Composite resistor for head cover of power battery
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A technology of composite resistors and power batteries, which is applied in the direction of battery covers/end covers, resistors, battery pack components, etc., can solve the problems of low test safety performance and high production costs, and achieve improved volume and mass energy density, good safety High performance and high heat resistance
Active Publication Date: 2016-11-16
东莞永蓝电子科技有限公司
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[0007] The purpose of the present invention is to provide a power battery top cover with light weight, strong plasticity, high consistency and wide resistance value range in view of the shortcomings of high production cost and low safety performance of abuse testing for existing power battery top cover resistors Using resistors can not only eliminate the potential safety hazards of batteries in abuse environments, but also effectively reduce the height and weight of the top cover, improve the volume and mass energy density of batteries, and reduce production costs
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specific Embodiment approach 1
[0025] Such as figure 1 As shown, the shape of the composite resistor 42 of the present invention is set as a circular ring, which includes a conductive component A and an insulating plastic component B, wherein the conductive component A is graphite, and its content is 40wt%; the insulating plastic component B is Polyether ether ketone, its content is 60wt%.
[0026] The manufacturing method of the composite resistor 42 is as follows: step 1, uniformly mix the conductive component A and the insulating plastic component B, and press and form it in the mold; step 2, perform ventilation treatment on the pressed composite resistor at a temperature of 30°C, The processing time is 6 hours; Step 3, then enter the drying oven for drying, the drying temperature is 80° C., and the drying time is 10 hours; that is, a composite resistor 42 with a resistance value of 200Ω, a heat-resistant temperature of 350° C., and a thickness of 0.1 mm is obtained.
[0027] Such as figure 2 As shown...
specific Embodiment approach 2
[0028]Different from Embodiment 1, the conductive component A is conductive carbon black with a content of 50wt%; the insulating plastic component B is polyimide with a content of 50wt%; the resulting resistance is 300Ω, heat-resistant A composite resistor 42 with a temperature of 350°C and a thickness of 10mm.
[0029] Others are the same as those in Embodiment 1, and will not be repeated here.
specific Embodiment approach 3
[0030] Different from Embodiment 1, the conductive component A is graphene with a content of 45wt%; the insulating plastic component B is polybenzimidazole with a content of 55wt%; 1000°C and a composite resistor 42 with a thickness of 0.01mm.
[0031] Others are the same as those in Embodiment 1, and will not be repeated here.
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Abstract
The invention belongs to the technical field of power batteries, and particularly relates to a composite resistor for a head cover of a power battery. The composite resistor comprises a conductive component A and an insulating plastic component B, wherein the resistance value of the composite resistor is 0.01-100,000ohm; and the heat-resistance temperature is greater than or equal to 150 DEG C. Compared with the prior art, the composite resistor formed by the conductive component A and the insulating plastic component B has the advantages that: on one hand, the heat-resistance temperature is high and the resistance value range is wide, so that the power battery still has good safety performance under the abuse conditions of box heating, nailing, overcharging and the like; and on the other hand, the composite resistor provided by the invention has extremely high plasticity and bending resistance in comparison with the resistor manufactured by ceramic materials of silicon carbide and the like, which are poor in consistency, high in cost, easy to break during assembly and the like, so that the composite resistor can be ground into a very thin sheet; and the height and the weight of a post terminal are reduced. Therefore, by the composite resistor, the safety performance of the power battery can be ensured and the volume energy density and the mass energy density of the battery can also be improved.
Description
technical field [0001] The invention belongs to the technical field of power batteries, in particular to a composite resistor for a power battery top cover. Background technique [0002] With the development of modern society and the enhancement of people's awareness of environmental protection, more and more devices choose to use lithium batteries as power sources, such as mobile phones, notebook computers, power tools and electric vehicles, etc., which provides a great opportunity for the application and development of lithium batteries wide open space. Among them, lithium batteries used in electric tools and electric vehicles are generally called power batteries. [0003] At present, most battery casings of power batteries are made of aluminum. In order to prevent long-term corrosion of the casing, the casing is usually made to have the same potential as the positive electrode, and a resistor is added between the positive electrode and the top cover. If metal is used fo...
Claims
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