CN215751956U - Power battery and electric automobile - Google Patents
Power battery and electric automobile Download PDFInfo
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- CN215751956U CN215751956U CN202120686345.2U CN202120686345U CN215751956U CN 215751956 U CN215751956 U CN 215751956U CN 202120686345 U CN202120686345 U CN 202120686345U CN 215751956 U CN215751956 U CN 215751956U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The utility model discloses a power battery and an electric automobile. The power battery comprises a pre-charging resistor and a pre-charging switch which are connected in series to form a pre-charging circuit, one end of the pre-charging circuit is connected with the driving plug-in positive pole, and the other end of the pre-charging circuit is connected with the first battery module and the second switch; one end of the first switch is connected with the first battery module, and the other end of the first switch is connected with the second battery module; one end of the second switch is connected with the main positive switch and the pre-charging circuit, and the other end of the second switch is connected with the second battery module; one end of the third switch is connected with the first battery module, and the other end of the third switch is connected with the main negative switch; one end of the main positive switch is connected with the driving insertion positive electrode, and the other end of the main positive switch is connected with the first battery module and the second switch; one end of the main negative switch is connected with the third switch and the second battery module, and the other end of the main negative switch is connected with the driving plug-in cathode and the quick-charging plug-in cathode; one end of the quick charge switch is connected with the positive pole of the quick charge plug-in connection, and the other end of the quick charge switch is connected with the first battery module. The power battery can realize high-power quick charging only in the quick charging process, and the charging efficiency is improved.
Description
Technical Field
The utility model relates to the technical field of power batteries, in particular to a power battery and an electric automobile.
Background
The voltage platform of the existing power battery is generally about 400V, the maximum charging current of the charging pile is limited not to exceed 250A, and the maximum charging power of the power battery is limited below 100 kW. If the maximum charging power of the power battery needs to be increased, the voltage of the voltage platform needs to be increased, but the increase of the voltage platform can cause the problems that the vehicle-mounted electric equipment needs to be matched again and the development cost of the whole vehicle needs to be increased.
SUMMERY OF THE UTILITY MODEL
The utility model provides a power battery and an electric automobile, and aims to solve the problems that a platform is difficult to modify and the cost is high in the process of improving the maximum charging power of the power battery.
The utility model provides a power battery, which is provided with a driving plug-in positive pole, a driving plug-in negative pole, a quick-charging plug-in positive pole and a quick-charging plug-in negative pole, and also comprises a first battery module, a second battery module, a pre-charging resistor, a first switch, a second switch, a third switch, a main positive switch, a main negative switch, a quick-charging switch and a pre-charging switch;
the pre-charging resistor and the pre-charging switch are connected in series to form a pre-charging circuit, the pre-charging resistor is connected with the driving plug-in positive electrode, and the pre-charging switch is connected with the positive electrode of the first battery module and the second switch; or the pre-charging switch is connected with the driving plug-in positive electrode, and the pre-charging resistor is connected with the positive electrode of the first battery module and the second switch;
one end of the first switch is connected with the negative electrode of the first battery module, and the other end of the first switch is connected with the positive electrode of the second battery module;
one end of the second switch is connected with the main positive switch and the pre-charging circuit, and the other end of the second switch is connected with the positive electrode of the second battery module;
one end of the third switch is connected with the negative electrode of the first battery module, and the other end of the third switch is connected with the main negative switch;
one end of the main positive switch is connected with the driving plug-in positive electrode, and the other end of the main positive switch is connected with the first battery module and the second switch;
one end of the main negative switch is connected with the third switch and the negative electrode of the second battery module, and the other end of the main negative switch is connected with the driving plug-in negative electrode and the quick-charging plug-in negative electrode;
one end of the quick charge switch is connected with the quick charge insertion anode, and the other end of the quick charge switch is connected with the first battery module.
Preferably, the first battery module and the second battery module each include at least one battery module.
Preferably, the battery module comprises at least two single square-shell batteries.
Preferably, the battery module comprises at least two single soft package batteries.
Preferably, the battery module includes at least two single cylindrical batteries.
Preferably, the rated voltage of the first battery module and the rated voltage of the second battery module are the same.
Preferably, the first switch, the second switch, the third switch, the main positive switch, the main negative switch, the quick charging switch and the pre-charging switch are at least one of an electronic switch, a relay, a contactor and an air switch.
