CN217824329U - Battery management unit and battery module - Google Patents
Battery management unit and battery module Download PDFInfo
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- CN217824329U CN217824329U CN202221293869.6U CN202221293869U CN217824329U CN 217824329 U CN217824329 U CN 217824329U CN 202221293869 U CN202221293869 U CN 202221293869U CN 217824329 U CN217824329 U CN 217824329U
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The application provides a battery management unit and a battery module. The battery management unit specifically comprises a sampling chip and at least one voltage sampling circuit, wherein each voltage sampling circuit comprises at least one capacitor branch and at least two resistor branches; each resistance branch is connected in series between the voltage sampling end of the battery management unit and the voltage sampling pin of the sampling chip; one end of each capacitor branch is connected with the connection point of any two adjacent resistor branches, and the other end of each capacitor branch is grounded. Because the electric capacity branch road just links to each other with the voltage sampling pin of sampling chip behind a resistance branch road, and this resistance branch road can restrict transient current, and transient current becomes very little after flowing through this resistance branch road promptly, so can not cause the damage to the sampling chip, therefore the battery management unit that this application provided can avoid transient current to cause the damage to BMU.
Description
Technical Field
The utility model relates to a battery technology field especially relates to a battery management unit and battery module.
Background
In a battery pack, a BMU (battery management unit) directly samples voltage information and temperature information of each battery and controls passive equalization of battery cells, so the BMU is a very important controller in an energy storage system.
Because the BMU is directly connected with the battery, a hot plug process between the BMU and the battery exists in the assembling process, and transient current may be generated and flow through the BMU in the hot plug process, so that the BMU may be damaged; in addition, transient disturbances generated during operation may also cause transient currents to flow through the BMU, thereby causing damage to the BMU.
Therefore, how to avoid the damage of the BMU caused by the transient current is a technical problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a battery management unit and battery module to avoid transient current to cause the damage to the BMU.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
one aspect of the present application provides a battery management unit, including: sampling chip and at least one voltage sampling circuit, the voltage sampling circuit includes: at least one capacitive branch and at least two resistive branches; wherein:
each resistance branch is connected in series between the voltage sampling end of the battery management unit and the voltage sampling pin of the sampling chip;
one end of each capacitor branch is connected with the connection point of any two adjacent resistor branches, and the other end of each capacitor branch is grounded.
Optionally, the method further includes: at least one temperature sampling circuit; the input end of each temperature sampling circuit is respectively used as each temperature sampling end of the battery management unit, and the output end of each temperature sampling circuit is respectively connected with each temperature sampling pin of the sampling chip in a one-to-one correspondence manner.
Optionally, the method further includes: a first stage overvoltage protection circuit; wherein:
the input end of the first-stage overvoltage protection circuit is connected with the voltage sampling end with the highest potential in the battery management unit, and the output end of the first-stage overvoltage protection circuit is grounded.
Optionally, if the number of batteries included in the battery module in which the battery management unit is located is greater than 1, the battery management unit further includes: a second stage overvoltage protection circuit; wherein:
and each input end of the second-stage overvoltage protection circuit is respectively connected with each voltage sampling end and/or each temperature sampling end in the battery management unit in a one-to-one correspondence mode, and the output end of the second-stage overvoltage protection circuit is grounded.
Optionally, the second stage overvoltage protection circuit includes: at least two overvoltage protection modules; wherein:
the input end of the overvoltage protection module is used as the input end of the second-stage overvoltage protection circuit, and the output end of the overvoltage protection module is connected with the output end of the second-stage overvoltage protection circuit.
Optionally, when the input terminal of the second-stage overvoltage protection circuit is connected to the voltage sampling terminal in the battery management unit and the batteries in the battery module are connected in series, in each of the overvoltage protection modules connected to the voltage sampling terminal in the battery management unit:
the overvoltage protection modules are connected in series, and the current flow directions of the formed series branches are uniform;
and the output end of the series branch is connected with the output end of the second-stage overvoltage protection circuit.
Optionally, the method further includes: at least one third stage overvoltage protection circuit; wherein:
the input end of the third-stage overvoltage protection circuit is connected with a corresponding voltage sampling pin of the sampling chip, and the output end of the third-stage overvoltage protection circuit is grounded.
Optionally, the method further includes: a transient interference suppression circuit; wherein:
the transient interference suppression circuit is arranged in: and voltage sampling ends of the battery management unit and voltage sampling pins of the sampling chip.
