Battery
By setting an NTC thermistor on the battery pole, the Joule thermal effect is used to increase the internal resistance and heat up at low temperatures, the problem of reducing the discharge capacity of the battery at low temperatures is solved, and the normal use and battery life of the battery in a low temperature environment is achieved.
Patent Information
- Application Number
- CN202422250121.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-13
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-09-13
AI Technical Summary
Existing batteries are difficult to use normally in low temperature environments, resulting in a greatly reduced discharge capacity and affecting the use time.
Set an NTC thermistor on the pole of the battery to increase the internal resistance and heat at low temperatures through the Joule thermal effect, generating heat to increase the battery temperature and ensure that the battery is discharged normally in a low temperature environment.
Through the use of NTC thermistor, the battery can maintain normal discharge capacity in low temperature environments, improving battery life.
Smart Images
Figure CN223181225U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of energy storage devices, and particularly relates to a battery. Background Art
[0002] With the increasing popularity of new energy batteries, batteries are used more and more widely globally, and the demand for normal use of batteries under extreme temperatures is getting higher and higher.
[0003] When the battery is used at low temperature, affected by the negative electrode impedance, the discharge capacity of the battery will be greatly reduced, affecting the service life of the battery. It can be seen that the existing batteries are difficult to be used normally in a low-temperature environment. Summary of the Invention
[0004] The technical problem to be solved by the utility model is: aiming at the problem that the existing batteries are difficult to be used normally in a low-temperature environment, a battery is provided.
[0005] To solve the above technical problem, an embodiment of the utility model provides a battery, including a housing, a core and an ear. The core and the ear are arranged in the housing. The core includes a pole piece and an NTC thermistor. An empty foil area is arranged on the pole piece. The NTC thermistor is arranged in the empty foil area. The ear is arranged on the NTC thermistor. The NTC thermistor is electrically connected to the empty foil area and the ear respectively.
[0006] Optionally, the NTC thermistor is an NTC thermistor coating; or, the NTC thermistor is an NTC thermistor block.
[0007] Optionally, the surface of the NTC thermistor far from the empty foil area is flush with the surface of the active layer on the pole piece far from the empty foil area.
[0008] Optionally, the thickness direction of the NTC thermistor is the same as the thickness direction of the pole piece, and the thickness of the NTC thermistor is 20 - 100 um.
[0009] Optionally, the length direction of the NTC thermistor, the width direction of the ear and the length direction of the pole piece are parallel; the length of the NTC thermistor is greater than the width of the ear, and the length of the NTC thermistor is less than the length of the empty foil area.
[0010] Optionally, the length of the NTC thermistor is c, the width of the ear is d, and the value of c is 3 - 4 times the value of d.
[0011] Optionally, the width of the NTC thermistor is equal to the width of the pole piece.
[0012] Optionally, the electrode core is a cylindrical wound core, there are two empty foil areas, the two empty foil areas are arranged at intervals, one NTC thermistor is arranged in each empty foil area, and one tab is arranged on each NTC thermistor;
[0013] The length of the connection line between the midpoints of the lengths of the two tabs is L1, the diameter of the electrode core is D1, and L1 / D is 0.25 - 0.5.
[0014] Optionally, the electrode core is a wound core, the electrode core includes a quadrangular prism block and a first arc block and a second arc block arranged on opposite sides of the quadrangular prism block, the first arc block, the quadrangular prism block and the second arc block are arranged along a first direction, the first direction is the length direction of the electrode core, there are two empty foil areas, the two empty foil areas are arranged at intervals, one NTC thermistor is arranged in each empty foil area, and one tab is arranged on each NTC thermistor;
[0015] The length of the electrode core is D2, the length of the connection line between the midpoints of the lengths of the two tabs is L2, and L2 / D2 is 0.25 - 0.5.
[0016] Optionally, the width of the electrode tab is 2.5 - 16 mm; the length of the NTC thermistor is 4 - 20 mm; the width of the tab is 1.5 - 5 mm; the length of the connection line between the two tabs is 10 - 30 mm.
[0017] For the battery according to the embodiment of the present invention, the NTC thermistor is a negative temperature coefficient induction resistor, and its internal resistance will increase as the temperature decreases. When facing a low-temperature environment, the resistance value of the NTC thermistor increases, making the internal resistance of the battery further increase. In the initial stage of battery discharge, according to the Joule heat formula Q = I2Rt, the battery will generate heat, thereby generating more heat to help the overall temperature of the battery rise. As the temperature inside the battery increases, the NTC thermistor returns to its normal resistance value, and the battery can discharge as if it were in a normal environment, thereby ensuring that although the battery is in a low-temperature environment, it can still operate in a normal state as in a normal environment, improving the battery's endurance in low temperatures. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a front view schematic diagram of the electrode tab and the tab of the battery provided by an embodiment of the present invention;
[0019] Figure 2 It is a top view schematic diagram of the electrode tab and the tab of the battery provided by an embodiment of the present invention;
[0020] Figure 3 It is a position schematic diagram of the tab and the electrode core of the battery provided by an embodiment of the present invention;
[0021] Figure 4 Schematic diagram of the relative positions of the tab and the electrode core of the battery provided by an embodiment of the present invention.