The utility model provides an electric automobile which comprises the power battery.
According to the power battery and the electric automobile, the first battery module and the second battery module are arranged in the power battery, and the first switch, the second switch and the third switch are matched to realize switching of the first battery module and the second battery module into a serial state or a parallel state. In other words, in the discharging process of the power battery, the second switch and the third switch are closed, so that the first battery module and the second battery module enter a parallel connection state, and the vehicle-mounted electric equipment is discharged under the condition that the voltage platforms of other vehicle-mounted electric equipment of the whole vehicle are not changed. In the charging process of the power battery, the first switch is closed, so that the first battery module and the second battery module enter a series connection state, the total voltage of the power battery is the sum of the voltage of the first battery module and the voltage of the second battery module, the voltage is increased in the quick charging process, and the charging rate and the charging efficiency are improved. Understandably, the high-power quick charging can be realized by only adding the switch circuit in the power battery without changing the layout of the electric core in the power battery and influencing the energy density of the power battery and only switching the power battery into a series connection state in the charging process. Moreover, the series circuit is only used in the charging process, so that the use of other vehicle-mounted electric equipment on the whole vehicle is not influenced, the voltage platform of other vehicle-mounted electric equipment is not required to be changed, and the problem of high transformation cost caused by the fact that the voltage platform is promoted is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic circuit diagram of a power battery according to an embodiment of the utility model.
In the figure: 11. a first battery module; 12. a second battery module; r1, a pre-charging resistor; k1, a first switch; k2, a second switch; k3, a third switch; k4, main positive switch; k5, main negative switch; k6, quick opening; k7, pre-charge switch; 21. a drive connector; 22. and a quick-charging connector.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is to be understood that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity to indicate like elements throughout.
It will be understood that when an element or layer is referred to as being "on" …, "adjacent to …," "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to the other elements or layers or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on …," "directly adjacent to …," "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.
Spatial relationship terms such as "under …", "under …", "below", "under …", "above …", "above", and the like, may be used herein for ease of description to describe the relationship of one element or feature to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, then elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "below …" and "below …" can encompass both an orientation of up and down. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatial descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
In the following description, for purposes of explanation, specific details are set forth in order to provide a thorough understanding of the present invention. The following detailed description of the preferred embodiments of the utility model, however, the utility model is capable of other embodiments in addition to those detailed.
The utility model provides a power battery, as shown in fig. 1, the power battery is provided with a driving plug-in positive electrode HV +, a driving plug-in negative electrode HV-, a fast-charging plug-in positive electrode DC + and a fast-charging plug-in negative electrode DC-, and further comprises a first battery module 11, a second battery module 12, a pre-charging resistor R1, a first switch K1, a second switch K2, a third switch K3, a main positive switch K4, a main negative switch K5, a fast-charging switch K6 and a pre-charging switch K7; the pre-charging resistor R1 and the pre-charging switch K7 are connected in series to form a pre-charging circuit, the pre-charging resistor R1 is connected with the driving plug-in positive electrode HV +, and the pre-charging switch K7 is connected with the positive electrode of the first battery module 11 and the second switch K2; or the pre-charging switch K7 is connected with the driving plug-in positive electrode HV +, and the pre-charging resistor R1 is connected with the positive electrode of the first battery module 11 and the second switch K2; one end of the first switch K1 is connected to the negative electrode of the first battery module 11, and the other end is connected to the positive electrode of the second battery module 12; one end of the second switch K2 is connected with the main positive switch K4 and the pre-charging circuit, and the other end is connected with the positive pole of the second battery module 12; one end of the third switch K3 is connected with the negative electrode of the first battery module 11, and the other end is connected with the main negative switch K5; one end of the main positive switch K4 is connected with the driving plug positive electrode HV +, and the other end is connected with the first battery module 11 and the second switch K2; one end of the main negative switch K5 is connected with the third switch K3 and the negative electrode of the second battery module 12, and the other end is connected with the driving plug-in negative electrode HV-and the quick-charging plug-in negative electrode DC-; one end of the fast charging switch K6 is connected with the fast charging plug positive electrode DC +, and the other end is connected with the first battery module 11.