Another aspect of the present application provides a battery module, including: at least one battery, and a battery management unit as described in any one of the previous aspects of the present application; wherein:
each voltage sampling end of the battery management unit is respectively connected with the anode of each battery;
and each temperature sampling end of the battery management unit is respectively aligned with each battery.
According to the above technical solution, the utility model provides a battery management unit, it specifically includes sampling chip and at least one voltage sampling circuit, and each voltage sampling circuit includes at least one electric capacity branch road and at least two resistance branch roads; each resistance branch is connected in series between the voltage sampling end of the battery management unit and the voltage sampling pin of the sampling chip; one end of each capacitor branch is connected with the connection point of any two adjacent resistor branches, and the other end of each capacitor branch is grounded. Because the electric capacity branch road just links to each other with the voltage sampling pin of sampling chip behind a resistance branch road, and this resistance branch road can restrict transient current, and transient current becomes very little after flowing through this resistance branch road promptly, so can not cause the damage to the sampling chip, therefore the battery management unit that this application provided can avoid transient current to cause the damage to BMU.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1-10 are schematic structural diagrams of ten implementations of a battery management unit provided in an embodiment of the present application;
fig. 11 is a schematic structural diagram of a battery module according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In this application, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
In order to avoid damage to the BMU caused by the transient current, an embodiment of the present application provides a battery management unit, whose specific structure is shown in fig. 1 (only two voltage sampling circuits 30, two battery equalization circuits 40, and two temperature sampling circuits 50 are shown in fig. 1 as an example), including: the system comprises a power supply circuit 10, a sampling chip 20, at least one voltage sampling circuit 30, at least one battery equalization circuit 40 and at least one temperature sampling circuit 50; the specific connection relationship among the devices is as follows:
the input end of the power supply circuit 10 is used as the power supply end of the battery management unit, and the output end of the power supply circuit 10 is connected with the power supply end of the sampling chip 20; the power supply circuit 10 is the same as the prior art in which power is taken, and is not described herein again.
The input end of each voltage sampling circuit 30 is used as each voltage sampling end of the battery management unit, the positive electrode potential of each battery in the battery module where the battery management unit is located is sampled, and the output end of each voltage sampling circuit 30 is connected with each voltage sampling pin of the sampling chip 20 in a one-to-one correspondence manner.
The input end of each battery equalization circuit 40 is connected with the input end of the corresponding voltage sampling circuit 30, and the control end of each battery equalization circuit 40 is connected with the output pins of the sampling chip 20 in a one-to-one correspondence manner.
The input end of each temperature sampling circuit 50 is respectively used as each temperature sampling end of the battery management unit, and the output end of each temperature sampling circuit 50 is respectively connected with each temperature sampling pin of the sampling chip 20 in a one-to-one correspondence manner.
It should be noted that the power supply circuit 10, each battery equalization circuit 40, and each temperature sampling circuit 50 in the battery management unit provided in this embodiment all adopt topology structures in the prior art, and these topology structures are already mature technologies, and therefore are not described in detail here.
Preferably, the sampling chip 20 is an AFE (Analog Front End) chip; in practical applications, including but not limited to, this, it is not limited specifically here, and it is within the scope of this application as the case may be.
In addition, in the present embodiment, as shown in fig. 1 (only one capacitor branch 31 and two resistor branches 32 are shown in fig. 1 as an example), each voltage sampling circuit 30 includes: at least one capacitive branch 31 and at least two resistive branches 32; the number of the capacitor branches 31 and the number of the resistor branches are specifically limited, and may be determined according to specific situations, and are within the protection scope of the present application.
The specific connection relationship is as follows:
each resistance branch 32 is connected in series between a corresponding voltage sampling terminal of the battery management unit and a corresponding voltage sampling pin of the sampling chip 20; one end of each capacitor branch 31 is connected to a connection point of any two adjacent resistor branches 32, and the other end of each capacitor branch 31 is grounded.
The capacitor branch 31 includes at least one capacitor C, and when the number of the capacitors C is equal to 1, the connection is as shown in fig. 1; when the number of the capacitors C is more than 1, the capacitors C are connected in series and/or in parallel; it is not specifically limited herein, and may be within the scope of the present application depending on the specific circumstances.
The resistance branch 32 comprises at least one resistor R, and when the number of the resistors R is equal to 1, the connection is as shown in fig. 1; when the number of the resistors R is more than 1, the resistors R are connected in series and/or in parallel; the present invention is not limited to the above embodiments, and the embodiments are within the scope of the present invention.
