Intrinsically safe lithium battery pack

Abstract

The utility model relates to an intrinsically safe lithium battery pack and belongs to the technical field of battery boxes. Comprising a box body, a plurality of battery mounting seats, an aerosol reaction box and a control assembly. A valve port for releasing pressure is formed in the box body; a battery cell is arranged in each battery mounting seat, and the battery cell is a semi-solid battery cell; the aerosol reaction box is mounted in the box body; the control assembly is used for detecting the working state of the battery mounting base and providing power-off protection. The safety of the overall structure of the battery box is improved by arranging the pressure relief valve port on the box body, the thermal stability is improved and the service life is prolonged by arranging the semi-solid battery cell, the strength of the internal structure of the battery is improved by arranging the plurality of battery mounting seats, and the voltage of the battery cell is controlled and protected by arranging the control assembly; and the battery replacement pile is more suitable for repeated replacement and use.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery boxes, in particular to an intrinsically safe lithium battery pack. Background Art

[0002] In the rapidly developing battery production industry, the structure and materials of batteries, as well as the control of battery boxes, all play an important role in battery safety. For electric-powered riding equipment, the battery replacement services provided by replaceable battery piles are becoming increasingly popular. For batteries used in battery replacement piles with high power demands and high-frequency replacement, the safety of the battery box needs to be treated more strictly. Common battery cells include ternary lithium cells and lithium iron phosphate cells. During the high-frequency charging and discharging process of battery replacement pile equipment, thermal runaway may occur due to poor contact or defects in the battery itself. Intrinsically safe design is carried out for battery packs in the field to reduce or eliminate risks caused by the properties of the battery cell materials themselves and the structure of the battery box itself.

[0003] The patent with publication number: CN115566319A provides a battery box with improved fire extinguishing safety performance, including a box body, a plurality of battery cell cavities are provided in the box body, and a plurality of battery cells are arranged in each battery cell cavity; wherein: a heat dissipation air duct is provided between adjacent battery cell cavities, and a temperature probe is provided in the heat dissipation air duct; each battery cell cavity is connected to an aerosol storage device, the electrical signal input end of the aerosol storage device is connected to the temperature probe, and the aerosol output end of the aerosol storage device is respectively connected to the plurality of battery cell cavities; when the aerosol storage device fills the battery cell cavity with aerosol, the aerosol storage device sprays the aerosol onto the plurality of battery cells.

[0004] The above-mentioned prior art has at least the following problems during use:

[0005] The battery box used in the battery replacement pile needs to maintain a stable structural state and safety performance during high-frequency replacement and charging and discharging. The structural protection of the battery box is limited by simply setting up aerosols and heat dissipation ducts, and the battery box does not have an explosion-proof structure, so the safety level is not high enough. Utility Model Content

[0006] The utility model provides an intrinsically safe lithium battery pack, which is used to solve the technical problem in the prior art of having no explosion-proof structure and insufficient safety during high-frequency replacement and charge-discharge use.

[0007] In order to achieve the above purpose, the present invention is implemented through the following technical solutions:

[0008] The intrinsically safe lithium battery pack includes a housing, multiple battery mounts, an aerosol reaction box, and a control component. The housing is provided with a pressure relief valve; each battery mount contains a semi-solid cell; the aerosol reaction box is mounted within the housing; and the control component is used to detect the operating status of the battery mounts and provide power-off protection.

[0009] The device further includes: a sound-generating unit, a plurality of partitions, and a plastic sleeve. The sound-generating unit is connected to the control assembly and the aerosol reaction box for providing an alarm; the plurality of partitions are respectively abutted against the electrodes of the plurality of battery mounts on both sides and above and below, forming a sol channel between the partitions and the battery mounts; and the plastic sleeve is mounted over the plurality of battery mounts and the plurality of partitions.

[0010] Furthermore, the control component detects the voltage of each battery through electrical connection and provides abnormal power-off protection.

[0011] Furthermore, the battery mounting seat is provided with a mounting cavity, both ends of the battery mounting seat are provided with positioning holes connected to other battery mounting seats, and the side walls of both ends are provided with mounting grooves for passing the electrodes of the battery cells.