The driving plug-in positive electrode HV + and the driving plug-in negative electrode HV-are interfaces for connecting with the driving plug-in unit 21. The drive plug 21 is a discharge interface for discharging an electric drive system. The fast charge plug positive DC + and the fast charge plug negative DC-are interfaces for achieving connection with the fast charge plug 22. The quick charging connector 22 is a charging interface of a charging gun.
The pre-charging resistor R1 and the pre-charging switch K7 are connected in series to form a pre-charging circuit, the pre-charging circuit is used for achieving a pre-charging effect, and is mainly used for protecting the main positive switch K4 and avoiding contact ablation of the main positive switch K4. The pre-charging resistor R1 and the pre-charging switch K7 are connected in series to form a pre-charging circuit, one end of the pre-charging circuit is connected with the driving plug-in positive electrode HV +, and the other end of the pre-charging circuit is connected with the positive electrode of the first battery module 11 and the second switch K2. As an example, the pre-charge resistor R1 is connected to the driving plug positive electrode HV +, and the pre-charge switch K7 is connected to the positive electrode of the first battery module 11 and the second switch K2; alternatively, the pre-charge switch K7 is connected to the driving plug positive electrode HV +, and the pre-charge resistor R1 is connected to the positive electrode of the first battery module 11 and the second switch K2.
One end of the first switch K1 is connected to the negative electrode of the first battery module 11, and the other end is connected to the positive electrode of the second battery module 12, and the first switch K1 is a switch for connecting the first battery module 11 and the second battery module 12 in series.
One end of the second switch K2 is connected to the main positive switch K4 and the pre-charge circuit, and the other end is connected to the positive electrode of the second battery module 12. One end of the third switch K3 is connected to the negative electrode of the first battery module 11, and the other end is connected to the main negative switch K5. In this example, the second switch K2 and the third switch K3 are switches for realizing the parallel arrangement of the first battery module 11 and the second battery module 12.
One end of the main positive switch K4 is connected to the driving insertion positive electrode HV +, and the other end is connected to the first battery module 11 and the second switch K2, so that when the first battery module 11 and the second battery module 12 are connected in parallel and the main positive switch K4 is closed, current can flow through the first battery module 11 and through the second battery module 12 via the second switch K2.
One end of the main negative switch K5 is connected with the third switch K3 and the negative electrode of the second battery module 12, and the other end is connected with the driving plug-in negative electrode HV-and the fast-charging plug-in negative electrode DC-, and the main negative switch K5 is a switch for realizing the current flowing into the driving plug-in negative electrode HV-and the fast-charging plug-in negative electrode DC-.
One end of the quick charge switch K6 is connected with the quick charge insertion positive pole DC +, the other end is connected with the first battery module 11, and the quick charge function can be realized by controlling the closing of the quick charge switch K6 when the first battery module 11 and the second battery module 12 are connected in series.
As an example, when the power battery is in a default state, the first switch K1, the second switch K2, the third switch K3, the main positive switch K4, the pre-charge switch K7, the fast charge switch K6, and the main negative switch K5 are all in an open state, and when the power battery discharges the electric drive system, the process is as follows:
a1: when the power battery is connected into the driving loop, namely the driving plug-in positive electrode HV + and the driving plug-in negative electrode HV-on the power battery are connected into the driving plug-in unit 21 of the driving loop, the second switch K2 and the third switch K3 are controlled to be closed, so that the first battery module 11 and the second battery module 12 are in a parallel connection state, and at the moment, the voltage at the two ends of the driving plug-in unit 21 is the same as the voltage at the two ends of the two battery modules.
A2: when the first battery module 11 and the second battery module 12 are in a parallel state, the pre-charging switch K7 and the main negative switch K5 are controlled to be closed, so that a pre-charging circuit formed by serially connecting the pre-charging resistor R1 and the pre-charging switch K7 forms two closed loops with the first battery module 11 and the second battery module 12, namely, a closed loop is formed between the driving plug-in positive electrode HV +, the pre-charging circuit, the first battery module 11, the third switch K3, the main negative switch K5 and the driving plug-in negative electrode HV-, and another closed loop is formed between the driving plug-in positive electrode HV +, the pre-charging circuit, the second switch K2, the second battery module 12, the main negative switch K5 and the driving plug-in negative electrode HV-. In this example, the pre-charge circuit formed by the pre-charge resistor R1 and the pre-charge switch K7 connected in series is pre-charged by the pre-charge circuit, so as to avoid the problem that the main positive switch K4 contacts are ablated due to a large current when the main positive switch K4 is directly grounded, and therefore, the line current needs to be reduced through the pre-charge circuit first.