Because the capacitor branch 31 is connected with the voltage sampling pin of the sampling chip 20 through the resistor branch 32, and the resistor branch 32 can limit the transient current, that is, the transient current becomes very small after flowing through the resistor branch 32, so that the sampling chip 20 is not damaged, and therefore the battery management unit provided by the application can avoid the damage of the transient current to the BMU.
Optionally, referring to fig. 10 (which is only shown on the basis of fig. 2), a first electrostatic protection circuit 60 is further disposed between each voltage sampling terminal of the battery management unit and each voltage sampling pin of the sampling chip 20, between the power supply terminal of the battery management unit and the input terminal of the power supply circuit 10, and between each temperature sampling terminal of the battery management unit and each temperature sampling pin of the sampling chip 20; a second electrostatic protection circuit 70 is also provided in the communication circuit between the sampling chip 20 and the host controller.
It should be noted that the first esd protection circuit 60 and the second esd protection circuit 70 are the same as those in the prior art, and are not described herein again.
During the production and manufacturing process of the battery management unit, the transient voltage generated by static electricity can damage the battery management unit due to the electrostatic discharge of the port; in addition, during the normal operation of the battery management unit, transient interference may exist, and thus the generated transient voltage may also damage the battery management unit; therefore, how to avoid the damage of the transient voltage to the battery management unit is also an urgent technical problem to be solved.
In order to avoid the damage of the transient voltage to the battery management unit, another embodiment of the present application provides another implementation of the battery management unit, and the specific structure of the implementation can be referred to fig. 2 (fig. 2 is shown only on the basis of fig. 1), and on the basis of the above implementation, the implementation further includes: a first stage overvoltage protection circuit 100; the specific connection relationship with other devices is as follows:
the input end of the first-stage overvoltage protection circuit 100 is connected with the voltage sampling end with the highest potential in the battery management unit, and the output end of the first-stage overvoltage protection circuit 100 is grounded.
It should be noted that the first stage overvoltage protection circuit 100 is the same as the overvoltage protection structure in the prior art, for example, a TVS (Transient voltage suppression) diode is adopted, and a detailed description thereof is omitted here; the specific working principle is as follows:
when the potential of the voltage sampling end with the highest potential in the battery management unit is less than or equal to the set threshold of the first-stage overvoltage protection circuit 100, the first-stage overvoltage protection circuit 100 does not act; when the potential of the voltage sampling end with the highest potential in the battery management unit is greater than the set threshold of the first-stage overvoltage protection circuit 100, the first-stage overvoltage protection circuit 100 releases the voltage sampling end, so that the transient voltage can be inhibited, and the battery management unit can be prevented from being damaged by the transient voltage.
The set threshold of the first stage overvoltage protection circuit 100 is set according to actual conditions.
In this embodiment, by adding the first-stage overvoltage protection circuit 100, the damage to the battery management unit due to the transient voltage in the total voltage of the battery module where the battery management unit is located can be avoided.
In order to avoid the damage of the transient voltage to the battery management unit, another embodiment of the present application further provides another implementation of the battery management unit, and the specific structure of the implementation can refer to fig. 3 (fig. 3 shows that the input ends of the second-stage overvoltage protection circuit 200 are respectively connected to the voltage sampling ends in the battery management unit in a one-to-one correspondence manner only on the basis of fig. 1) or fig. 4 (fig. 4 shows that the input ends of the second-stage overvoltage protection circuit 200 are respectively connected to the voltage sampling ends in the battery management unit in a one-to-one correspondence manner only on the basis of fig. 2), which is suitable for the case that the number of batteries included in the battery module in which the battery management unit is located is greater than 1; on the basis of the above embodiment, this embodiment further includes: a second level of overvoltage protection circuit 200; the specific connection relationship is as follows:
each input end of the second-stage overvoltage protection circuit 200 is connected with each voltage sampling end and/or each temperature sampling end in the battery management unit in a one-to-one correspondence mode, and the output end of the second-stage overvoltage protection circuit 200 is grounded.
It should be noted that, in practical applications, it is determined whether the input terminal of the second stage overvoltage protection circuit 200 is connected to only the voltage sampling terminal of the battery management unit, or connected to only the temperature sampling terminal of the battery management unit, or connected to both the voltage sampling terminal of the battery management unit and the temperature sampling terminal of the battery management unit according to practical situations.
