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JP-7857498-B2 - Battery self-heating system and vehicle

JP7857498B2JP 7857498 B2JP7857498 B2JP 7857498B2JP-7857498-B2

Inventors

  • イェン、レイ
  • カオ、ウェン
  • チャン、チュンウェイ
  • ソン、カン

Assignees

  • ビーワイディー カンパニー リミテッド

Dates

Publication Date
20260512
Application Date
20230425
Priority Date
20220831

Claims (10)

  1. A battery self-heating system applied to a vehicle, wherein the system is A power battery pack (21), wherein the power battery pack (21) comprises a first battery pack (E1) and a second battery pack (E2) connected in series, The first heating module (22) comprises a first heating submodule (221) and a second heating submodule (222), wherein the first and second connection terminals of the first heating submodule (221) are connected to the positive and negative terminals of the first battery pack (E1), respectively, the first and second connection terminals of the second heating submodule (222) are connected to the positive and negative terminals of the first battery pack (E1), respectively, and the third connection terminal of the first heating submodule (221) is connected to the third connection terminal of the second heating submodule (222). The second heating module (23) comprises a third heating submodule (231) and a fourth heating submodule (232), wherein the first and second connection terminals of the third heating submodule (231) are connected to the positive and negative terminals of the second battery pack (E2), respectively, the first and second connection terminals of the fourth heating submodule are connected to the positive and negative terminals of the second battery pack (E2), respectively, and the third connection terminal of the third heating submodule (231) is connected to the third connection terminal of the fourth heating submodule (232). A system comprising a controller (24) connected to the first heating module (22) and the second heating module (23), wherein the controller (24) controls the first heating module (22) and the first battery pack (E1) to alternately charge and discharge, controls the second heating module (23) and the second battery pack (E2) to alternately charge and discharge, and controls one of the first battery pack (E1) and the second battery pack (E2) to be in a charging state when the other of the first battery pack (E1) and the second battery pack (E2) is in a discharge state.
  2. The first heating submodule (221) comprises a first heating winding (31) and a first switch (32), the second heating submodule (222) comprises a second heating winding (33) and a second switch (34), the first switch (32) comprises a first upper switch (321) and a first lower switch (322) connected in series, the second switch (34) comprises a second upper switch (341) and a second lower switch (342) connected in series, the first upper switch (321) is connected to the positive terminal of the first battery pack (E1), and the first lower switch (322) is connected to the first battery The first heating winding (31) is connected to the negative terminal of the re-pack (E1), the first end of the first heating winding (31) is connected to the connection point between the first upper switch (321) and the first lower switch (322), the second end of the first heating winding (31) is connected to the first end of the second heating winding (33), the second end of the second heating winding (33) is connected to the connection point between the second upper switch (341) and the second lower switch (342), the second upper switch (341) is connected to the positive terminal of the first battery pack (E1), and the second lower switch (342) is connected to the negative terminal of the first battery pack (E1). The third heating submodule (231) comprises a third heating winding (35) and a third switch (36), the fourth heating submodule (232) comprises a fourth heating winding (37) and a fourth switch (38), the third switch (36) comprises a third upper switch (361) and a third lower switch (362) connected in series, the fourth switch (38) comprises a fourth upper switch (381) and a fourth lower switch (382) connected in series, the third upper switch (361) is connected to the positive terminal of the second battery pack (E2), and the third lower switch (362) is connected to the second battery pack (E2). The system according to claim 1, wherein the first end of the third heating winding (35) is connected to the negative terminal of the second battery pack (E2), the second end of the third heating winding (35) is connected to the first end of the fourth heating winding (37), the second end of the fourth heating winding (37) is connected to the connection point between the fourth upper switch (381) and the fourth lower switch (382), the fourth upper switch (381) is connected to the positive terminal of the second battery pack (E2), and the fourth lower switch (382) is connected to the negative terminal of the second battery pack (E2).
  3. The first heating winding (31) is a multiphase winding of the first drive motor (1) of the vehicle, the first switch (32) is a first multiphase inverter in the first drive motor controller (2) corresponding to the first drive motor (1), the first upper switch (321) represents the upper bridge arm of the first multiphase inverter, and the first lower switch (322) represents the lower bridge arm of the first multiphase inverter. The second heating winding (33) is a multiphase winding of the second drive motor (3) of the vehicle, the second switch (34) is a second multiphase inverter in the second drive motor controller (4) corresponding to the second drive motor (3), the second upper switch (341) represents the upper bridge arm of the second multiphase inverter, and the second lower switch (342) represents the lower bridge arm of the second multiphase inverter. The third heating winding (35) is a multiphase winding of the third drive motor (5) of the vehicle, the third switch (36) is a third multiphase inverter in the third drive motor controller (6) corresponding to the third drive motor (5), the third upper switch (361) represents the upper bridge arm of the third multiphase inverter, and the third lower switch (362) represents the lower bridge arm of the third multiphase inverter. The system according to claim 2, wherein the fourth heating winding (37) is a multiphase winding of the fourth drive motor (7) of the vehicle, the fourth switch (38) is a fourth multiphase inverter in the fourth drive motor controller (8) corresponding to the fourth drive motor (7), the fourth upper switch (381) represents the upper bridge arm of the fourth multiphase inverter, and the fourth lower switch (382) represents the lower bridge arm of the fourth multiphase inverter.