[0022] The reference numerals in the specification are as follows: 1, electrode plate; 11, foil; 12, active layer; 13, empty foil area; 2, NTC thermistor; 3, tab. Detailed implementation manners
[0023] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0024] As Figures 1 to 4 shown, an embodiment of the present invention provides a battery, including a housing, an electrode core and a tab 3. The electrode core includes an electrode plate 1 and an NTC thermistor 2. An empty foil area 13 is provided on the electrode plate 1. The NTC thermistor 2 is arranged in the empty foil area 13. The tab 3 is arranged on the NTC thermistor 2. The NTC thermistor 2 is electrically connected to the empty foil area 13 and the tab 3 respectively; the electrode core and the tab 3 are arranged in the housing.
[0025] The NTC thermistor 2 is a negative temperature coefficient induction resistor, and its internal resistance will increase as the temperature decreases. When facing low temperature, the resistance value of the NTC thermistor 2 increases, making the internal resistance of the battery further increase. In the initial stage of battery discharge, according to the Joule heat formula Q = I2Rt, the battery will generate heat, thus generating more heat to help the overall temperature of the battery rise. As the temperature inside the battery increases, the NTC thermistor 2 returns to its normal resistance value, and the battery can discharge as if it were in a normal environment, thereby ensuring that although the battery is in a low temperature environment, it can still function normally in a normal environment, improving the battery's endurance in low temperature.
[0026] In this embodiment, the NTC thermistor 2 is an NTC thermistor block. The NTC thermistor block in this embodiment is a ready-made finished resistor, and is connected to the tab 3 and the empty foil area 13 respectively by welding.
[0027] In this embodiment, the surface of the NTC thermistor away from the empty foil area 13 is flush with the surface of the active layer 12 on the electrode plate 1 away from the empty foil area 13.
[0028] As an example, the thickness direction of the NTC thermistor 2 is the same as the thickness direction of the electrode 1, and the thickness of the NTC thermistor 2 is 20-100um. The electrode 1 in this embodiment includes a foil 11 and an active layer 12 provided on both sides of the foil 11. As in the prior art, the electrode 1 is composed of a foil 11 and an active layer 12 coated on the surface of the foil 11. The empty foil area 13 is formed by scraping off a portion of the active layer 12 on the surface of the foil 11. The thickness of the NTC thermistor 2 is equal to the thickness of the active layer 12 on one side of the foil 11. Limiting the thickness of the NTC thermistor 2 is mainly used to reduce the excessive increase in the size of the battery caused by an overly thick NTC thermistor 2.
[0029] As an example, the length direction of the NTC thermistor 2, the width direction of the pole ear 3 and the length direction of the pole piece 1 are parallel; the length of the NTC thermistor 2 is greater than the width of the pole ear 3, and the length of the NTC thermistor is less than the length of the empty foil area 13.
[0030] In this embodiment, the width of electrode piece 1 is equal to the width of the NTC thermistor, which ranges from 2.5 to 16 mm. In actual production, the width of electrode piece 1 is the same as the width of the NTC thermistor. This arrangement ensures that the tab does not contact the bare foil. If the width of the NTC thermistor 2 is smaller than the electrode piece width, contact will occur, and the NTC will not function. If the width of the NTC thermistor 2 is larger than the electrode piece width, the energy density will be reduced.
[0031] As an example, the length of the NTC thermistor 2 is c, the width of the tab 3 is d, and the value of c is 3-4 times the value of d. The length of the NTC thermistor 2 is 4-20 mm, and the width of the tab 3 is 1.5-5 mm.
[0032] The NTC thermistor 2 covers the empty foil area 13 in the width direction of the electrode 1 and is 3-4 times the width d of the electrode tab 3 in the length direction of the electrode 1. The above arrangement can avoid direct contact between the electrode tab 3 and the foil as much as possible, which may lead to mechanical failure of the NTC thermistor 2.
[0033] Reference Figure 3, in one embodiment, the core is a cylindrical wound core, there are two empty foil areas 13, the two empty foil areas 13 are arranged at intervals, one NTC thermistor 2 is arranged in each empty foil area 13, and one tab 3 is arranged on each NTC thermistor 2. Wherein, the length of the line connecting the midpoints of the lengths of the two tabs 3 is L1, the diameter of the core is D1, and the ratio of L1 / D1 is 0.25 - 0.5. In this embodiment, the ratio of L1 / D1 is generally 1 / 3.
[0034] The tabs 3 on the wound core should be evenly distributed on both sides of the cross-section of the wound core. The reasonable distribution of the tabs 3 can make the heat generated by the NTC thermistor 2 evenly dispersed to the wound core, accelerating the temperature rise of the wound core and even the battery. It should be avoided that the tabs 3 are stacked in the same area or adjacent areas of the wound core to avoid the occurrence of unfavorable heat dissipation phenomena. Therefore, in the cylindrical wound core, the tabs 3 are arranged at the above positions in this embodiment. Specifically, the length of the line connecting the two tabs 3 is 10 - 30 mm.