[0012] Furthermore, the box body includes: a first side panel, a second side panel, a cover panel, and a handle. The valve ports are provided in two locations, one on each side of the first side panel and provided with explosion-proof markings; the second side panel is mounted on the first side panel; the cover panel is mounted on the first and second side panels; the cover panel has an interface, which is communicatively connected to the control assembly and electrically connected to the battery mounting base; and the handle is rotatably mounted on the cover panel.

[0013] Furthermore, it also includes: a plurality of cushion pads, two silicone rubber sheets, and a plurality of shock-absorbing blocks. The plurality of cushion pads are installed on the circumference of the plastic sleeve; the two silicone rubber sheets are installed on the top and bottom of the plastic sleeve respectively; and the plurality of shock-absorbing blocks are installed between the cover plate and the silicone rubber sheets.

[0014] Furthermore, it also includes: positive and negative copper sheets, a cross-copper busbar, and multiple fixing plates. The positive and negative copper sheets are installed on two adjacent battery mounts to connect the cells in the two battery mounts; the cross-copper busbar is used to connect the two groups of battery mounts, with the multiple battery mounts divided into two groups and connected by the positive and negative copper sheets respectively; the cross-copper busbar is used to connect the two groups of battery mounts; the multiple fixing plates are also provided with positioning posts on the battery mounts, and positioning holes are opened on the fixing plates to fix the multiple battery mounts together.

[0015] Furthermore, the fixing plate is an epoxy resin plate.

[0016] Furthermore, the buffer pad and the shock absorbing block are both foam boards.

[0017] The utility model provides an intrinsically safe lithium battery pack, which has the following beneficial effects:

[0018] By setting a valve port for pressure relief on the box body, the internal pressure caused by overheating of the battery cell is prevented from being too high, and by setting a control component to detect the voltage of the battery cell in a single battery mounting seat, when one battery cell has an abnormality, power-off protection and error reporting can be performed in advance to prevent safety accidents caused by pressure loss; by replacing the battery cell with a semi-solid battery cell, the thermal stability is improved, making it safer and more reliable in the special scenario of high-voltage fast-charging battery replacement piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the disassembled structure of an intrinsically safe lithium battery pack provided by an embodiment of the present utility model;

[0021] Figure 2 for Figure 1 A magnified view of point A1 in the middle;

[0022] Figure 3 A schematic structural diagram of an intrinsically safe lithium battery pack provided by an embodiment of the present utility model;

[0023] Figure 4 A schematic structural diagram of a battery mounting base for an intrinsically safe lithium battery pack provided by an embodiment of the present utility model;

[0024] Figure 5 This is a schematic structural diagram of the intrinsically safe lithium battery pack provided by an embodiment of the present utility model with the box removed.

[0025] In the figure: 10-box; 101-valve port; 201-battery mounting seat; 202-aerosol reaction box; 203-control component; 204-sound unit; 205-partition; 207-plastic sleeve; 102-first side panel; 103-second side panel; 104-cover; 105-interface; 106-handle; 208-cushion; 209-silicone skin; 2010-shock absorber; 2011-positive and negative copper sheets; 2012-jumper copper busbar; 2013-fixing plate; 2014-positioning column. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0027] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, 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 cannot be understood as a limitation on this application.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installation," "connection," and "connection" should be understood in a broad sense. For example, they can refer to welding, bolting, or riveting; fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0030] Example:

[0031] Please refer to Figures 1 to 5 As shown, this embodiment provides an intrinsically safe lithium battery pack, comprising: a housing 10, multiple battery mounts 201, an aerosol reaction box 202, and a control assembly 203. The housing 10 is provided with a valve 101 for pressure relief; each battery mount 201 is provided with a semi-solid battery cell; the aerosol reaction box 202 is mounted within the housing 10; and the control assembly 203 is used to detect the operating status of the battery mounts 201 and provide power-off protection.

