A device for balancing the voltage between cells in a lithium battery pack

Abstract

The present invention relates to a device for balancing the voltages between cells in a lithium battery pack, comprising a device housing, a maintenance and protection stabilization structure, and a control unit. The four corners of the device housing are provided with connection seats, and fixing bolts are installed inside the connection seats. The upper end surface of the device housing is inlaid with a display screen, and the lower end surface of the bottom plate is provided with a harness groove, and the end of the harness groove is connected to a plug-in board matching groove, and the control unit is arranged inside the device housing. The present invention can facilitate mutual connection with lithium battery components through the provided connection harness and plug-in board, so that the device can facilitate equalization of the lithium battery pack. The plug-in board with a plug-in structure can be conveniently plugged into each battery connection point of the lithium battery pack, so that the voltage of each cell in the battery pack can be conveniently connected at a fixed point. The control unit can facilitate equalization of the voltages between the cells in the lithium battery pack.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery packs, and in particular to a device for balancing the voltages between cells in a lithium battery pack. Background Art

[0002] Lithium battery is a primary battery that uses lithium metal or lithium alloy as the negative electrode material and non-aqueous electrolyte solution. It is different from rechargeable lithium-ion battery and lithium-ion polymer battery. The inventor of lithium battery is Edison. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements. Therefore, lithium batteries have not been used for a long time. With the development of microelectronics technology at the end of the 20th century, the number of miniaturized devices has increased, and high requirements have been placed on power sources. Lithium batteries have entered the large-scale practical stage. Voltage, also known as potential difference or potential difference, is a physical quantity that measures the energy difference generated by unit charge in an electrostatic field due to different potentials. Its magnitude is equal to the work done by a unit positive charge moving from point A to point B due to the action of the electric field force, and the direction of voltage is defined as from high potential to low potential.

[0003] Lithium battery packs have the problem of insufficient safety when in use, and it is impossible to detect and measure data such as current and voltage for each cell inside the lithium battery pack. At the same time, there is also the problem of inconvenient connection between the lithium battery pack cells and the voltage balancing device. For this reason, we propose a more practical device for balancing the voltage between each cell in a lithium battery pack. Summary of the invention

[0004] The purpose of the present invention is to provide a device for balancing the voltages between cells in a lithium battery pack, so as to solve the problem of insufficient safety of the lithium battery pack during use proposed in the above-mentioned background technology, and the inability to detect and measure data such as current and voltage for each cell inside the lithium battery pack. At the same time, there is also the problem of inconvenient connection between the cells of the lithium battery pack and the voltage balancing device.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for balancing the voltages between each monomer in a lithium battery pack, comprising a device housing, a maintenance and protection stabilization structure and a control unit, wherein the four corners of the device housing are provided with connection seats, and fixing bolts are installed inside the connection seats, the upper end face of the device housing is inlaid with a display screen, the rear end face of the device housing is provided with a wiring hole, and the outer side of the wiring hole is connected to a connecting wire harness, and the end of the connecting wire harness is connected to a plug board, the bottom end of the device housing is connected to a base plate, and the outer edge of the base plate is connected to a connecting hinge, the maintenance and protection stabilization structure is installed at the bottom end of the inside of the device housing, and an exhaust structure is provided inside the maintenance and protection stabilization structure, the lower end face of the base plate is provided with a wire harness groove, and the end of the wire harness groove is connected to a plug board matching groove, and the control unit is arranged inside the device housing.

[0006] Preferably, the maintenance protection stability structure includes a protective pressure plate, a limit card block, a limit card slot and a gap support pad, and the four corners of the protective pressure plate are provided with a limit card block, and the outer side of the limit card block is provided with a limit card slot, and the upper end surface of the protective pressure plate is provided with a gap support pad.

[0007] Preferably, the protective pressure plate forms a snap-fit ​​structure with the device housing through a limit block and a limit slot, and the outer dimensions of the limit block and the limit slot match.

[0008] Preferably, the exhaust structure includes a heat exhaust motor, exhaust fan blades and ventilation holes, and the output end of the heat exhaust motor is connected to the exhaust fan blades, and the ventilation holes are arranged on the outer sides of the exhaust fan blades.

[0009] Preferably, a rotating structure is formed between the heat exhaust motor and the exhaust fan blades, and the exhaust structure and the control unit are parallel to each other.

[0010] Preferably, connecting bolts are provided at both left and right ends of the control unit, and the upper ends of the connecting bolts are connected to limited connection seats.

[0011] Preferably, the connecting bolt passes through the interior of the maintenance protection stability structure and the control unit, and the connecting bolt and the limiting connecting seat are threadedly connected.

[0012] Preferably, the control unit includes a voltage divider module, a voltage detection module, a temperature control module and a current detection module, and a voltage detection module is arranged on the right side of the voltage divider module, and a temperature control module is arranged on the right side of the voltage detection module, and a current detection module is arranged on the right side of the temperature control module.

