A novel battery pack and manufacturing method thereof

Abstract

The present invention discloses a novel battery pack and a manufacturing method thereof, which relates to the field of battery technology, including a shell, a battery module, wherein the battery module includes a first module and a second module; the manufacturing method of the battery pack includes material grinding, raw material premixing, filler, spray curing, strength test, tightness test and anti-fatigue test. The present invention can efficiently dissipate heat for the battery cell by configuring a heat dissipation gel to be directly combined with the battery cell, and at the same time, by utilizing the high water content of the heat dissipation gel, when the battery cell is about to explode due to thermal runaway, the heat is absorbed by evaporation of water, which has a certain inhibitory effect on the thermal runaway, and can provide a longer evacuation time for the personnel on site. By configuring a first insulating fixing component and a second insulating fixing component with buffer protection for the battery cell, the battery pack can adapt to a more complex environment, and even when the shell receives a certain impact, the integrity of the battery cell can still be guaranteed, reducing the probability of accidents caused by external force factors.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and in particular relates to a novel battery pack and a manufacturing method thereof. Background Art

[0002] A battery pack is a whole that packages a lithium-ion battery pack, a battery management system (BMS), and other necessary electrical components in a protective container. It is commonly used in electric vehicles and rechargeable battery systems to provide a power source and store energy. The main function of a battery pack is to store electrical energy and deliver it to an electric motor or other required equipment to drive the vehicle or power other devices.

[0003] The internal structure of a battery pack is generally compact, and the internal heat dissipation space is limited, especially for electric vehicles and other space-constrained applications. When charging and discharging, the battery cells will dissipate heat. If the heat cannot be dissipated in time, the battery pack will have the risk of overheating and explosion. Existing heat dissipation generally provides a heat dissipation device on the battery pack shell, such as air cooling, water cooling and other related heat dissipation devices. However, this heat dissipation method is not enough to dissipate heat in time when the battery cell generates a large amount of heat, and will trigger the thermal protection system to inhibit the charging and discharging of the battery pack and then cooperate with external heat dissipation to achieve thermal control of the battery pack. Currently, there is a method of dissipating heat for batteries through heat dissipation gel, specifically hydrogel. Hydrogel has the advantages of recyclability and low manufacturing cost. This heat dissipation method has better heat dissipation effect than the above heat dissipation method. The existing heat dissipation gel for battery heat dissipation is not enough to achieve a more efficient heat dissipation state relative to the heat generated by the battery cell.

[0004] Whether the battery pack is used in the field of electric vehicles, rechargeable battery systems or other related fields, the safety of the battery pack itself must be considered. The battery cells will be at risk of explosion when squeezed by external forces during a collision. In particular, the battery pack used in electric vehicles is extremely susceptible to damage and explosion when it is collided or the chassis is scratched and squeezed. Current technology makes it difficult to extend the period before the battery explodes, which is not enough to provide enough time for passengers in the car to escape. Summary of the invention

[0005] The purpose of the present invention is to provide a new battery pack and a manufacturing method thereof to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides the following scheme: The present invention provides a new type of battery pack, the battery pack is filled with heat dissipation gel, including a shell, the shell includes an upper shell and a lower shell, the top surface of the upper shell is provided with a filling port, a first power source and a second power source, the bottom edge of the upper shell extends downward with an inner edge, the bottom edge of the upper shell abuts with the top edge of the lower shell, the top edge of the lower shell extends upward with an outer edge, and the inner edge and the outer edge contact surface are slidably connected; battery modules are arranged inside the upper shell and the lower shell, the battery module is a first module or a second module, the first module or the second module abuts with the inside of the upper shell and the inside of the lower shell respectively; the first module includes a plurality of evenly arranged cylindrical batteries, the heat dissipation gel is in direct contact with the side of the cylindrical battery, and the cylindrical battery is mounted with a second module. An insulating fixing component, the first insulating fixing component is respectively in contact with the interior of the upper shell and the interior of the lower shell, the columnar batteries are evenly arranged in several layers inside the shell, at least two layers of columnar batteries are configured as a first battery group, and a hollow support plate is arranged between each group of the first battery groups; the second module includes a plurality of evenly arranged sheet batteries, the heat dissipation gel is in direct contact with the outer side of the sheet batteries, each of the sheet batteries is sleeved with a second insulating fixing component, the second insulating fixing component is respectively in contact with the interior of the upper shell and the interior of the lower shell, the sheet batteries are evenly arranged in several layers inside the shell, at least one layer of the sheet batteries is configured as a second battery group, the hollow support plate is arranged between each group of the second battery groups, and the hollow support plate is in contact with the interior of the upper shell and the interior of the lower shell.