[0032] In this embodiment, if Figures 1 to 5As shown, the battery mount 201 can be made of aluminum alloy to improve the structural strength of the battery mount 201, thereby reducing the weight of the device and improving the ability to withstand external impact and pressure. Both sides of the battery mount 201 are coated with an insulating layer to further improve the stability after the battery cell is installed. The control component 203 includes a power protection board and a control element. The aerosol reaction box 202 is set inside the box body 10 of the battery box. When a fire occurs in the battery, an electric start or temperature sensing start method is used to activate the fire extinguishing agent. Through the output pipe set on the aerosol reaction box 202, the aerosol reaction box 202 is guided to quickly output a large amount of sub-nanometer solid phase particles and an inert gas mixture to chemically suppress the fire site, physically cool it, dilute oxygen, and other multiple effects, further improving the safety performance of the battery box. In addition, a pressure relief valve is provided on the surface of the box body 10 at the place where the nameplate and explosion-proof mark are located. When the internal pressure of the battery is too high, the pressure inside the battery box will be released through the pressure relief valve at the place where the nameplate and explosion-proof mark are located, thereby preventing the battery box from exploding due to excessive pressure.

[0033] Furthermore, in some implementations of this embodiment, Figures 1 to 5 As shown, the device further includes: a sound unit 204, multiple partitions 205, and a plastic sleeve 207. The sound unit 204 is connected to the control assembly 203 and the aerosol reaction box 202 for communication and alarming. The multiple partitions 205 are respectively abutted against the electrodes of the multiple battery mounts 201 on both sides and above and below, forming a sol channel between the partitions 205 and the battery mounts 201. The plastic sleeve 207 is mounted over the multiple battery mounts 201 and the multiple partitions 205.

[0034] In this embodiment, if Figure 2 As shown, the sound-emitting unit 204 can be specifically a cavity speaker, which is controlled by the control component 203 and the aerosol reaction box 202 and is used to alarm for battery abnormalities and fires. The partition 205 is epoxy resin, which is used to fix the installation position between the multiple battery mounts 201, and to insulate the electrodes at both ends of the battery cell and the battery mounts 201 to prevent contact-induced electrification, thereby affecting the overall service life and safety of the battery box. The plastic sleeve 207 is used to plastic-encapsulate the multiple battery mounts 201, so that the multiple battery mounts 201 form a whole, which is convenient for subsequent installation and maintenance.

[0035] Furthermore, in some implementations of this embodiment, Figure 2 As shown, the control component 203 detects the voltage of each battery through electrical connection and provides abnormal power-off protection.

[0036] In this embodiment, if Figure 2As shown, the control component 203 is specifically a battery protection board, which is used to cut off the circuit for protection against abnormal conditions during the charging and discharging process of the battery, including but not limited to overcharging and over-discharging of the voltage, as well as cutting off the battery circuit for abnormal current, abnormal temperature and short circuit, so as to maximize the safety and service life of the battery.

[0037] Furthermore, in some implementations of this embodiment, Figure 4 and Figure 5 As shown, the battery mounting seat 201 is provided with a mounting cavity, and both ends of the battery mounting seat 201 are provided with positioning holes connected to other battery mounting seats 201, and the side walls of both ends are provided with mounting grooves for passing the electrodes of the battery cells.

[0038] In this embodiment, if Figure 4 and Figure 5 As shown, the battery mount 201 can be made of aluminum alloy, which is easy to process and has a stable material. Positioning holes are set at both ends of the battery mount 201, and two positioning holes form a group. The two sides of the battery mount 201 are symmetrically arranged, and both ends are covered with an insulating coating.

[0039] Furthermore, in some implementations of this embodiment, Figure 3 As shown, the box body 10 includes: a first side panel 102, a second side panel 103, a cover panel 104, and a handle 106. There are two valve ports 101, one on each side of the first side panel 102 and marked with explosion-proof markings. The second side panel 103 is mounted on the first side panel 102. The cover panel 104 covers the first and second side panels 102 and 103 and has an interface 105 on the cover panel 104. The interface 105 is communicatively connected to the control assembly 203 and electrically connected to the battery mounting base 201. The handle 106 is rotatably mounted on the cover panel 104.