[0013] Preferably, the voltage divider module, the voltage detection module, the temperature control module and the current detection module are all electrically connected in parallel, and the control unit is electrically connected to the plug board via a wiring hole and a connecting harness.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The maintenance protection stabilizing structure provided in the present invention can facilitate the disassembly and maintenance of the device, thereby improving the convenience of using and maintaining the device. The engagement of the limit block with the limit slot can achieve a limiting effect, thereby avoiding the problem of uneven assembly of the protection pressure plate. At the same time, the provision of a gap support pad can keep a certain space between the protection pressure plate and the control structure of the device, thereby facilitating air circulation.

[0016] 2. The exhaust structure provided in the present invention can achieve the effect of ventilation and heat dissipation. The heat exhaust motor provided can drive the exhaust fan blades to rotate, so that the electronic control components inside the equipment can be cooled by the exhaust fan blades. At the same time, a certain gap is maintained between the electronic control structure and the equipment casing during the setting, thereby improving the heat dissipation effect of the equipment.

[0017] 3. The present invention can facilitate the interconnection between lithium battery components through the connection harness and the plug-in board, so that the equipment can facilitate the equalization of the lithium battery pack. The plug-in board with a plug-in structure can be conveniently plugged into each battery connection point of the lithium battery pack, so that the voltage of each single cell in the battery pack can be conveniently connected at a fixed point.

[0018] 4. The present invention can store and match the connection harness and the plug board for use by setting the harness slot and the plug board matching slot, which can improve the convenience of using the device, avoid being unable to find a suitable connection harness and plug board to connect with the lithium battery assembly when using the device, and also avoid the problem of scattered placement of the connection harness and the plug board.

[0019] 5. The present invention can easily balance the voltage between the cells in the lithium battery pack through the control unit provided, the voltage detection module provided can conveniently measure the voltage of each cell in the lithium battery pack, and the voltage divider module provided can perform voltage division processing on each cell with abnormal voltage, thereby preventing the abnormal cell voltage from affecting the operation of the entire battery pack. At the same time, the output current and the surrounding temperature of each cell can be detected respectively according to the temperature control module and the current detection module, thereby improving the safety of the lithium battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of the bottom plate of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the lower end surface of the bottom plate of the present invention;

[0023] Figure 4 It is a schematic diagram of the internal structure of the housing of the device of the present invention;

[0024] Figure 5 It is a schematic diagram of the working process of the present invention.

[0025] In the figure: 1. Equipment housing; 1. Connecting seat; 2. Fixing bolts; 3. Display screen; 4. Wiring hole; 5. Connecting wire harness; 6. Plug-in board; 7. Connecting hinge; 8. Bottom plate; 9. Maintenance protection stability structure; 10. Protective pressure plate; 1001. Limiting block; 1002. Limiting slot; 1003. Gap support pad; 1004. Exhaust structure; 11. Heat exhaust motor; 111. Exhaust fan blades; 112. Ventilation holes; 113. Wiring harness slot; 12. Plug-in board matching slot; 13. Control unit; 14. Voltage divider module; 141. Voltage detection module; 142. Temperature control module; 143. Current detection module; 144. Limiting connector; 16. Connecting bolts. DETAILED DESCRIPTION

[0026] 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.

[0027] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention 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 operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] See also Figure 1-5 The present invention provides a technical solution: a device for balancing the voltages between monomers in a lithium battery pack, comprising a device housing 1, a maintenance and protection stabilizing structure 10 and a control unit 14, wherein the four corners of the device housing 1 are provided with connection seats 2, and the interior of the connection seats 2 is provided with fixing bolts 3, the upper end surface of the device housing 1 is inlaid with a display screen 4, the rear end surface of the device housing 1 is provided with a wiring hole 5, and the outer side of the wiring hole 5 is connected with a connection harness 6, and the end of the connection harness 6 is connected with a plug board 7, and the connection harness 6 and the plug board 7 are provided to facilitate mutual connection with lithium battery components, so that the device can facilitate equalization of the lithium battery pack, and the plug board 7 with a plug structure can be conveniently plugged into each battery connection point of the lithium battery pack, so that the voltage of each monomer in the battery pack can be conveniently connected at a fixed point;