[0007] Preferably, each group of the first insulating fixing components simultaneously fixes two of the cylindrical batteries in the vertical direction, the first insulating fixing components include a side fixing component and a middle fixing component, the side fixing component is located at the upper and lower ends of the two vertically arranged cylindrical batteries, the side fixing component includes two groups of side supports symmetrically arranged up and down, each group of side supports is slidably connected with a guard plate, a support shell is fixedly connected to a side of the guard plate close to the cylindrical battery, the support shell is fixedly connected to the cylindrical battery on a side away from the guard plate, and a wire opening is provided between the guard plate and the support shell; the middle fixing component Located between the two columnar batteries, the middle fixing assembly includes a plurality of middle supports, two guard plates and two support shells, the two guard plates are vertically arranged up and down, the upper guard plate is slidably connected to the upper part of the middle support, the side of the upper guard plate away from the middle support is fixedly connected to one of the support shells, the upper part of the support shell is fixedly connected to the bottom of the columnar battery, the lower guard plate is slidably connected to the lower part of the middle support, the side of the lower guard plate away from the middle support is fixedly connected to the other support shell, and the lower part of the support shell is fixedly connected to the top of the other columnar battery.

[0008] Preferably, the edge fixing assembly includes an edge block, a plurality of sliding limit grooves are opened on the end of the edge block close to the guard plate, the edge of the guard plate is slidably connected to the sliding limit grooves, the end of the edge block close to the sliding limit grooves is fixedly connected to a side plate, and the side plate is slidably connected to the guard plate.

[0009] Preferably, the middle fixing assembly comprises a middle block, the two ends of the middle block are respectively provided with the sliding limit grooves, and the two sides of the sliding limit grooves away from the middle block are respectively fixed with middle plates.

[0010] Preferably, the second insulating fixing component includes two symmetrically arranged double buffer plates and two limit bars, the two ends of the two limit bars are respectively slidably connected to the two double buffer plates, the two ends of the limit bars are fixed with energy absorption rings, the energy absorption rings are located in the double buffer plates, the two limit bars are clamped with the sheet batteries, and the double buffer plates are abutted against the interior of the upper shell and the interior of the lower shell.

[0011] Preferably, the bottom of the double buffer plate not close to the inner side of the bottom of the lower shell is fixedly connected to a first support, the bottom of the double buffer plate close to the inner side of the bottom of the lower shell is fixedly connected to a third support, and a second support is arranged above the third support.

[0012] Preferably, the double buffer plate is composed of two U-shaped elastic support plates, the ends of the two U-shaped elastic support plates form a certain space, the connection position between the end of the limit strip and the energy absorption ring is formed by the space formed by the two U-shaped elastic support plates, and the distance between the bottoms of the two U-shaped elastic support plates is greater than the distance between the tops.

[0013] The surfaces where the outer edge and the inner edge meet are both provided with saw teeth.

[0014] A novel battery pack manufacturing method comprises the following steps:

[0015] Material grinding;

[0016] Premixing of raw materials;

[0017] filler;

[0018] Spray curing;

[0019] Strength test;

[0020] Tightness test;

[0021] Fatigue resistance test.

[0022] The present invention discloses the following technical effects: after placing the battery cell in the battery pack and sealing the upper shell and the lower shell, the heat dissipation gel is injected into the shell through the filling port, so that the heat dissipation gel fills the gap inside the shell; the first power supply and the second power supply of the upper shell are the output / input of the power supply, and other sensors, controllers, detectors and other components for electric control are also built in / outside the shell. The inner edge of the upper shell extending downward and the outer edge of the lower shell extending downward can enhance the sealing and firmness of the shell. The battery module is abutted against the inside of the upper shell and the inside of the lower shell, so that the battery module has a certain anti-extrusion shrinkage activity space in the shell, thereby improving the overall safety performance of the battery pack. The battery module can be selected according to the shape of the battery cell; the first module It is used for cylindrical batteries, and the second module is used for sheet batteries; the first module can be used to set four layers of cylindrical batteries in the shell, the upper two layers and the lower two layers are respectively the first battery groups, and the hollow support plate (not shown in the figure) set between the two groups of first battery groups is used to support the first battery groups of the upper and lower layers. The hollow design reduces the weight of the battery pack while allowing the heat dissipation gel to flow fully in the shell. The first insulating fixing component set in the first module is used to separate the cylindrical battery from the heat dissipation gel to prevent the heat dissipation gel from directly contacting the electrodes of the cylindrical battery to cause a short circuit. The first insulating fixing component has a fixing effect and an impact buffering protection effect on the cylindrical battery. The first insulating fixing component allows each adjacent cylindrical battery to have There is a certain gap, which is used for the heat absorption of the heat dissipation gel and the contraction and expansion of the columnar battery during charging and discharging. The heat dissipation gel is in direct contact with the side of the columnar battery, which greatly improves the heat dissipation effect of the battery cell. The second module sets two layers of sheet batteries in the shell, and the upper and lower layers are respectively second battery groups. A hollow support plate (not shown in the figure) is also set between the two second battery groups to support the second battery groups in the upper and lower layers. The second insulating fixing component sleeved on each sheet battery is used for supporting and buffering the sheet battery. Each second insulating fixing component is abutted against the inside of the shell, and each adjacent second insulating fixing component is abutted. When the shell is squeezed from the outside, the second insulating fixing component can be a sheet. The battery provides deformation energy absorption, protects the sheet battery from being squeezed and deformed, and ensures the safety of the sheet battery; the present invention configures the heat dissipation gel to be directly combined with the battery cell, so as to efficiently dissipate the heat of the battery cell, and at the same time utilizes the high water content of the heat dissipation gel. When the battery cell is thermally runaway and about to explode, the heat is absorbed by evaporation of water, which has a certain inhibitory effect on the thermal runaway, and can provide a longer evacuation time for the personnel on site. By configuring the first insulating fixing component and the second insulating fixing component with buffering protection for the battery cell, the battery pack can adapt to more complex environments. Even if the shell receives a certain impact, the integrity of the battery cell can still be guaranteed, and the probability of accidents caused by external force factors in the battery cell is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0024] Figure 1 A schematic diagram of the present invention as a whole;