  4. The controller (24) is configured to, in a first preset state, control the upper bridge arm of the first polyphase inverter to be turned on, control the lower bridge arm of the second polyphase inverter to be turned on, thereby discharging the first battery pack (E1), thereby energizing the first heating winding (31) and the second heating winding (33), control the lower bridge arm of the third polyphase inverter to be turned on, control the upper bridge arm of the fourth polyphase inverter to control the third heating winding ( 35 ) and the fourth heating winding ( 37 ), thereby charging the second battery pack (E2). The system according to claim 3, wherein the controller (24) is configured to control the lower bridge arm of the first polyphase inverter to be turned on and the upper bridge arm of the second polyphase inverter to be turned on in a second preset state, thereby controlling the first heating winding (31) and the second heating winding (33) to charge the first battery pack (E1), and to control the upper bridge arm of the third polyphase inverter to be turned on and the lower bridge arm of the fourth polyphase inverter to be turned on, thereby discharging the second battery pack (E2), thereby energizing the third heating winding ( 35 ) and the fourth heating winding ( 37 ).
  5. The system according to claim 4, wherein the controller (24) is further configured to control, in both the first preset state and the second preset state , the ratio of the current flowing through the first battery pack (E1) to the current flowing through the second battery pack (E2) is equal to the ratio of the resistance of the second battery pack (E2) to the resistance of the first battery pack (E1).
  6. The system further comprises a first changeover switch (K1), a second changeover switch (K2), a third changeover switch (K3), and a fourth changeover switch (K4), wherein both the third changeover switch (K3) and the fourth changeover switch (K4) are two-position switches. The first changeover switch (K1) is located in the connection circuit between the first heating winding (31) and the second heating winding (33). The second changeover switch (K2) is located in the connection circuit between the third heating winding (35) and the fourth heating winding (37). The fixed contact of the third changeover switch (K3) is connected to the connection terminal between the lower bridge arm of the first multiphase inverter and the lower bridge arm of the second multiphase inverter, the first movable contact of the third changeover switch (K3) is connected separately to the negative terminal of the first battery pack (E1) and the positive terminal of the second battery pack (E2), and the second movable contact of the third changeover switch (K3) is connected to the negative terminal of the second battery pack (E2). The fixed contact of the fourth changeover switch (K4) is connected to the connection end between the upper bridge arm of the third multiphase inverter and the upper bridge arm of the fourth multiphase inverter, the first movable contact of the fourth changeover switch (K4) is connected to the positive terminal of the first battery pack (E1), and the second movable contact of the fourth changeover switch (K4) is connected separately to the negative terminal of the second battery pack (E1) and the positive terminal of the second battery pack (E2). The system according to claim 3, wherein the first changeover switch (K1), the second changeover switch (K2), the third changeover switch (K3), and the fourth changeover switch (K4) are connected to the controller (24), and the controller (24) is configured to control the first changeover switch (K1) and the second changeover switch (K2) to be turned on, to control the fixed contact of the third changeover switch (K3) to be connected to the first movable contact of the third changeover switch (K3), and to control the fixed contact of the fourth changeover switch (K4) to be connected to the second movable contact of the fourth changeover switch (K4), thereby enabling the first battery pack (E1) and the second battery pack (E2) to self-heat.
  7. The controller (24) is further configured to control the first changeover switch (K1) and the second changeover switch (K2) to be turned off, to connect the fixed contact of the third changeover switch (K3) to the second movable contact of the third changeover switch (K3), and to connect the fixed contact of the fourth changeover switch (K4) to the first movable contact of the fourth changeover switch (K4), thereby controlling the first battery pack (E1) and the second battery pack (E2) to supply power to the first drive motor (1), the second drive motor (3), the third drive motor (5), and the fourth drive motor (7), and thereby to drive the vehicle. The system according to claim 6.
  8. The device further comprises a first charging switch (K5) and a second charging switch (K6), The first charging switch (K5) is located in the connection circuit between the vehicle's charging port and the positive terminal of the first battery pack (E1). The second charging switch (K6) is located in the connection circuit between the charging port of the vehicle and the negative terminal of the second battery pack (E2). The system according to claim 6, wherein the controller (24) is further configured to charge the power battery pack (21) while the first battery pack (E1) and the second battery pack (E2) self-heat when the vehicle is connected to a charging pile.
  9. The system according to claim 8, further configured such that when the vehicle is connected to the charging pile, the controller (24) controls the first charging switch (K5) and the second charging switch (K6) to be turned on, and controls the third changeover switch (K3) and the fourth changeover switch (K4) such that the fixed contact (a) of the third changeover switch (K3) is not connected to either the first movable contact (b) or the second movable contact (c) of the third changeover switch (K3), and the fixed contact (a) of the fourth changeover switch (K4) is not connected to either the first movable contact (b) or the second movable contact (c) of the fourth changeover switch (K4), thereby charging the power battery pack (21).
  10. A vehicle comprising the battery self-heating system described in any one of claims 1 to 9.