[0029] The bottom end of the device housing 1 is connected to a bottom plate 9, and the outer edge of the bottom plate 9 is connected to a connecting hinge 8. The maintenance protection and stability structure 10 is installed at the bottom end of the device housing 1, and the maintenance protection and stability structure 10 is provided with an exhaust structure 11. The maintenance protection and stability structure 10 includes a protection pressure plate 1001, a limit card block 1002, a limit card slot 1003 and a gap support pad 1004, and the four corners of the protection pressure plate 1001 are provided with a limit card block 1002, and the outer side of the limit card block 1002 is provided with a limit card slot 1003, and the upper end surface of the protection pressure plate 1001 is provided with a gap support pad 1004, and the protection pressure plate 100 1 The engagement structure is formed between the limit block 1002 and the limit slot 1003 and the device housing 1, and the outer dimensions of the limit block 1002 and the limit slot 1003 match each other. The maintenance protection stabilizing structure 10 is provided to facilitate the disassembly and maintenance of the device, thereby improving the convenience of the use and maintenance of the device. The engagement of the limit block 1002 and the limit slot 1003 can achieve a limiting effect, thereby avoiding the problem of uneven assembly of the protective pressure plate 1001. At the same time, the provision of the gap support pad 1004 can keep a certain space between the protective pressure plate 1001 and the control structure of the device, thereby facilitating the circulation of air.

[0030] The maintenance protection stability structure 10 includes a protection pressure plate 1001, a limit card block 1002, a limit card slot 1003 and a gap support pad 1004, and the four corners of the protection pressure plate 1001 are provided with a limit card block 1002, and the outer side of the limit card block 1002 is provided with a limit card slot 1003, and the upper end surface of the protection pressure plate 1001 is provided with a gap support pad 1004, and the protection pressure plate 1001 forms a clamping structure with the device housing 1 through the limit card block 1002 and the limit card slot 1003, and the outer dimensions of the limit card block 1002 and the limit card slot 1003 match, and the exhaust structure 11 provided can achieve the effect of ventilation and heat dissipation, and the exhaust fan blades 112 can be driven to rotate by the heat exhaust motor 111 provided, so that the exhaust fan blades 112 can be used to dissipate heat for the electric control components inside the device, and at the same time, a certain gap is kept between the electric control structure and the device housing 1 during the setting, so as to improve the heat dissipation effect of the device;

[0031] The lower end surface of the bottom plate 9 is provided with a harness groove 12, and the end of the harness groove 12 is connected to a plug board matching groove 13. The harness groove 12 and the plug board matching groove 13 can store and match the unused connection harness 6 and the plug board 7, which can improve the convenience of using the device, avoid the inability to find a suitable connection harness 6 and the plug board 7 to plug and unplug the lithium battery assembly when using the device, and also avoid the problem of scattered placement of the connection harness 6 and the plug board 7;

[0032] The control unit 14 is arranged inside the device housing 1, and connecting bolts 16 are arranged on both left and right ends of the control unit 14, and the upper ends of the connecting bolts 16 are connected to the limited connection seat 15, and the connecting bolts 16 pass through the interior of the maintenance protection stability structure 10 and the control unit 14, and the connecting bolts 16 and the limited connection seat 15 are threadedly connected. The control unit 14 includes a voltage dividing module 141, a voltage detection module 142, a temperature control module 143 and a current detection module 144, and the voltage detection module 142 is arranged on the right side of the voltage dividing module 141, and the temperature control module 143 is arranged on the right side of the voltage detection module 142, and the current detection module 144 is arranged on the right side of the temperature control module 143, and the voltage dividing module 141, the voltage detection module 142, the voltage detection module 143, and the current detection module 144 is arranged on the right side of the temperature control module 143. The voltage detection module 142, the temperature control module 143 and the current detection module 144 are all electrically connected in parallel, and the control unit 14 is electrically connected to the plug board 7 through the wiring hole 5 and the connecting harness 6. The control unit 14 is configured to balance the voltages between the cells in the lithium battery pack. The voltage detection module 142 is configured to measure the voltage of each cell in the lithium battery pack. The voltage divider module 141 is configured to divide the voltage of each cell with abnormal voltage, thereby preventing the abnormal cell voltage from affecting the operation of the entire battery pack. At the same time, the temperature control module 143 and the current detection module 144 can detect the output current and the surrounding temperature of each cell respectively, thereby improving the safety of the lithium battery pack.