[0025] Figure 2 This is a schematic diagram of the housing of the present invention in an open state;

[0026] Figure 3 It is a schematic diagram of the connection between the inner edge and the outer edge of the present invention;

[0027] Figure 4 This is a schematic diagram of the first module of the present invention;

[0028] Figure 5 for Figure 4 A partial enlarged schematic diagram of part A;

[0029] Figure 6 It is a schematic diagram of combining a single group of first insulating fixing components and a cylindrical battery of the present invention;

[0030] Figure 7 is a schematic diagram of a support shell of the present invention;

[0031] Figure 8 It is a schematic diagram of the fixing assembly in the present invention;

[0032] Fig. 9 It is a schematic diagram of the edge fixing assembly of the present invention;

[0033] Fig.10 is a schematic diagram of the second module of the present invention;

[0034] Fig.11 Schematic diagram of the combination of a single set of second insulating fixing components and a sheet-shaped battery of the present invention Figure 1 ;

[0035] Fig.12 Schematic diagram of the combination of a single set of second insulating fixing components and a sheet-shaped battery of the present invention Figure 2 ;

[0036] Fig.13 The double buffer plate of the present invention is shown in FIG. Figure 1 ;

[0037] Fig.14 The double buffer plate of the present invention is shown in FIG. Figure 2 .

[0038] In the figure: 101, upper shell; 102, lower shell; 103, filling port; 104, first power supply; 105, second power supply; 106, inner edge; 107, outer edge; 200, first module; 201, cylindrical battery; 202, support shell; 203, wire port; 204, guard plate; 210, side support; 211, side block; 212, side plate; 220, middle support; 221, middle block; 222, sliding limit groove; 223, middle plate; 300, second module; 301, double buffer plate; 302, energy absorption ring; 303, limit strip; 304, sheet battery; 305, first support; 306, second support; 307, third support. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Reference Figure 1-Figure 14As shown, this embodiment provides a novel battery pack and a manufacturing method thereof, wherein the battery pack is filled with heat dissipation gel, and comprises a shell, wherein the shell comprises an upper shell 101 and a lower shell 102, wherein a filling port 103, a first power source 104, and a second power source 105 are arranged on the top surface of the upper shell 101, an inner edge 106 extends downward from the bottom edge of the upper shell 101, the bottom edge of the upper shell 101 abuts against the top edge of the lower shell 102, an outer edge 107 extends upward from the top edge of the lower shell 102, and the contact surfaces of the inner edge 106 and the outer edge 107 are slidably connected; a battery module is arranged inside the upper shell 101 and the lower shell 102, and the battery module is a first module 200 or a second module 300, and the first module 200 or the second module 300 abuts against the inside of the upper shell 101 and the inside of the lower shell 102 respectively; the first module 200 comprises a plurality of evenly arranged cylindrical batteries 201, and the heat dissipation gel is directly connected to the side of the cylindrical battery 201 The first insulating fixing component is installed on the cylindrical battery 201, and the first insulating fixing component is respectively abutted against the interior of the upper shell 101 and the interior of the lower shell 102. The cylindrical batteries 201 are evenly arranged in several layers inside the shell, and at least two layers of cylindrical batteries 201 are configured as a first battery group, and a hollow support plate is arranged between each group of first battery groups; the second module 300 includes a plurality of evenly arranged sheet batteries 304, and the heat dissipation gel is in direct contact with the outer side of the sheet battery 304. Each sheet battery 304 is sleeved with a second insulating fixing component, and the second insulating fixing component is respectively abutted against the interior of the upper shell 101 and the interior of the lower shell 102. The sheet batteries 304 are evenly arranged in several layers inside the shell, and at least one layer of sheet batteries 304 is configured as a second battery group. A hollow support plate is arranged between each group of second battery groups, and the hollow support plate is abutted against the interior of the upper shell 101 and the interior of the lower shell 102.