[0035] Refer to Figure 4 , similarly to the cylindrical battery cell, in another embodiment, the core is a wound core, the core includes a quadrangular prism block and a first arc block and a second arc block arranged on opposite sides of the quadrangular prism block, and the first arc block, the quadrangular prism block and the second arc block are arranged along a first direction, and the first direction is the length direction of the core. In other words, the core in this embodiment is formed by winding electrode sheets. The wound core is artificially divided into a quadrangular prism block and a first arc block and a second arc block arranged on opposite sides of the quadrangular prism block according to its own shape, but in fact, the quadrangular prism block, the first arc block and the second arc block are formed by winding electrode sheets. The length of the core is D2, there are two empty foil areas 13, the two empty foil areas 13 are arranged at intervals, one NTC thermistor 2 is arranged in each empty foil area 13, and one tab 3 is arranged on each NTC thermistor 2. The length of the line connecting the midpoints of the lengths of the two tabs 3 is L2, and L2 / D2 is 0.25 - 0.5. In this embodiment, L2 / D2 is generally 1 / 3. Specifically, the length of the line connecting the two tabs 3 is 10 - 30 mm.
[0036] The battery described in this embodiment can be a soft-pack battery or a battery with a metal casing.
[0037] In other embodiments, the NTC thermistor 2 is an NTC thermistor coating; the thickness of the NTC thermistor coating is equal to the thickness on one side surface of the foil 11.
[0038] In other embodiments, the number of NTC thermistors 2 and the number of tabs 3 can be increased or decreased according to the temperature difference of the battery cell during use. For example, four empty foil areas 13 can be arranged on the electrode sheet 1, and four thermistors and tabs 3 can be arranged.
[0039] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A battery, characterized in that, It includes a housing, a pole core, and a pole ear (3). The pole core and the pole ear (3) are arranged inside the housing. The pole core includes a pole piece (1) and an NTC thermistor (2). An empty foil area (13) is arranged on the pole piece (1), and the NTC thermistor (2) is arranged inside the empty foil area (13). The pole ear (3) is arranged on the NTC thermistor (2), and the NTC thermistor (2) is electrically connected to the empty foil area (13) and the pole ear (3) respectively.
2. The battery according to claim 1, wherein the NTC thermistor (2) is an NTC thermistor coating; or the NTC thermistor (2) is an NTC thermistor block.
3. The battery according to claim 2, wherein, The surface of the NTC thermistor (2) far from the empty foil area (13) is flush with the surface of the active layer (12) on the pole piece (1) far from the empty foil area (13).
4. The battery according to claim 3, characterized in that, The thickness direction of the NTC thermistor (2) is the same as the thickness direction of the pole piece (1), and the thickness of the NTC thermistor (2) is 20 - 100 um.
5. The battery according to claim 1, wherein The length direction of the NTC thermistor (2), the width direction of the pole ear (3), and the length direction of the pole piece (1) are parallel; the length of the NTC thermistor (2) is greater than the width of the pole ear (3), and the length of the NTC thermistor is less than the length of the empty foil area (13).
6. The battery according to claim 5, characterized in that, The length of the NTC thermistor (2) is c, the width of the pole ear (3) is d, and the value of c is 3 - 4 times the value of d.
7. The battery according to claim 5, characterized in that, The width of the NTC thermistor (2) is equal to the width of the pole piece (1).
8. The battery according to claim 7, characterized in that, The pole core is a cylindrical wound core. There are two empty foil areas (13) which are arranged at intervals. One NTC thermistor (2) is arranged inside each empty foil area (13), and one pole ear (3) is arranged on each NTC thermistor (2); The length of the connection line between the mid - points of the lengths of the two pole ears (3) is L1, the diameter of the pole core is D1, and L1 / D is 0.25 - 0.
5.
9. The battery according to claim 7, wherein The pole core is a wound core. The pole core includes a quadrangular prism block and a first arc block and a second arc block arranged on opposite sides of the quadrangular prism block. The first arc block, the quadrangular prism block, and the second arc block are arranged along the first direction, and the first direction is the length direction of the pole core. There are two empty foil areas (13) which are arranged at intervals. One NTC thermistor (2) is arranged inside each empty foil area (13), and one pole ear (3) is arranged on each NTC thermistor (2); The length of the pole core is D2, the length of the connection line between the mid - points of the lengths of the two pole ears (3) is L2, and L2 / D2 is 0.25 - 0.
5.
10. The battery according to claim 8 or 9, characterized in that, The width of the pole piece (1) is 2.5 - 16 mm; the length of the NTC thermistor (2) is 4 - 20 mm; the width of the pole ear (3) is 1.5 - 5 mm; the length of the connection line between the two pole ears (3) is 10 - 30 mm.