Description

Cross-reference of related applications This disclosure claims priority to Chinese Patent Application No. 202211071491.X, entitled “BATTERY SELF-HEATING SYSTEM AND VEHICLE,” filed on 31 August 2022. The entire contents of the above-referenced application are incorporated herein by reference. This disclosure relates to electric vehicle technology, specifically to battery self-heating systems and vehicles. In response to energy conservation and emission reduction, electric vehicles are attracting increasing attention. When electric vehicles are in low-temperature environments, the activity of the battery's positive and negative electrode materials, as well as the activity of the electrolyte within the battery, decreases due to the low temperature, resulting in a significant reduction in the battery's charge and discharge performance. To ensure power supply in electric vehicles in low-temperature environments, the electric vehicle's battery may be heated to raise the battery body temperature to ensure charge and discharge performance. In conventional technology, battery heating is achieved by alternating charge and discharge between the battery pack and the energy storage element. However, this charge and discharge process results in large fluctuations in the battery pack's terminal voltage. This is a schematic diagram of a conventional battery self-heating circuit.This is a schematic diagram of a battery self-heating system according to one embodiment of the present disclosure.This is a schematic diagram of another battery self-heating system according to one embodiment of the present disclosure.This is a schematic diagram of another battery self-heating system according to one embodiment of the present disclosure.This is a circuit diagram of a battery self-heating system according to one embodiment of the present disclosure.This is a schematic diagram of the current direction when a battery self-heating system according to one embodiment of the present disclosure is in operation.This is a schematic diagram of the current direction when another battery self-heating system according to one embodiment of the present disclosure is in operation.This is a circuit diagram of another battery self-heating system according to one embodiment of the present disclosure.This is a schematic diagram of the current direction when another battery self-heating system according to one embodiment of the present disclosure is in operation.This is a schematic diagram of the current direction when another battery self-heating system according to one embodiment of the present disclosure is in operation. The following describes specific embodiments of this disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are used solely for the purpose of describing and illustrating this disclosure and are not intended to limit it. It should be understood that the steps recorded in the embodiments of the method in this disclosure may be performed in different orders and/or in parallel. In addition, embodiments of the method may include additional steps and/or omit steps that are performed and shown. The scope of this disclosure is not limited to these embodiments. The term “comprise” and its variations as used herein means “comprise, but not limited to.” The term “based on” means “based at least in part.” The term “one embodiment” means “at least one embodiment.” The term “another embodiment” means “at least one other embodiment.” The term “several embodiments” means “at least several embodiments.” Relevant definitions of other terms are given below. It should be noted that the concepts such as “first” and “second” as used in this disclosure are used to distinguish different devices, modules, or units, and are not used to limit the order or independence of the functions performed by these devices, modules, or units. It should also be noted that the modifiers “one” and “many” as used in this disclosure are illustrative, not restrictive. Those skilled in the art will understand that the modifiers should be understood as “one or more” unless the context explicitly indicates otherwise. In response to energy savings and emission reductions, electric vehicles are being chosen by an increasing number of users. To improve the driving performance of electric vehicles, multi-motor electric vehicles, known for their powerful performance, are gradually gaining public attention. This powerful performance requires good battery charge and discharge capabilities. However, when electric vehicles are in low-temperature environments, especially below -10°C, the activity of the battery's positive and negative electrode materials, as well as the activity of the electrolyte within the battery, decreases due to the low temperature, significantly reducing the battery's charge and discharge performance. To ensure power for electric vehicles in low-temperature environments, the electric ve