A lithium power battery with a CID protection structure

Abstract

The present invention relates to the technical field of lithium power batteries, and in particular to a lithium power battery equipped with a CID protection structure. The technical solution comprises: an outer shell, an inner shell disposed within the outer shell, a diaphragm disposed within the inner shell, a cap assembly disposed above the inner wall of the inner shell, a bottom plate assembly disposed below the inner wall of the inner shell, the bottom plate assembly comprising a negative electrode plate, an anode plate disposed above the negative electrode plate, a thermistor disposed between the negative electrode plate and the anode plate, and an electrolyte disposed within the inner shell. The present invention can make the CID more stable during installation by arranging a mounting plate, an exhaust valve, and a conduction plate in the cap assembly. By arranging the diaphragm as a three-layer composite diaphragm, it not only has a low melting point but also has a high puncture resistance, acting as a thermal insurance, thereby improving the safety of the battery body and indirectly avoiding greater losses caused by battery damage.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium power batteries, and in particular to a lithium power battery equipped with a CID protection structure. Background Art

[0002] CID is a current cut-off device. The main function of the current cut-off device is to protect the battery when the battery cell fails. A lot of gas will be generated inside the battery, and the pressure will increase, causing the welds welded to the aluminum plate and the pressure relief plate to fall off. The pressure relief plate will flip over, causing a short circuit inside the battery cell. Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li+ is intercalated and deintercalated back and forth between the two electrodes: when charging (that is, the process of using the battery), Li+ is deintercalated from the positive electrode and intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. The lithium battery technology in the existing technology is mature, but in order to be able to better protect the battery when using the lithium battery, and at the same time enable the lithium battery to operate stably and continuously. To this end, we specially propose a lithium power battery equipped with a CID protection structure. Summary of the Invention

[0003] The purpose of the present invention is to address the problems existing in the background technology and to propose a lithium power battery equipped with a CID protection structure.

[0004] The technical solution of the present invention is as follows: A lithium power battery equipped with a CID protection structure comprises an outer shell, an inner shell is arranged in the outer shell, a diaphragm is arranged in the inner shell, a cap assembly is arranged above the inner wall of the inner shell, the cap assembly comprises a mounting plate, an exhaust valve is arranged on the inner ring of the mounting plate, a conduction plate is arranged above the exhaust valve, a positive electrode column is arranged on the conduction plate, a sealing ring is arranged on the outer ring of the positive electrode column, a bottom plate assembly is arranged below the inner wall of the inner shell, the bottom plate assembly comprises a negative electrode plate, an anode plate is arranged above the negative electrode plate, a thermistor is arranged between the negative electrode plate and the anode plate, an electrolyte is arranged in the inner shell, thionyl chloride is arranged in the inner shell between the diaphragm and the mounting plate, and a carbon material is arranged in the inner shell between the diaphragm and the thermistor.

[0005] Preferably, an axial hole is opened above the outer shell, the inner shell is installed corresponding to the outer shell, a mounting buckle is provided in the inner shell, the diaphragm is installed corresponding to the mounting buckle, and the diaphragm is a polyolefin microporous membrane.

[0006] Preferably, the outer wall of the mounting plate is in contact with the inner wall of the inner shell, a contact slot is provided on the mounting plate, the exhaust valve is installed corresponding to the contact slot, a CID is provided on one side of the exhaust valve, and the outer ring of the conduction plate is in contact with the inner wall of the inner shell.

[0007] Preferably, the outer ring of the positive electrode column is installed corresponding to the shaft hole, the sealing ring is arranged in an "I" shape, the outer ring of the sealing ring is respectively connected to a rubber pad and a connecting pad, the outer rings of the rubber pad and the connecting pad are provided with a placement clamping ring, and the placement clamping ring is provided with an installation groove, and the rubber pad, connecting pad and the installation groove are installed correspondingly.

[0008] Preferably, the outer ring of the clamping ring is fitted with the inner wall of the inner shell, and the inner ring of the clamping ring is fitted with the outer ring of the sealing ring.

[0009] Preferably, the negative plate is provided with exhaust holes, and the exhaust holes are provided in multiple groups. The anode plate is provided with heat dissipation holes, and an induction sheet is provided on one side of the anode plate.