[0040] In this embodiment, if Figure 3 As shown, the first side panel 102 includes three side surfaces, and the second side panel 103 includes one side surface and a bottom surface. The valve port 101 is located at a position with an explosion-proof mark, which is used to quickly release pressure in the box body 10 to prevent a violent explosion. The battery is installed in the first side panel 102 and the second side panel 103 is installed in the split side panel, so that the gap between the battery and the first side panel 102 and the second side panel 103 can be easily adjusted, thereby reducing bumps during use. The cover 104 is provided on the four sides and is locked and fixed by screws. The cover 104 is provided with a rotatable handle 106 for easy use when replacing the battery.

[0041] Furthermore, in some implementations of this embodiment, Figure 1As shown, the device further includes: multiple cushioning pads 208, two silicone rubber sheets 209, and multiple shock-absorbing blocks 2010. The cushioning pads 208 are mounted on the sides of the plastic sleeve 207; the two silicone rubber sheets 209 are mounted on the top and bottom of the plastic sleeve 207 respectively; and the shock-absorbing blocks 2010 are mounted between the cover plate 104 and the silicone rubber sheets 209.

[0042] In this embodiment, if Figure 1 As shown, the buffer pad 208 mainly acts on the four sides of the plastic sleeve 207 after the battery mounting base 201 is plastic-sealed, and is used to fill the gap between the first side plate 102 and the second side plate 103 and the plastic sleeve 207 to fill the gap and buffer the external impact force, thereby improving the stability and safety of the overall structure of the battery box. The silicone rubber 209 is installed at the bottom and top to further insulate the battery electrodes and improve the stability of the battery box. The shock-absorbing block 2010 is installed between the silicone rubber 209 outside the plastic sleeve 207 and the cover plate 104. Due to the large gap here and the installation of the handle 106, the gap between the cover plate 104 and the silicone rubber 209 during transportation will cause the internal structure of the battery to shake, thereby affecting the stability and safety of the overall structure. By providing multiple shock-absorbing blocks 2010 and filling them between the cover plate 104 and the silicone rubber 209, the impact or even damage to the internal structure of the battery caused by the bumps during installation and replacement is reduced, thereby improving the reliability of the battery box.

[0043] Furthermore, in some implementations of this embodiment, Figure 5 As shown, the battery pack further includes: positive and negative copper sheets 2011, a jumper copper bar 2012, and multiple fixing plates 2013. The positive and negative copper sheets 2011 are installed on two adjacent battery mounts 201 and are used to connect the battery cells in the two battery mounts 201; the jumper copper bar 2012 is used to connect the two groups of battery mounts 201 by connecting the multiple battery mounts 201 through the positive and negative copper sheets 2011; the jumper copper bar 2012 is used to connect the two groups of battery mounts 201; the multiple fixing plates 2013 are also provided with positioning posts 2014 on the battery mounts 201, and the fixing plates 2013 are provided with positioning holes for fixing the multiple battery mounts 201.

[0044] In this embodiment, if Figure 5As shown, in the same group of battery mounts 201, positive and negative copper sheets 2011 are used to connect the electrodes, and a jumper copper bus 2012 is used to connect and install between two groups of battery mounts 201, and mounting holes are provided on the copper bus for fixing and passing through the positioning column 2014, and a partition 205 is provided between the positive and negative copper bus and the jumper copper bus 2012 and the battery mount 201, for fixing the relative installation positions between multiple battery mounts 201 in each group of battery mounts 201, and a heightening seat is provided at both ends of the battery mount 201 for setting a gap between the battery mounts 201, which is beneficial to the rapid filling of aerosol and heat dissipation between charging and discharging.

[0045] Furthermore, in some implementations of this embodiment, the fixing plate 2013 is an epoxy resin plate. Each set of fixing plates 2013 of corresponding sizes are cut on both sides and are clamped with the plurality of positioning posts 2014 to improve the overall structural strength.

[0046] Furthermore, in some implementations of this embodiment, the buffer pad 208 and the shock absorbing block 2010 are both foam boards.