A3: and detecting the current state corresponding to the power battery in real time, and when the current state meets a preset condition, firstly controlling the main positive switch K4 to be closed, and then controlling the pre-charging switch K7 to be opened so as to enable the power battery to enter a driving working state. The preset condition here may be set such that the voltage difference between the voltage across the driving plug 21 and the voltages across the two battery modules is within a preset range.
As an example, when the power battery is in a default state, the first switch K1, the second switch K2, the third switch K3, the main positive switch K4, the pre-charging switch K7, the quick-charging switch K6, and the main negative switch K5 are all in an off state, and when the power battery is connected to the charging pile for quick charging, the processing procedure is as follows:
b1: the power battery is connected into the quick charging loop, namely the quick charging plug-in positive pole DC + and the quick charging plug-in negative pole DC-of the power battery, and the quick charging plug-in unit 22 of the quick charging loop is connected, namely the quick charging plug-in unit 22 is a charging interface of a charging gun, the first switch K1 is firstly controlled to be closed, so that the first battery module 11 and the second battery module 12 are in a serial connection state.
B2: when the first battery module 11 and the second battery module 12 are in a series state, the total voltage of the power battery is equal to the sum of the voltage of the first battery module 11 and the voltage of the second battery module 12, and then the quick-charging switch K6 and the main negative switch K5 are controlled to be closed, so that a closed loop is formed among the quick-charging plug connector 22, the quick-charging switch K6, the first battery module 11, the first switch K1, the second battery module 12 and the main negative switch K5, and the power battery enters a quick-charging state.
In the power battery provided by the embodiment, the first battery module 11 and the second battery module 12 are arranged inside the power battery, and the first switch K1, the second switch K2 and the third switch K3 are matched to realize switching of the first battery module 11 and the second battery module 12 into a series connection state or a parallel connection state. In other words, in the discharging process of the power battery, the second switch K2 and the third switch K3 are closed, so that the first battery module 11 and the second battery module 12 enter a parallel connection state, and the vehicle-mounted electric equipment is discharged under the condition that the voltage platforms of other vehicle-mounted electric equipment of the whole vehicle are not changed. In the charging process of the power battery, the first switch K1 is closed, so that the first battery module 11 and the second battery module 12 enter a series connection state, and the total voltage of the power battery is the sum of the voltage of the first battery module 11 and the voltage of the second battery module 12, so that the voltage is increased in the quick charging process, and the charging rate and the charging efficiency are improved. Understandably, the high-power quick charging can be realized by only adding the switch circuit in the power battery without changing the layout of the electric core in the power battery and influencing the energy density of the power battery and only switching the power battery into a series connection state in the charging process. Moreover, the series circuit is only used in the charging process, so that the use of other vehicle-mounted electric equipment on the whole vehicle is not influenced, the voltage platform of other vehicle-mounted electric equipment is not required to be changed, and the problem of high transformation cost caused by the fact that the voltage platform is promoted is solved.
In one embodiment, each of the first and second battery modules 11 and 12 includes at least one battery module.
The battery module refers to a battery pack formed of a plurality of unit batteries. Understandably, the first battery module 11 and the second battery module 12 may each be a module in which at least one battery module is formed in series and/or parallel.
In one embodiment, the battery module comprises at least two single square-shell batteries. Understandably, the battery module can be formed by combining at least two single square-shell batteries according to actual development requirements so as to meet the requirements of users.
In one embodiment, the battery module comprises at least two single soft package batteries. Understandably, the battery module can be formed by combining at least two single soft package batteries according to actual development requirements so as to meet the requirements of users.
In one embodiment, the battery module comprises at least two single cylindrical batteries. Understandably, at least two single cylindrical batteries can be combined to form a battery module according to actual development requirements so as to meet the requirements of users.
In one embodiment, the voltage rating of the first battery module 11 and the voltage rating of the second battery module 12 are the same.