[0010] Preferably, the outer rings of the negative plate, the anode plate and the thermistor are all in contact with the inner wall of the inner shell, and a groove is provided on the protruding surface of the anode plate.

[0011] Preferably, the shell is made of steel, the positive electrode column and the shell bottom material are mixed conductors of electrons and ions, and the electrolyte is an ion conductor.

[0012] Compared with the prior art, the present invention has the following beneficial technical effects:

[0013] 1. The present invention can make the CID more stable during installation by arranging the mounting plate, exhaust valve and conduction plate in the cap assembly. At the same time, the battery cathode can be sealed by arranging the sealing ring, rubber gasket, connecting gasket and placement clamp ring, thereby preventing the electrolyte inside the battery from volatilizing and causing damage to the battery.

[0014] 2. The present invention provides a three-layer composite membrane, which not only has a low melting point but also has high puncture resistance, thus serving as a thermal insurance.

[0015] 3. The present invention can also provide a base plate assembly and an induction sheet at the anode end of the battery to seal the battery anode while better protecting the battery cell, thereby improving the safety of the battery body and indirectly avoiding greater losses caused by battery damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 is a cross-sectional view of the present invention;

[0018] Figure 3 Schematic diagram of the internal area structure of the shell in the present invention;

[0019] Figure 4 It is a schematic diagram of the structure of part of the cap assembly in the present invention;

[0020] Figure 5 This is a schematic diagram of the exploded structure of the cap assembly in the present invention;

[0021] Figure 6 A schematic diagram of the structure of a partial area of the bottom plate assembly of the present invention;

[0022] Figure 7 Schematic diagram of the exploded structure of the bottom plate assembly of the present invention;

[0023] Figure 8 Schematic diagram of the structure of the inner shell in the present invention.

[0024] Figure numerals: 1. outer shell; 2. inner shell; 3. diaphragm; 4. cap assembly; 41. mounting plate; 42. exhaust valve; 43. conduction plate; 44. positive pole; 45. sealing ring; 46. rubber pad; 47. connecting pad; 5. bottom plate assembly; 51. negative plate; 52. anode plate; 53. thermistor; 6. mounting ring; 7. CID; 8. placement snap ring; 9. exhaust hole; 10. heat dissipation hole; 11. sensor plate; 12. groove. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0026] Example

[0027] like Figure 1-3 As shown, the present invention proposes a lithium power battery with a CID protection structure, comprising an outer shell 1, an inner shell 2 disposed inside the outer shell 1, a diaphragm 3 disposed inside the inner shell 2, an axial hole being opened above the outer shell 1, the inner shell 2 being mounted correspondingly to the outer shell 1, and the inner shell 2 being fixedly connected to the outer shell 1, as shown in FIG. Figure 8 As shown, a mounting buckle 6 is provided in the inner shell 2, one side of the mounting buckle 6 is fixedly connected to the inner wall of the inner shell 2, the diaphragm 3 is installed corresponding to the mounting buckle 6, the diaphragm 3 is fixedly connected to the inner wall of the mounting buckle 6, the diaphragm 3 is a polyolefin microporous membrane, the material of the diaphragm 3 is a composite membrane of PP and PE, the material compounding order of the diaphragm 3 is PP / PE / PP, the three-layer composite diaphragm not only has a low melting point, but also has a high puncture resistance, which plays a role in thermal insurance, the setting of the mounting buckle 6 can make the diaphragm 3 more stably placed, and a cap assembly 4 can be provided above the inner wall of the inner shell 2, as shown Figure 4-5As shown, the cap assembly 4 includes a mounting plate 41, an inner ring of the mounting plate 41 is provided with an exhaust valve 42, a conducting plate 43 is provided above the exhaust valve 42, the outer wall of the mounting plate 41 is fitted with the inner wall of the inner shell 2, the outer ring of the mounting plate 41 is fixedly connected to the inner wall of the inner shell 2, a contact slot is provided on the mounting plate 41, the exhaust valve 42 is installed corresponding to the contact slot, the lower surface of the conducting plate 43 is fitted with the upper surface of the mounting plate 41, and the conducting plate 43 and the mounting plate 41 cooperate with each other to exhaust The valve 42 is clamped in the contact slot of the mounting plate 41. A CID7 is provided on one side of the exhaust valve 42. One end of the CID7 is welded to the exhaust valve 42. The outer ring of the conduction plate 43 fits the inner wall of the inner shell 2. The outer ring of the conduction plate 43 is fixedly connected to the inner wall of the inner shell 2. The arrangement of the mounting plate 41 and the conduction plate 43 can make the exhaust valve 42 safer in a normal state. A positive pole 44 is provided on the conduction plate 43. One end of the positive pole 44 is fixedly connected to the upper surface of the conduction plate 43. The outer ring of the positive column 44 is provided with a sealing ring 45, the inner ring of the sealing ring 45 is fitted with the outer ring of the positive column 44, the outer ring of the positive column 44 is installed corresponding to the shaft hole, one end of the positive column 44 passes through the shaft hole, and the sealing ring 45 is arranged in an "I" shape. The setting of the sealing ring 45 can protect the positive column 44 and improve the safety of the positive column 44 when the lithium battery is in use. The outer ring of the sealing ring 45 is respectively connected to a rubber pad 46 and a connecting pad 47, and the outer rings of the rubber pad 46 and the connecting pad 47 are provided with A snap ring 8 is placed, and a mounting groove is provided on the snap ring 8. The rubber pad 46 and the connecting pad 47 are installed corresponding to the mounting groove. The outer ring of the snap ring 8 fits with the inner wall of the inner shell 2, and the inner ring of the snap ring 8 fits with the outer ring of the sealing ring 45. The outer ring of the snap ring 8 is fixedly connected to the inner wall of the inner shell 2. The arrangement of the snap ring 8 can cooperate with the sealing ring 45, the rubber pad 46 and the connecting pad 47 to seal the cathode end of the inner shell 2, thereby improving the overall safety of the battery.