[0042] The battery cell is placed in the battery pack. After the upper shell 101 and the lower shell 102 are sealed, the heat dissipation gel is injected into the shell through the filling port 103 to fill the gap inside the shell with the heat dissipation gel. The heat dissipation gel can be a hydrogel, a thermally conductive gel, a cold gel, etc., which can dissipate heat from the battery. The heat dissipation gel mentioned in this embodiment is a hydrogel; the first power supply 104 and the second power supply 105 of the upper shell 101 are the output / input of the power supply. At the same time, other sensors, controllers, detectors, etc. for electronic control are built in / outside the shell. The inner edge 106 extending downward from the upper shell 101 and the outer edge 107 extending from the lower shell 102 can enhance the sealing of the shell. The battery module is in contact with the interior of the upper shell 101 and the interior of the lower shell 102, so that the battery module has a certain anti-extrusion shrinkage activity space in the shell, which improves the overall safety performance of the battery pack. The battery module can be selected according to the shape of the battery core; the first module 200 is used for the cylindrical battery 201, and the second module 300 is used for the sheet battery 304; wherein the first module 200 can be provided with four layers of cylindrical batteries 201 in the shell, the upper two layers and the lower two layers are respectively the first battery groups, and the hollow support plate (not shown in the figure) arranged between the two groups of first battery groups is used to support the upper and lower layers of the first battery groups, and the hollow design reduces the weight of the battery pack At the same time, the heat dissipation gel can fully flow in the shell. The first insulating fixing component set in the first module 200 is used to separate the columnar battery 201 from the heat dissipation gel to prevent the heat dissipation gel from directly contacting the electrode of the columnar battery 201 to cause a short circuit. The first insulating fixing component has a fixing effect and an impact buffering protection effect on the columnar battery 201. The first insulating fixing component allows each adjacent columnar battery 201 to have a certain gap, which is used for the heat absorption of the heat dissipation gel and the contraction and expansion of the columnar battery 201 during charging and discharging. The heat dissipation gel directly contacts the side of the columnar battery 201, which greatly improves the heat dissipation effect of the battery cell. The second module 30 Two layers of sheet batteries 304 are arranged in the shell, and the upper and lower layers are second battery groups respectively. A hollow support plate (not shown in the figure) is also arranged between the two second battery groups to support the second battery groups in the upper and lower layers. The second insulating fixing component sleeved on each sheet battery 304 is used to support and buffer the sheet battery 304. Each second insulating fixing component is abutted against the inside of the shell, and each adjacent second insulating fixing component is abutted. When the shell is squeezed from the outside, the second insulating fixing component can provide deformation energy absorption for the sheet battery 304, protect the sheet battery 304 from being squeezed and deformed, and ensure the safety of the sheet battery 304.

[0043] Further optimized solution, each group of first insulating fixing components simultaneously fixes two cylindrical batteries 201 in the vertical direction, the first insulating fixing components include a side fixing component and a middle fixing component, the side fixing component is located at the upper and lower ends of the two vertically arranged cylindrical batteries 201, the side fixing component includes two groups of side supports 210 symmetrically arranged up and down, and each group of side supports 210 is slidably connected with a guard plate 204, a support shell 202 is fixedly connected to a side of the guard plate 204 close to the cylindrical battery 201, and a side of the support shell 202 away from the guard plate 204 is fixedly connected to the cylindrical battery 201, and a wire port 203 is set between the guard plate 204 and the support shell 202; the middle fixing component is located at the upper and lower ends of the two vertically arranged cylindrical batteries 201, and the side fixing component includes two groups of side supports 210 symmetrically arranged up and down, and a guard plate 204 is slidably connected between each group of side supports 210, and a support shell 202 is fixedly connected to a side of the guard plate 204 close to the cylindrical battery 201, and a side of the support shell 202 away from the guard plate 204 is fixedly connected to the cylindrical battery 201, and a wire port 203 is set between the guard plate 204 and the support shell 202; Between the two cylindrical batteries 201, the middle fixed component includes a plurality of middle supports 220, two guard plates 204 and two support shells 202. The two guard plates 204 are vertically arranged up and down. The upper guard plate 204 is slidably connected to the upper part of the middle support 220, and the side of the upper guard plate 204 away from the middle support 220 is fixed to one of the support shells 202. The top of the support shell 202 is fixed to the bottom of the cylindrical battery 201. The lower guard plate 204 is slidably connected to the lower part of the middle support 220, and the side of the lower guard plate 204 away from the middle support 220 is fixed to the other support shell 202. The bottom of the support shell 202 is fixed to the top of another cylindrical battery 201.