In this example, the rated voltage of the first battery module 11 and the rated voltage of the second battery module 12 are configured to be the same, so as to avoid the problem of voltage drop and current change caused by different rated voltages of the two battery modules in the switching process of the series connection mode or the parallel connection mode of the first battery module 11 and the second battery module 12, and thus, the power utilization safety of the vehicle-mounted electric equipment on the automobile can be effectively guaranteed.
In one embodiment, the first switch K1, the second switch K2, the third switch K3, the main positive switch K4, the main negative switch K5, the fast charging switch K6 and the pre-charging switch K7 are at least one of an electronic switch, a relay, a contactor and an air switch.
In this example, the first switch K1, the second switch K2, the third switch K3, the main positive switch K4, the main negative switch K5, the quick charge switch K6, and the pre-charge switch K7 may be any one of an electronic switch, a relay, a contactor, and an air switch. For example, the first switch K1, the second switch K2, the third switch K3, the main positive switch K4, the main negative switch K5, the fast charge switch K6, and the precharge switch K7 may be relays at the same time.
In this example, the first switch K1, the second switch K2, the third switch K3, the main positive switch K4, the main negative switch K5, the fast charging switch K6, and the pre-charging switch K7 may be any combination of at least two of an electronic switch, a relay, a contactor, and an air switch. For example, the first switch K1, the second switch K2, and the third switch K3 are electronic switches, and the main positive switch K4, the main negative switch K5, the quick charge switch K6, and the precharge switch K7 are relays.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (8)
1. A power battery is characterized in that a driving plug-in positive pole, a driving plug-in negative pole, a quick-charging plug-in positive pole and a quick-charging plug-in negative pole are arranged on the power battery, and the power battery further comprises a first battery module, a second battery module, a pre-charging resistor, a first switch, a second switch, a third switch, a main positive switch, a main negative switch, a quick-charging switch and a pre-charging switch;
the pre-charging resistor and the pre-charging switch are connected in series to form a pre-charging circuit, the pre-charging resistor is connected with the driving plug-in positive electrode, and the pre-charging switch is connected with the positive electrode of the first battery module and the second switch; or the pre-charging switch is connected with the driving plug-in positive electrode, and the pre-charging resistor is connected with the positive electrode of the first battery module and the second switch;
one end of the first switch is connected with the negative electrode of the first battery module, and the other end of the first switch is connected with the positive electrode of the second battery module;
one end of the second switch is connected with the main positive switch and the pre-charging circuit, and the other end of the second switch is connected with the positive electrode of the second battery module;
one end of the third switch is connected with the negative electrode of the first battery module, and the other end of the third switch is connected with the main negative switch;
one end of the main positive switch is connected with the driving plug-in positive electrode, and the other end of the main positive switch is connected with the first battery module and the second switch;
one end of the main negative switch is connected with the third switch and the negative electrode of the second battery module, and the other end of the main negative switch is connected with the driving plug-in negative electrode and the quick-charging plug-in negative electrode;
one end of the quick charge switch is connected with the quick charge insertion anode, and the other end of the quick charge switch is connected with the first battery module.
2. The power cell of claim 1, wherein the first battery module and the second battery module each comprise at least one battery module.
3. The power battery of claim 2, wherein the battery module comprises at least two single square-shell batteries.
4. The power battery of claim 2, wherein the battery module comprises at least two single pouch batteries.
5. The power battery of claim 2, wherein the battery module comprises at least two single cylindrical batteries.
6. The power cell of claim 1, wherein a voltage rating of a first battery module is the same as a voltage rating of the second battery module.
7. The power cell of claim 1, wherein the first switch, the second switch, the third switch, the main positive switch, the main negative switch, the fast charge switch, and the pre-charge switch are each at least one of an electronic switch, a relay, a contactor, and an air switch.
8. An electric vehicle comprising the power battery according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120686345.2U CN215751956U (en) | 2021-04-02 | 2021-04-02 | Power battery and electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120686345.2U CN215751956U (en) | 2021-04-02 | 2021-04-02 | Power battery and electric automobile |
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| CN215751956U true CN215751956U (en) | 2022-02-08 |
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| CN202120686345.2U Active CN215751956U (en) | 2021-04-02 | 2021-04-02 | Power battery and electric automobile |
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- 2021-04-02 CN CN202120686345.2U patent/CN215751956U/en active Active
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