[0028] like Figure 6-7As shown, a bottom plate assembly 5 is provided below the inner wall of the inner shell 2, and the bottom plate assembly 5 includes a negative plate 51, and the outer ring of the negative plate 51 is fixedly connected to the inner wall of the inner shell 2. An anode plate 52 is provided above the negative plate 51, and the outer ring of the anode plate 52 is fixedly connected to the inner wall of the inner shell 2. An exhaust hole 9 is provided on the negative plate 51, and there are multiple groups of exhaust holes 9. The setting of the exhaust holes 9 can better dissipate heat for the battery, thereby further improving the safety of the battery. A heat dissipation hole 10 is provided on the anode plate 52, and the heat dissipation hole 10 can lead out the heat generated inside the battery for better heat dissipation. An induction sheet 11 is provided on one side of the anode plate 52, and one end of the induction sheet 11 is soldered to the anode plate 52. A thermistor 53 is provided between the negative plate 51 and the anode plate 52. The upper and lower sides of the resistor 53 are respectively in contact with the negative plate 51 and the anode plate 52. The outer circles of the negative plate 51, the anode plate 52 and the thermistor 53 are all in contact with the inner wall of the inner shell 2. The protruding surface of the anode plate 52 is provided with a groove 12. The provision of the induction sheet 11 prevents the battery cell from continuing to discharge at high temperatures, better protects the safety of the battery cell, and thus greatly improves the overall safety of the battery. An electrolyte is provided in the inner shell 2, and the electrolyte is an ion conductor. Thionyl chloride is provided in the inner shell 2 between the diaphragm 3 and the mounting plate 41, and a carbon material is provided in the inner shell 2 between the diaphragm 3 and the thermistor 53. The outer shell 1 is made of steel. The positive electrode column 44 and the bottom material of the outer shell 1 are mixed conductors of electrons and ions, thereby satisfying the formation current of the lithium battery for output use.