[0044] The side fixing components are composed of two parts, and are designed to be eight in total, of which four are located at the four corners of the top of the cylindrical battery 201, and the other four are located at the four corners of the bottom of the cylindrical battery 201. Each adjacent cylindrical battery 201 is connected by a side fixing component, and the side fixing component is used to support the cylindrical battery 201. There are four middle fixing components designed, which are located between two cylindrical batteries 201 in the vertical direction to provide heat dissipation space for the two cylindrical batteries 201 in the vertical direction; the side fixing components and the middle fixing components are set to provide a certain buffer space when the cylindrical battery 201 expands due to heat during charging and discharging, and at the same time provide flow for the heat dissipation gel The support shell 202 has a hollow interior, which provides space for connecting the electrodes to the cables. The support shell 202 has a certain telescopic support function. When the shell is squeezed, the support shell 202 can provide a certain collapse space for the cylindrical battery 201 to protect the cylindrical battery 201. The guard plate 204 is slidably connected to the side support 210 and the middle support 220 respectively. The side support 210 and the middle support 220 provide support and sliding limit for the guard plate 204, which can provide movement space for the cylindrical battery 201 when it is squeezed or heated and expanded within a certain range.

[0045] A further optimized solution is that the edge fixing assembly includes an edge block 211, and a plurality of sliding limit grooves 222 are opened on the end of the edge block 211 close to the guard plate 204, the edge of the guard plate 204 is slidably connected to the sliding limit grooves 222, and the end of the edge block 211 close to the sliding limit grooves 222 is fixedly connected with a side plate 212, and the side plate 212 is slidably connected to the guard plate 204.

[0046] The top and bottom of the first battery pack are both provided with side fixing components, and each adjacent corner of the guard plate 204 corresponds to a sliding limit groove 222, and each adjacent sliding limit groove 222 is separated by a partition (not shown in the figure), and the partition is used to limit the sliding space of the guard plate 204, so as to ensure that the corner of the guard plate 204 will not be separated from the sliding limit groove 222 while providing sliding space for the guard plate 204; the side fixing components arranged on the top of the first battery pack, and the sliding limit grooves 222 are all located at the bottom of the side block 211, and the first battery pack The side fixing components arranged at the bottom of the group have sliding limit grooves 222 located at the top of the side blocks 211. The side plates 212 and the partition plates are used to limit the sliding space of the protective plate 204. The top surface of the side block 211 at the top of the first battery group located at the top of the shell body abuts against the inner top surface of the upper shell 101. The ground surface of the side block 211 at the bottom of the first battery group located at the bottom of the shell body abuts against the inner bottom surface of the lower shell 102. The side surfaces of the side blocks 211 located at the edge of the first battery group abut against the inner side surfaces of the upper shell 101 and the inner side surfaces of the lower shell 102 respectively.

[0047] According to a further optimized solution, the middle fixed component includes a middle block 221 , and sliding limit grooves 222 are respectively provided at both ends of the middle block 221 , and middle plates 223 are respectively fixedly connected to the two sides of the two sliding limit grooves 222 away from the middle block 221 .

[0048] A reinforcing cylinder (not shown in the figure) is provided in the middle of the middle block 221 to strengthen the connection strength between the middle block 221 and the middle plate 223. Each adjacent corner of the guard plate 204 is slidably connected in a sliding limit groove 222. Adjacent sliding limit grooves 222 on each middle block 221 are separated by partitions (not shown in the figure). The partitions are used to limit the sliding space of the guard plate 204, and their effect is consistent with the function of the sliding limit grooves 222 on the side block 211.

[0049] A further optimized solution is provided, in which the second insulating fixed component includes two symmetrically arranged double buffer plates 301 and two limit bars 303, the two ends of the two limit bars 303 are respectively slidably connected to the two buffer plates, and energy absorbing rings 302 are fixedly connected to the two ends of the limit bars 303. The energy absorbing rings 302 are located in the double buffer plates 301, the two limit bars 303 are clamped with the sheet batteries 304, and the double buffer plates 301 are abutted against the interior of the upper shell 101 and the interior of the lower shell 102.

