Heating control method and heating control device for battery structure, and battery system

1. A heating control method for a battery structure, comprising steps as follows:

S 10 , detecting a temperature value T of the battery structure;

S 20 , judging whether the temperature value T meets a first heating condition, and if the temperature value T meets the first heating condition, going to step S 30 , wherein the first heating condition is: the temperature value T is smaller than a first predetermined temperature value T 1 , and the first predetermined temperature value T 1 is smaller than an upper limit temperature value T 0 ;

S 30 , forming a short circuit between a positive electrode terminal of the battery structure and a negative electrode terminal of the battery structure, so as to heat the battery structure using heat generated by a short circuit current and decrease a difference between an internal temperature and an external temperature of the battery structure;

S 35 , detecting a voltage value V of the battery structure while the short circuit between the positive electrode terminal and the negative electrode terminal is in place;

S 40 , judging whether the temperature value T meets a second heating condition and judging whether the voltage value V meets the second heating condition, and if at least one of the temperature value T or the voltage vale V meets the second heating condition, going to step S 50 ; and

S 50 , activating an external heating device to heat the battery structure.

2. The heating control method for a battery structure according to claim 1 , wherein the second heating condition is: the temperature value T is greater than or equal to the first predetermined temperature value T 1 and is smaller than the upper limit temperature value T 0 , or the voltage value V is smaller than or equal to a predetermined voltage value V 0 .

3. The heating control method for a battery structure according to claim 1 , wherein the step of activating an external heating device to heat the battery structure comprises: heating a phase change material with the external heating device, the phase change material contacting the battery structure, so that heat from the external heating device heats the battery structure by way of the phase change material.

4. The heating control method for a battery structure according to claim 3 , after step S 50 , further comprising steps as follows:

S 60 , detecting a temperature value T 2 of the phase change material; and

S 70 , when the temperature value T 2 of the phase change material is greater than a phase change temperature value T 3 of the phase change material, or the temperature value T 2 of the phase change material is greater than the upper limit temperature value T 0 , stop heating the battery structure.

5. A heating control device, comprising:

a first detecting unit, configured to detect a temperature value T of a battery structure;

a first judging unit, configured to judge whether the temperature value T meets a first heating condition, wherein the first heating condition is: the temperature value T is smaller than a first predetermined temperature value T 1 , and the first predetermined temperature value T 1 is smaller than an upper limit temperature value T 0 ; and

a controlling unit, programmed to, upon the temperature value T meeting the first heating condition, control formation of a short circuit between a positive electrode terminal of the battery structure and a negative electrode terminal of the battery structure, so as to heat the battery structure using heat generated by the short circuit current and decrease a difference between an internal temperature and an external temperature of the battery structure; and

a second detecting unit configured to detect a voltage value V of the battery structure while the short circuit between the positive electrode terminal and the negative electrode terminal is in place; and

wherein the controlling unit is further programmed to judge whether the temperature value T meets a second heating condition and judge whether the voltage value V meets the second heating condition, and if at least one of the temperature value T or the voltage vale V meets the second heating condition, activate an external heating device to heat the battery structure.

6. The heating control device according to claim 5 , the battery structure being associated with the external heating device, wherein the external heating device is separated from the battery structure by a phase change material, the heating control device further programmed to:

detect a temperature value T 2 of the phase change material;

whether the temperature value T 2 of the phase change material is greater than an upper limit temperature value T 0 or is greater than a phase change temperature value T 3 of the phase change material; and

upon detection that the temperature value T 2 of the phase change material is greater than the upper limit temperature value T 0 or is greater than the phase change temperature value T 3 , deactivate the external heating device to stop heating the battery structure.

7. A battery system, comprising a battery structure, a heating assembly, and the heating control device according to claim 5 , wherein the heating control device is electrically connected with the heating assembly and the battery structure to form a control circuit, and the heating assembly is configured to heat the battery structure under control of the heating control device.

8. The battery system according to claim 7 , wherein the heating assembly comprises a heater, and a resistance of the heater increases as a temperature of the heater increases.

9. The battery system according to claim 8 , wherein the heating assembly further comprises a phase change material, the heater contacts with the phase change material, the phase change material is capable of changing phase at a phase change temperature, and heat generated by the heater is conducted to the battery structure via the phase change material.

10. The battery system according to claim 9 , wherein the phase change material comprises an accommodating cavity, and the heater is accommodated in the accommodating cavity.