[0029] In this embodiment, the diaphragm 3 is provided to separate the upper and lower layers of dust inside the battery. The upper portion of the diaphragm 3 is the battery cathode, and the lower portion of the diaphragm 3 is the battery anode. The cathode of the battery is sealed by providing a positive electrode column 44, a sealing ring 45, a rubber pad 46, a connecting pad 47, and a retaining ring 8 to prevent leakage of the battery and volatilization of the electrolyte in the battery. At the same time, the battery body is protected by installing a mounting plate 41, an exhaust valve 42, and a conductive plate 43 inside the battery. When the temperature inside the battery is too high, the battery cell is overcurrent at high temperature, overcharged, or short-circuited externally, the internal air pressure increases. When it reaches a certain value, the CID 7 is opened by the air pressure. When the exhaust valve 42 is disconnected, 0V and no output will appear on the outside of the battery cell, and CID7 cannot be restored, thereby protecting the battery. At the same time, a bottom plate assembly 5 is set at the anode of the battery, and the negative plate 51 and the anode plate 52 in the bottom plate assembly 5 are used to seal the bottom of the battery. The temperature inside the battery cell is sensed by the setting of the groove 12. When the current inside the battery cell is too large or an external short circuit occurs, the internal temperature rises and the resistance of the sensor 11 becomes larger. To the outside, the battery cell is equivalent to a short circuit and no output; when the temperature drops, the resistance recovers and the battery cell resumes normal output, so that the battery can output more stably, thereby further improving the overall safety of the battery.

[0030] The above specific embodiment is only a preferred embodiment of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above embodiment, those skilled in the art can make various alternative improvements and combinations to the above specific embodiment.

Claims

1. A lithium power battery configured with a CID protection structure, comprising a housing (1), characterized in that: An inner shell (2) is provided in the outer shell (1), a diaphragm (3) is provided in the inner shell (2), a cap assembly (4) is provided above the inner wall of the inner shell (2), the cap assembly (4) comprises a mounting plate (41), an exhaust valve (42) is provided on the inner ring of the mounting plate (41), a conduction plate (43) is provided above the exhaust valve (42), a positive pole (44) is provided on the conduction plate (43), and a sealing ring (45) is provided on the outer ring of the positive pole (44). A bottom plate assembly (5) is provided below the inner wall of the inner shell (2), the bottom plate assembly (5) comprising a negative plate (51), an anode plate (52) provided above the negative plate (51), a thermistor (53) provided between the negative plate (51) and the anode plate (52), an electrolyte provided in the inner shell (2), thionyl chloride provided in the inner shell (2) between the diaphragm (3) and the mounting plate (41), and a carbon material provided in the inner shell (2) between the diaphragm (3) and the thermistor (53); The outer wall of the mounting plate (41) fits in with the inner wall of the inner shell (2), a contact slot is provided on the mounting plate (41), the exhaust valve (42) is installed corresponding to the contact slot, a CID (7) is provided on one side of the exhaust valve (42), the outer ring of the conduction plate (43) fits in with the inner wall of the inner shell (2), the outer ring of the positive pole (44) is installed corresponding to the shaft hole, the sealing ring (45) is provided in an "I" shape, the outer ring of the sealing ring (45) is connected with a rubber pad (46) and a connecting pad (47) respectively, the outer rings of the rubber pad (46) and the connecting pad (47) are provided with a placement snap ring (8), the placement snap ring (8) has a mounting groove, and the rubber pad (46) and the connecting pad (47) are installed corresponding to the mounting groove; The negative plate (51) is provided with exhaust holes (9), and the exhaust holes (9) are provided in multiple groups. The anode plate (52) is provided with heat dissipation holes (10), and an induction sheet (11) is provided on one side of the anode plate (52).

2. The lithium power battery configured with a CID protection structure according to claim 1, characterized in that: An axial hole is provided above the outer shell (1); the inner shell (2) is mounted correspondingly to the outer shell (1); a mounting buckle (6) is provided in the inner shell (2); the diaphragm (3) is mounted correspondingly to the mounting buckle (6); and the diaphragm (3) is a polyolefin microporous membrane.

3. The lithium power battery configured with a CID protection structure according to claim 1, characterized in that: The outer ring of the placement clamp ring (8) fits in contact with the inner wall of the inner shell (2), and the inner ring of the placement clamp ring (8) fits in contact with the outer ring of the sealing ring (45).

4. The lithium power battery configured with a CID protection structure according to claim 1, characterized in that: The outer rings of the negative plate (51), the anode plate (52) and the thermistor (53) are all in contact with the inner wall of the inner shell (2), and the convex surface of the anode plate (52) is provided with a groove (12).

5. The lithium power battery configured with a CID protection structure according to claim 1, characterized in that: The shell (1) is made of steel, the positive electrode column (44) and the bottom material of the shell (1) are mixed conductors of electrons and ions, and the electrolyte is an ion conductor.

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