[0050] One end of the double buffer plate 301 is in contact with the inside of the shell, and the other end clamps the limit bar 303. The ends of the limit bar 303 are slidably connected to the upper and lower parts of the double buffer plate 301 respectively. The double buffer plate 301 provides support and extrusion buffering for the limit bar 303. The two limit bars 303 respectively clamp the upper and lower parts of the side of the sheet battery 304 to firmly fix the sheet battery 304.

[0051] According to a further optimization scheme, a first support 305 is fixedly connected to the bottom of the double buffer plate 301 not close to the inner side of the bottom of the lower shell 102 , a third support 307 is fixedly connected to the bottom of the double buffer plate 301 close to the inner side of the bottom of the lower shell 102 , and a second support 306 is arranged above the third support 307 .

[0052] The double buffer plate 301 is connected through a first support 305, which is located at the inner side of the bottom of the double buffer plate 301 and is fixedly connected; a third support 307 is fixedly connected to the inner side of the bottom of the double buffer plate 301, which is located at the inner side of the bottom of the lower shell 102, that is, the bottom layer, and a second support 306 is fixedly connected to the third support 307. The third support 307 and the first support 305 have the same supporting function, except that the third support 307 can be made of a stronger material than the first support 305 to prevent the sheet battery 304 from being damaged when the bottom of the battery pack is bumped; a guide groove is opened in the middle of the bottom surface of the second support 306. When the bottom of the battery pack is squeezed and the third support 307 is insufficient to support the double buffer plate 301, the second support 306 breaks upward through the guide groove, and the limit bar 303 located at the bottom of the double buffer plate 301 is pushed upward, so that the sheet battery 304 is as far away from the damaged bottom of the lower shell 102 as possible, thereby ensuring the safety of the sheet battery 304 cell and reducing the probability of safety accidents.

[0053] A further optimized solution is that the double buffer plate 301 is composed of two U-shaped elastic support plates, the ends of the two U-shaped elastic support plates form a certain space, the connection position between the end of the limit strip 303 and the energy absorbing ring 302 is formed by the space formed by the two U-shaped elastic support plates, and the distance between the bottoms of the two U-shaped elastic support plates is greater than the distance between the tops.

[0054] The U-shaped elastic support plate is made of elastic, flame-retardant and insulating materials, and the tops of the two U-shaped elastic support plates are placed oppositely and tilted, so that the limit strip 303 can be stuck in the double buffer plate 301 at all times; the setting of the U-shaped elastic support plate can provide a certain heat dissipation space for the adjacent sheet batteries 304 on the left and right, so that the heat dissipation gel can pass through better, which greatly improves the heat dissipation effect of the heat dissipation gel on the battery cell. If the sheet battery 304 is about to spontaneously combust, the heat dissipation gel can cool the sheet battery 304 in time and has the function of instantly extinguishing the flame. If the flame is too large and the heat dissipation gel is not enough to extinguish the flame, the moisture of the heat dissipation gel itself evaporates, which can delay the temperature influence between the battery cells and provide personnel with a longer escape time.

[0055] According to a further optimization scheme, the surfaces where the outer edge 107 and the inner edge 106 meet are provided with serrations.

[0056] During installation, the inner edge 106 and the outer edge 107 do not completely match, which is convenient for disassembly and assembly; the installed battery pack contains a battery module and a fully filled heat dissipation gel. During the heat dissipation process of the battery module, the internal battery module will expand due to the heat, squeezing the inner edge 106, so that the serrations of the inner edge 106 and the outer edge 107 match, which can make the shell more secure. When the operator wants to disassemble the battery pack, if there is pressure inside, it is difficult to separate the upper shell 101 and the lower shell 102 because the serrations of the contact surface of the inner edge 106 and the outer edge 107 match, thus ensuring the safety of personnel. Only when the internal temperature drops and the pressure drops to a normal state, the battery module shrinks to a normal state. At this time, the operator can separate the upper shell 101 and the lower shell 102 more conveniently.

[0057] A novel battery pack manufacturing method comprises the following steps:

[0058] Material grinding: Grind the silver powder through a bead mill to a particle size between 5μm and 15μm to ensure the uniformity of the silver powder in the coating and the anti-moisture permeability effect.

[0059] Premixing of raw materials: 38% of acrylic acid and 38.6% of butyl acetate are uniformly stirred and mixed in advance to form a premix to form a basic paint coating.

[0060] Filler: Add 15% of silver powder into the premix, and add 0.8% of polyether modified polysiloxane, 2.2% of modified acrylic resin, 1.8% of lead chrome yellow, and 3.6% of hindered phenol at the same time, stir and mix thoroughly and evenly to form a mixed silver powder.

[0061] Spraying and curing: Use a sprayer to evenly coat the mixed silver powder on the inner surface of the battery shell. The coating thickness of the mixed silver powder is 90μm-120μm. The coated battery shell is placed at a temperature of 20°C and a humidity of 30%RH~50%RH for drying and curing.