[0033] The working principle of this embodiment: the device can carry and connect the parts of the entire device through the device shell 1. When using the device, the plug board 7 matched in the plug board matching slot 13 is pulled out, so that the connecting wire harness 6 in the harness slot 12 can be pulled out, and the end of the connecting wire harness 6 is plugged into the wiring hole 5, so that it can be electrically connected with the control unit 14. After the connecting wire harness 6 is plugged in, the plug board 7 is inserted into each monomer of the lithium battery pack, so that the electrical connection between the control unit 14 and each monomer in the lithium battery pack can be completed. The voltage detection module 142 is set to measure the voltage of each monomer in the lithium battery pack through the electrical connection between the plug board 7 and the monomer. When the monomer outputs the rated voltage, the voltage divider module 141 is set to not work. When the monomer outputs high voltage, the voltage divider module 141 can divide the voltage of each monomer with abnormal voltage, so as to avoid the abnormal monomer voltage affecting the operation of the entire battery pack. Similarly, the current detection module 144 can measure the voltage of each monomer in the lithium battery pack through the electrical connection between the plug board 7 and the monomer. The current is measured, and the temperature control module 143 detects the temperature around each monomer and the temperature of the device itself respectively, so that the versatility of the device can be improved; when the device needs to be repaired and maintained, the bottom plate 9 is rotated, and the bottom plate 9 can be rotated to open the device housing 1 through the connecting hinge 8, and the connecting bolt 16 is screwed, and the connecting bolt 16 can be unscrewed from the limit connection seat 15, so that the maintenance protection stability structure 10 and the control unit 14 can be disassembled and maintained, and the protection pressure plate 1001 can be accurately pressed on the control unit 14 through the matching of the limit card block 1002 and the limit card slot 1003. The set gap support pad 1004 can maintain a certain space gap between the protection pressure plate 1001 and the control unit 14, so as to ensure the circulation of air, and the set exhaust structure 11 can achieve the effect of heat dissipation, start the heat exhaust motor 111, and the heat exhaust motor 111 can drive the exhaust fan blade 112 to rotate, and the gap between the ventilation hole 113 and the control unit 14 bracket can achieve a better heat dissipation effect, thus completing the use process of the device for balancing the voltage between the monomers in the entire lithium battery pack.

[0034] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for balancing the voltages between cells in a lithium battery pack, comprising a device housing (1), a maintenance and protection stabilization structure (10) and a control unit (14), characterized in that: The four corners of the device housing (1) are provided with connection seats (2), and fixing bolts (3) are installed inside the connection seats (2). The upper end surface of the device housing (1) is inlaid with a display screen (4). The rear end surface of the device housing (1) is provided with a wiring hole (5), and the outer side of the wiring hole (5) is connected to a connection harness (6), and the end of the connection harness (6) is connected to a plug board (7). The bottom end of the device housing (1) is connected to a base plate (9), and the outer edge of the base plate (9) is connected to a connection hinge (8). The maintenance and protection stabilization structure (10) is installed at the bottom end of the device housing (1), and an exhaust structure (11) is provided inside the maintenance and protection stabilization structure (10). The lower end surface of the base plate (9) is provided with a harness groove (12), and the end of the harness groove (12) is connected to a plug board matching groove (13). The control unit (14) is arranged inside the device housing (1); The maintenance protection stabilization structure (10) comprises a protection plate (1001), a limit card block (1002), a limit card slot (1003) and a gap support pad (1004), and the four corners of the protection plate (1001) are all provided with a limit card block (1002), and the outer side of the limit card block (1002) is provided with a limit card slot (1003), and the upper end surface of the protection plate (1001) is provided with a gap support pad (1004); The protective pressure plate (1001) forms a snap-fit ​​structure with the device housing (1) through a limit block (1002) and a limit slot (1003), and the outer dimensions of the limit block (1002) and the limit slot (1003) match each other; The exhaust structure (11) comprises a heat exhaust motor (111), an exhaust fan blade (112) and a ventilation hole (113), wherein the output end of the heat exhaust motor (111) is connected to the exhaust fan blade (112), and the ventilation hole (113) is arranged on the outer side of the exhaust fan blade (112).

2. A device for balancing the voltages between cells in a lithium battery pack according to claim 1, characterized in that: The heat exhaust motor (111) and the exhaust fan blades (112) form a rotating structure, and the exhaust structure (11) and the control unit (14) are parallel to each other.

3. A device for balancing the voltages between cells in a lithium battery pack according to claim 1, characterized in that: The left and right ends of the control unit (14) are both provided with connecting bolts (16), and the upper ends of the connecting bolts (16) are connected to the limited position connecting seat (15).

4. A device for balancing the voltages between cells in a lithium battery pack according to claim 3, characterized in that: The connecting bolt (16) passes through the interior of the maintenance protection stabilization structure (10) and the control unit (14), and the connecting bolt (16) is threadedly connected to the limiting connection seat (15).

5. The device for balancing the voltages between cells in a lithium battery pack according to claim 1, characterized in that: The control unit (14) comprises a voltage dividing module (141), a voltage detection module (142), a temperature control module (143) and a current detection module (144), wherein the voltage dividing module (141) is provided with a voltage detection module (142) on the right side, and the temperature control module (143) is provided with a temperature control module (143) on the right side of the voltage detection module (142), and the current detection module (144) is provided with a temperature control module (143) on the right side.

6. A device for balancing the voltages between cells in a lithium battery pack according to claim 5, characterized in that: The voltage dividing module (141), the voltage detection module (142), the temperature control module (143) and the current detection module (144) are all electrically connected in parallel, and the control unit (14) is electrically connected to the plug board (7) via the wiring hole (5) and the connecting harness (6).

Images