate; 215, bottom liquid box; 216, return liquid pump; 217, return liquid tube; 3, buffer protection assembly; 301, protection plate; 302, telescopic plate; 303, cylinder; 304, piston shaft; 305, spring; 306, damping small hole. Detailed implementation manners

[0027] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. In addition, the forms of each structure described in the following implementation manners are only examples, and a new energy lithium battery pack protection device for heat dissipation and temperature reduction related to the present invention is not limited to the structures described in the following implementation manners. All other implementation manners obtained without creative efforts by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0028] Refer to Figure 1 , the present invention provides a new energy lithium battery pack protection device for heat dissipation and temperature reduction, including a battery pack assembly 1. A cooling assembly 2 is fixedly installed at the bottom end of the battery pack assembly 1, and a buffer protection assembly 3 is fixedly installed outside the battery pack assembly 1;

[0029] In this embodiment, the battery pack assembly 1 provides the main power source for an electric vehicle. The cooling assembly 2 is used to implement the cooling and heat dissipation function of the battery pack assembly 1, and the buffer protection assembly 3 is used to buffer and protect the battery pack assembly 1. The specific structures and working principles of the above components will be described in detail later.

[0030] Refer to Figure 2 and Figure 3, the battery pack assembly 1 includes a battery mounting base plate 101. A connecting plate 102 is fixedly installed on the upper surface of the front end of the battery mounting base plate 101. An end groove 103 is formed in the connecting plate 102. A wire collecting assembly 104 is fixedly installed on the connecting plate 102. A wire collecting port 105 is provided on the wire collecting assembly 104. The wire collecting port 105 is installed in alignment with the end groove 103. A lithium battery pack 106 that is evenly distributed and connected in series with each other is fixedly installed on the upper surface of the battery mounting base plate 101. A cooling cover plate 107 is fixedly installed on the lithium battery pack 106. An inner cavity 108 of the plate is formed in the cooling cover plate 107. A sealing strip 109 is fixedly installed at the end of the cooling cover plate 107. Uniformly distributed plate holes 110 are formed in the sealing strip 109;

[0031] In this embodiment, the lithium battery packs 106 are connected in series with each other and evenly installed on the battery mounting base plate 101, so as to provide power for the electric vehicle. Since the above structure is a conventional technical means known to those skilled in the art, the working principle and specific structure thereof will not be described in detail in this embodiment.

[0032] Refer to Figures 4 - 7 , the cooling assembly 2 includes a coolant box 201. The coolant box 201 is fixedly installed at the front end of the battery mounting base plate 101. A liquid delivery pump 202 is provided inside the coolant box 201. A liquid box plate 203 is fixedly installed at the upper end of the coolant box 201. The output end of the liquid box plate 203 is fixedly connected to an infusion tube 204. A front vertical plate 205 is fixedly installed at the front side of the bottom end of the battery mounting base plate 101. The pipe end of the infusion tube 204 is fixedly connected to a liquid collecting box 206. The liquid collecting box 206 is fixedly connected with four liquid distribution tubes 207 that are evenly distributed. Uniformly distributed pressure nozzles 208 are fixedly connected to the pipe bodies of the liquid distribution tubes 207. An installation arc plate 209 is fixedly installed on the bottom surface of the battery mounting base plate 101. Four pipe sleeves 210 that are evenly distributed are fixedly installed on the installation arc plate 209. The liquid distribution tubes 207 are fixedly sleeved with the pipe sleeves 210 respectively. The pipe ends of the liquid distribution tubes 207 are all fixedly connected to liquid outlet tubes 211. A rear vertical plate 212 is fixedly installed at the rear side of the bottom end of the battery mounting base plate 101. The pipe bodies of the liquid outlet tubes 211 pass through the rear vertical plate 212 and are respectively fixedly connected to the plate holes 110. Side vertical plates 213 are fixedly installed on both sides of the bottom end of the battery mounting base plate 101. A filter plate 214 is fixedly installed at the bottom end of the side vertical plate 213. A bottom liquid box 215 is fixedly installed at the bottom end of the filter plate 214. A return liquid pump 216 is provided inside the bottom liquid box 215. The output end of the return liquid pump 216 is fixedly connected to a return liquid tube 217. The pipe end of the return liquid tube 217 is fixedly connected to the coolant box 201;