[0047] In summary, the present invention provides an intrinsically safe lithium battery pack, which improves the thermal stability of the battery cells, the stability and service life in high-voltage fast charging and high-frequency charging and discharging environments by adopting semi-solid battery cells. This improves the safety of the battery box; by setting a split box body 10, the box body 10 is divided into a first side plate 102 and a second side plate 103, and a plurality of buffer pads 208 are used to fill the gap between the first side plate 102 and the second side plate 103 and the battery cells, thereby further improving the reliability of the installation and the overall structural strength of the battery box, and is more suitable for battery replacement piles that require frequent transportation and replacement; by setting a plurality of explosion-proof valve ports 101, the high pressure inside the battery box is released, further improving the reliability and safety of the overall battery structure; by setting a control component 203 to monitor the battery voltage, the monitoring and alarm of the battery in abnormal state are improved, thereby providing reliable power-off protection and further improving the safety of battery use.

[0048] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. Intrinsically safe lithium battery pack, characterized by: include: A box body (10), wherein a valve port (101) for pressure relief is provided on the box body (10); A plurality of battery mounting seats (201), each of the battery mounting seats (201) being provided with a battery core, and the battery core being a semi-solid battery core; an aerosol reaction box (202), installed in the box (10); The control component (203) is used to detect the working state of the battery mounting seat (201) and provide power-off protection.

2. The intrinsically safe lithium battery pack according to claim 1, characterized in that: Also includes: a sound generating unit (204), which is in communication with the control component (203) and the aerosol reaction box (202) and is used for alarming; A plurality of separators (205) are respectively disposed in contact with both sides and upper and lower sides of the electrodes of the plurality of battery mounting seats (201), and a sol channel is formed between the separators (205) and the battery mounting seats (201); The plastic sleeve (207) is sleeved outside the plurality of battery mounting seats (201) and the plurality of partitions (205).

3. The intrinsically safe lithium battery pack according to claim 2, characterized in that: The control component (203) detects the voltage of each battery cell through electrical connection and provides abnormal power-off protection.

4. The intrinsically safe lithium battery pack according to claim 3, characterized in that: The battery mounting seat (201) is provided with a mounting cavity, and both ends of the battery mounting seat (201) are provided with positioning holes connected to other battery mounting seats (201), and the side walls of both ends are provided with mounting grooves for passing the electrodes of the battery core.

5. The intrinsically safe lithium battery pack according to claim 4, characterized in that: The box (10) comprises: A first side plate (102), the valve ports (101) having two valve ports, which are respectively opened on both sides of the first side plate (102) and are provided with explosion-proof markings; a second side plate (103), mounted on the first side plate (102); A cover plate (104) is provided on the first side plate (102) and the second side plate (103); an interface (105) is provided on the cover plate (104); the interface (105) is communicatively connected to the control component (203) and electrically connected to the battery mounting seat (201); The handle (106) is rotatably mounted on the cover plate (104).

6. The intrinsically safe lithium battery pack according to claim 5, characterized in that: Also includes: A plurality of buffer pads (208) are installed on the peripheral side of the plastic sleeve (207); Two silicone rubber sheets (209) are respectively installed on the top and bottom of the plastic sleeve (207); A plurality of shock-absorbing blocks (2010) are installed between the cover plate (104) and the silicone skin (209).

7. The intrinsically safe lithium battery pack according to claim 6, characterized in that: Also includes: Positive and negative copper sheets (2011), mounted on two adjacent battery mounting seats (201), and used to connect the battery cells in the two battery mounting seats (201); A cross-connecting copper busbar (2012), wherein the plurality of battery mounting seats (201) are divided into two groups and connected respectively via the positive and negative copper sheets (2011), and the cross-connecting copper busbar (2012) is used to connect the two groups of battery mounting seats (201); A plurality of fixing plates (2013) are provided, and a positioning column (2014) is further provided on the battery mounting seat (201). Positioning holes are provided on the fixing plates (2013) for fixing the plurality of battery mounting seats (201).

8. The intrinsically safe lithium battery pack according to claim 7, characterized in that: The fixing plate (2013) is an epoxy resin plate.

9. The intrinsically safe lithium battery pack according to claim 6, characterized in that: The buffer pad (208) and the shock absorbing block (2010) are both foam boards.

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