[0062] Strength test: the design pressure is 2.5MPA. The test equipment is an electric pressure test pump: 4DSY-6.3 (6.3MPa). Air is injected through the filling port 103. Based on the strength test pressure of 30% and 60% of the air pressure, a single pressure test is carried out for 15 minutes at a constant pressure. After the test, the pressure is increased to 1.5 times the design pressure and the final strength test is carried out at a constant pressure for 12 hours. If the pressure value at the end of the test time in any stage of the above strength test is equal to the initial constant pressure pressure value data, it is judged as qualified; if the pressure values ​​are different, it is judged as unqualified.

[0063] Tightness test:

[0064] ① Vibration test: The name of the test equipment is automobile vibration tester (model: YH-100Z), the vibration mode is rotary vibration, the vibration frequency range is 100rpm-300rpm, the vibration amplitude is 1 inch (25.4mm), the vibration duration is 30 minutes, and the vibration mode is from 100rpm-300rpm / ten minutes per cycle within 30 minutes, with a total of three cycles of testing. After the vibration test, the appearance is preliminarily observed to see if there are cracks. If there are no cracks, it is judged as qualified, and if there are cracks, it is judged as unqualified.

[0065] ② The design pressure is 2.5MPA. The test equipment is an electric pressure test pump: 4DSY-6.3 (6.3MPa). Air is injected through the filling port 103. The air pressure is 1.0 times the design pressure. The pressure is stabilized for 24 hours. If the pressure value before stabilization is equal to the pressure value after stabilization, it is judged as qualified. If the pressure values ​​are different, it is judged as unqualified.

[0066] Anti-fatigue test: This project is a destructive test, designed for batch sample sampling;

[0067] ①Vibration fatigue test: The name of the test equipment is automobile vibration testing machine (model: YH-100Z), the vibration mode is rotary vibration, the vibration frequency range is 100rpm-300rpm, the vibration amplitude is 1 inch (25.4mm), and the vibration mode is frequency gradient rising and falling cycle, 100rpm, 130rpm, 150rpm, 170rpm, 190rpm, 200rpm, 215rpm, 230rpm, 245rpm, 255rpm, 265rpm, 275rpm, 280rpm, 285rpm, 290rpm, 300rpm, the frequency gradient increases for 1 minute in each stage, and the number of cycles is 90 times. After the vibration test, the appearance is preliminarily observed to see if there are cracks. If there are no cracks, it is qualified, and if there are cracks, it is unqualified.

[0068] ② Temperature hedge test: The name of the test equipment is hot and cold hedge test chamber (model: BA-HSHW), the temperature hedge range is set to -30℃-150℃, the temperature gradient change frequency is 10℃ / minute, the test method is up and down cycle, the number of cycles is 800 times, and the above-mentioned strength test is carried out after the test. Whether it is qualified is determined according to the experimental results of the above test.

[0069] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0070] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A new type of battery pack, characterized in that: The battery pack is filled with heat dissipation gel and comprises a shell, wherein the shell comprises an upper shell (101) and a lower shell (102); the top surface of the upper shell (101) is provided with a filling port (103), a first power source (104) and a second power source (105); the bottom edge of the upper shell (101) extends downward to form an inner edge (106); the bottom edge of the upper shell (101) abuts against the top edge of the lower shell (102); the top edge of the lower shell (102) extends upward to form an outer edge (107); the inner edge (106) and the outer edge (107) are in contact with each other. The contact surfaces are slidably connected, and the surfaces where the outer edge (107) and the inner edge (106) meet are provided with serrations; a battery module is provided inside the upper shell (101) and the lower shell (102), and the battery module is a first module (200), and the first module (200) abuts against the inside of the upper shell (101) and the inside of the lower shell (102); the first module (200) includes a plurality of evenly arranged columnar batteries (201), the heat dissipation gel is in direct contact with the side of the columnar battery (201), and the columnar battery (201) is provided with A first insulating fixing component is provided, the first insulating fixing component abutting against the interior of the upper shell (101) and the interior of the lower shell (102), the columnar batteries (201) are evenly arranged in a plurality of layers inside the shell, at least two layers of columnar batteries (201) are configured as a first battery group, and a hollow support plate is provided between each group of the first battery groups; each group of the first insulating fixing component simultaneously fixes two columnar batteries (201) in a vertical direction, the first insulating fixing component comprising a side fixing component and a middle fixing component, the side fixing components being located at two vertical positions. At the upper and lower ends of the two columnar batteries (201) arranged vertically, the side fixing assembly comprises two groups of side supports (210) symmetrically arranged up and down, a guard plate (204) is slidably connected between each group of side supports (210), a support shell (202) is fixedly connected to a side of the guard plate (204) close to the columnar battery (201), a side of the support shell (202) away from the guard plate (204) is fixedly connected to the columnar battery (201), and a wire opening (203) is provided between the guard plate (204) and the support shell (202);The middle fixing assembly is located between the two columnar batteries (201), and the middle fixing assembly comprises a plurality of middle supports (220), two guard plates (204) and two support shells (202). The two guard plates (204) are vertically arranged up and down, the guard plate (204) located at the top is slidably connected to the upper part of the middle support (220), the side of the upper guard plate (204) away from the middle support (220) is fixed to one of the support shells (202), the upper part of the support shell (202) is fixed to the bottom of the columnar battery (201), the guard plate (204) located at the bottom is slidably connected to the lower part of the middle support (220), the side of the lower guard plate (204) away from the middle support (220) is fixed to the other support shell (202), and the lower part of the support shell (202) is fixed to the top of the other columnar battery (201). ; 2. The novel battery pack according to claim 1 is characterized in that: The edge fixing assembly comprises an edge block (211); a plurality of sliding limit grooves (222) are formed on the edge block (211) at an end close to the guard plate (204); the edge of the guard plate (204) is slidably connected to the sliding limit grooves (222); the end of the edge block (211) close to the sliding limit grooves (222) is fixedly connected to a side plate (212); and the side plate (212) is slidably connected to the guard plate (204).