[0033] In this embodiment, when the lithium battery pack 106 generates high temperature during discharging and charging activities, the liquid delivery pump 202 starts to pump the coolant stored in the coolant box 201 through the liquid delivery pipe 204 to the liquid collection box 206, and then through the liquid distribution pipe 207 and the liquid outlet pipe 211 to the inside of the cooling cover plate 107. The cooling cover plate 107 is installed at the upper end of the lithium battery pack 106, and the cooling cover plate 107 cools and dissipates heat from the upper end of the lithium battery pack 106. At the same time, when the cooling cover plate 107 is filled with coolant, the coolant will be sprayed out from the pressure nozzle 208, thereby cooling and lowering the temperature of the bottom surface of the battery installation bottom plate 101. At the same time, the coolant also flushes the bottom surface of the battery installation bottom plate 101. The dust and impurities washed down will fall above the filter plate 214 and be intercepted under the filtering action of the filter plate 214. The filtered coolant will enter the bottom liquid box 215 to be cooled again, and after being cooled, it will be re-pumped by the return liquid pump 216 through the return liquid pipe 217 to the coolant box 201 for reuse. The above structure realizes the function of comprehensively cooling the upper and lower parts of the lithium battery pack 106 by the device, and also has a certain cleaning function.

[0034] Refer to Figure 8 and Figure 9 As shown in, the buffer protection assembly 3 includes a protection plate 301. The number of the protection plates 301 is two and they are symmetrically distributed at both side edges of the battery installation bottom plate 101. Telescopic plates 302 are connected between the front and rear ends of the protection plate 301 and the battery installation bottom plate 101. A uniformly distributed column cylinder 303 is fixedly connected to the inner side of the protection plate 301. A piston shaft 304 is movably sleeved inside the column cylinder 303. The end of the shaft body of the piston shaft 304 is fixedly connected to the battery installation bottom plate 101. A spring 305 is sleeved on the shaft body of the piston shaft 304. A damping small hole 306 is opened at the piston of the piston shaft 304. Damping oil is filled inside the column cylinder 303;

[0035] In this embodiment, the battery installation bottom plate 101 is installed at the bottom of the vehicle. When the vehicle moves and causes the battery installation bottom plate 101 to have an inertial collision, the piston shaft 304 will make a telescopic movement in the column cylinder 303. Under the action of the damping oil in the column cylinder 303, the telescopic movement of the piston shaft 304 is buffered, thereby providing buffer protection for the inertial collision of the battery installation bottom plate 101 and improving the safety performance of the device.

[0036] Working principle of the present invention: When the lithium battery pack 106 generates high temperature during discharging and charging activities, the conveying liquid pump 202 starts to convey the coolant stored in the coolant box 201 to the liquid collecting box 206 through the liquid conveying pipe 204, and then through the liquid distribution pipe 207 and the liquid outlet pipe 211 to the inside of the cooling cover plate 107. The cooling cover plate 107 is installed at the upper end of the lithium battery pack 106, and the cooling cover plate 107 cools and dissipates heat from the upper end of the lithium battery pack 106. At the same time, when the cooling cover plate 107 is filled with coolant, the coolant will be sprayed out from the pressure nozzle 208, thereby cooling and lowering the temperature of the bottom surface of the battery mounting base plate 101. At the same time, the coolant also flushes the bottom surface of the battery mounting base plate 101. The dust and impurities washed down will fall above the filter plate 214 along with the coolant and be intercepted under the filtering action of the filter plate 214. The filtered coolant will enter the bottom liquid box 215 to be cooled again. After being cooled down, it will be re-conveyed to the coolant box 201 through the return liquid pump 216 and the return liquid pipe 217 for reuse. The above structure realizes the function of comprehensively cooling the upper and lower parts of the lithium battery pack 106, and also has a certain cleaning function. The battery mounting base plate 101 is installed at the bottom of the vehicle. When the vehicle is moving and the battery mounting base plate 101 generates an inertial collision, the piston shaft 304 will make a telescopic movement in the cylinder 303. Under the action of the damping oil in the cylinder 303, the telescopic movement of the piston shaft 304 is buffered, thereby providing buffer protection for the inertial collision of the battery mounting base plate 101 and improving the safety performance of the device.

[0037] Finally, several points should be noted: First, in the description of the present application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. It can be a mechanical connection or an electrical connection, or it can be the communication inside two components. It can be directly connected. "Up", "down", "left", "right", etc. are only used to represent the relative position relationship. When the absolute position of the object being described changes, the relative position relationship may change;

[0038] Second: In the drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments of the present disclosure are involved. Other structures can refer to the general design. Without conflict, the same embodiments and different embodiments of the present invention can be combined with each other;

[0039] Finally: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A protection device for a new energy lithium battery pack for heat dissipation and temperature reduction, characterized in that, It includes a battery pack assembly (1), a cooling assembly (2) is fixedly installed at the bottom end of the battery pack assembly (1), and a buffer protection assembly (3) is fixedly installed outside the battery pack assembly (1). The battery pack assembly (1) includes a battery installation bottom plate (101), a connecting plate (102) is fixedly installed on the upper surface of the front end of the battery installation bottom plate (101), an end groove (103) is formed in the connecting plate (102), a wire collecting assembly (104) is fixedly installed on the connecting plate (102), a wire collecting port (105) is provided on the wire collecting assembly (104), the wire collecting port (105) is installed in alignment with the end groove (103), a lithium battery pack (106) which is evenly distributed and connected in series is fixedly installed on the upper surface of the battery installation bottom plate (101), a cooling cover plate (107) is fixedly installed on the lithium battery pack (106), a plate inner cavity (108) is formed in the cooling cover plate (107), a sealing strip (109) is fixedly installed at the end of the cooling cover plate (107), and evenly distributed plate holes (110) are formed in the sealing strip (109). The cooling assembly (2) includes a coolant box (201), the coolant box (201) is fixedly installed at the front end of the battery installation bottom plate (101), a liquid delivery pump (202) is arranged inside the coolant box (201), a liquid box plate (203) is fixedly installed at the upper end of the coolant box (201), an infusion tube (204) is fixedly connected to the output end of the liquid box plate (203), a front vertical plate (205) is fixedly installed at the front side of the bottom end of the battery installation bottom plate (101), the pipeline end of the infusion tube (204) is fixedly connected to a liquid collecting box (206), the liquid collecting box (206) is fixedly connected with four evenly distributed liquid dividing tubes (207), pressure nozzles (208) which are evenly distributed are fixedly connected to the tube bodies of the liquid dividing tubes (207), an installation arc plate (209) is fixedly installed on the bottom surface of the battery installation bottom plate (101), four evenly distributed tube sleeves (210) are fixedly installed on the installation arc plate (209), the liquid dividing tubes (207) are fixedly sleeved with the tube sleeves (210) respectively, the pipeline ends of the liquid dividing tubes (207) are all fixedly connected with liquid outlet tubes (211), a rear vertical plate (212) is fixedly installed at the rear side of the bottom end of the battery installation bottom plate (101), the tube bodies of the liquid outlet tubes (211) pass through the rear vertical plate (212) and are respectively fixedly connected with the plate holes (110), side vertical plates (213) are fixedly installed on both sides of the bottom end of the battery installation bottom plate (101), a filter plate (214) is fixedly installed at the bottom end of the side vertical plates (213), a bottom liquid box (215) is fixedly installed at the bottom end of the filter plate (214), a return liquid pump (216) is arranged inside the bottom liquid box (215), the output end of the return liquid pump (216) is fixedly connected with a return liquid tube (217), and the pipeline end of the return liquid tube (217) is fixedly connected with the coolant box (201).

2. The protection device for a new energy lithium battery pack for heat dissipation and temperature reduction according to claim 1, wherein: The buffer protection component (3) includes a protection plate (301). The number of the protection plates (301) is two, and they are symmetrically distributed on both sides of the battery installation bottom plate (101). Telescopic plates (302) are connected between the front and rear ends of the protection plate (301) and the battery installation bottom plate (101).

3. The protection device for a new energy lithium battery pack for heat dissipation and temperature reduction according to claim 2, wherein: A uniformly distributed column cylinder (303) is fixedly connected to the inner side of the protection plate (301). A piston shaft (304) is movably sleeved inside the column cylinder (303). The end of the shaft body of the piston shaft (304) is fixedly connected to the battery installation bottom plate (101). A spring (305) is sleeved on the shaft body of the piston shaft (304). A damping small hole (306) is formed at the piston of the piston shaft (304). Damping oil is injected into the column cylinder (303).

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