3. The novel battery pack according to claim 2 is characterized in that: The middle fixing assembly comprises a middle block (221), the two ends of the middle block (221) are respectively provided with the sliding limit grooves (222), and the two sides of the sliding limit grooves (222) away from the middle block (221) are respectively fixed with middle plates (223).

4. A new type of battery pack, characterized in that: The battery pack is filled with heat dissipation gel and comprises a shell, wherein the shell comprises an upper shell (101) and a lower shell (102); the top surface of the upper shell (101) is provided with a filling port (103), a first power source (104) and a second power source (105); an inner edge (106) extends downward from the bottom edge of the upper shell (101); the bottom edge of the upper shell (101) abuts against the top edge of the lower shell (102); an outer edge (107) extends upward from the top edge of the lower shell (102); the inner edge (106) and the outer edge (107) are slidably connected to each other at contact surfaces; the outer edge (107) and the inner edge (106) are connected to each other at contact surfaces. ) are provided with saw teeth at the joint surfaces; a battery module is provided inside the upper shell (101) and the lower shell (102), the battery module is a second module (300), the second module (300) is in contact with the interior of the upper shell (101) and the interior of the lower shell (102); the second module (300) comprises a plurality of evenly arranged sheet-shaped batteries (304), the heat dissipation gel is in direct contact with the outer side surface of the sheet-shaped batteries (304), each of the sheet-shaped batteries (304) is sleeved with a second insulating fixing component, the second insulating fixing component is respectively in contact with the interior of the upper shell (101) and the interior of the lower shell (102), The sheet-shaped batteries (304) are evenly arranged in a plurality of layers inside the shell, at least one layer of the sheet-shaped batteries (304) is configured as a second battery group, a hollow support plate is arranged between each group of the second battery groups, and the hollow support plate abuts against the inside of the upper shell (101) and the inside of the lower shell (102); the second insulating fixing component comprises two symmetrically arranged double buffer plates (301) and two limit bars (303), the two ends of the two limit bars (303) are respectively slidably connected to the two double buffer plates (301), the two ends of the limit bars (303) are fixedly connected to energy absorbing rings (302), and the energy absorbing rings ( The double buffer plate (302) is located in the double buffer plate (301), the two limit bars (303) are clamped with the sheet battery (304), the double buffer plate (301) is in contact with the interior of the upper shell (101) and the interior of the lower shell (102), a first support (305) is fixedly connected to the bottom of the double buffer plate (301) not close to the inner side of the bottom of the lower shell (102), a third support (307) is fixedly connected to the bottom of the double buffer plate (301) close to the inner side of the bottom of the lower shell (102), a second support (306) is arranged above the third support (307), and a guide groove is opened in the middle of the ground of the second support 306.

5. The novel battery pack according to claim 4 is characterized in that: The double buffer plate (301) is composed of two U-shaped elastic support plates, the ends of the two U-shaped elastic support plates form a certain space, the connection position between the end of the limit strip (303) and the energy absorption ring (302) passes through the space formed by the two U-shaped elastic support plates, and the distance between the bottoms of the two U-shaped elastic support plates is greater than the distance between the tops.

6. The novel battery pack according to any one of claims 1 to 5, characterized in that: The method for manufacturing the housing comprises the following steps: Material grinding; Premixing of raw materials; filler; Spray curing; Strength test; Tightness test; Fatigue resistance test.

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