When the potential of a sampling end in the battery management unit is greater than the corresponding set threshold value in the second-stage overvoltage protection circuit 200, the second-stage overvoltage protection circuit 200 discharges the sampling end; when the potential of the sampling terminal in the battery management unit is less than or equal to the corresponding set threshold in the second-stage overvoltage protection circuit 200, the second-stage overvoltage protection circuit 200 does not discharge the sampling terminal.
The corresponding set threshold values correspond to the sampling ends of the battery management units one by one, and the sampling ends of different battery management units have different set threshold values; these setting thresholds are set according to actual conditions.
In this embodiment, the second-stage overvoltage protection circuit 200 is added to prevent the battery management unit from being damaged by transient voltage in the voltages of the batteries in the battery module where the battery management unit is located.
Another embodiment of the present application provides an implementation of the second stage overvoltage protection circuit 200, which is adapted to: the input end of the second overvoltage protection circuit 200 is connected to the voltage sampling end of the battery management unit, the input end of the second overvoltage protection circuit 200 is connected to the temperature sampling end of the battery management unit, or the input end of the second overvoltage protection circuit 200 is connected to both the voltage sampling end and the temperature sampling end of the battery management unit.
The specific structure of this embodiment can be seen in fig. 5 (fig. 5 is shown by taking as an example that the input terminal of the second stage overvoltage protection circuit 200 is connected to both the voltage sampling terminal and the temperature sampling terminal of the battery management unit), which specifically includes: at least two overvoltage protection modules 210, in practical applications, the specific number of the overvoltage protection modules 210 may be determined according to specific situations, and is not specifically limited herein and falls within the protection scope of the present application.
It should be noted that the overvoltage protection module 210 is the same as the overvoltage protection structure in the prior art, such as a TVS (Transient voltage suppression) diode, and a detailed description thereof is omitted here.
The connection relationship between each overvoltage protection module 210 and other devices is as follows:
the input end of each overvoltage protection module 210 is used as the input end of the second stage overvoltage protection circuit 200, and the output end of each overvoltage protection module 210 is connected with the output end of the second stage overvoltage protection circuit 200, i.e. all grounded.
The present embodiment also provides another embodiment of the second stage overvoltage protection circuit 200, which is adapted to: the input end of the second-stage overvoltage protection circuit 200 is connected with the voltage sampling end of the battery management unit and the batteries in the battery module are connected in series, and the input end of the second-stage overvoltage protection circuit 200 is connected with the voltage sampling end of the battery management unit and the temperature sampling end of the battery management unit and the batteries in the battery module are connected in series.
The specific structure of this embodiment can be seen in fig. 6 (fig. 6 is only shown on the basis of fig. 4) or fig. 7 (fig. 7 is only shown on the basis of fig. 4), which specifically includes: at least two overvoltage protection modules 210, in practical applications, the specific number of the overvoltage protection modules 210 may be determined according to specific situations, and is not specifically limited herein, and all of them are within the protection scope of the present application.
It should be noted that the overvoltage protection module 210 is the same as the overvoltage protection structure in the prior art, such as a TVS (Transient voltage suppression) diode, and a detailed description thereof is omitted here.
The connection relationship between each overvoltage protection module 210 and other devices is as follows:
as shown in fig. 6 or fig. 7, in each overvoltage protection module 210 connected to the voltage sampling terminal in the battery management unit: the input end of each overvoltage protection module 210 is used as the input end of the second-stage overvoltage protection circuit 200, the overvoltage protection modules 210 are connected in series, and the current flow directions of the formed series branches are uniform; the output terminal of the series branch is connected to the output terminal of the second stage overvoltage protection circuit 200, i.e., grounded.
As shown in fig. 7, in the remaining overvoltage protection modules 210, an input terminal of each overvoltage protection module 210 is used as an input terminal of the second stage overvoltage protection circuit 200, and an output terminal of each overvoltage protection module 210 is connected to an output terminal of the second stage overvoltage protection circuit 200, that is, is all grounded.
The above embodiments are only three specific embodiments of the second-stage overvoltage protection circuit 200, and in practical applications, including but not limited thereto, and are not limited thereto specifically, and all embodiments are within the protection scope of the present application.
In order to avoid the damage to the battery management unit caused by the transient voltage, another embodiment of the present application also provides another implementation of the battery management unit, the specific structure of which can be seen in fig. 8 (fig. 8 is only shown by taking a third stage overvoltage protection circuit 300 as an example on the basis of fig. 4), and on the basis of the above implementation, this implementation further includes: in practical applications, the specific number of the at least one third stage overvoltage protection circuit 300 may be determined according to specific situations, and is not limited herein, and all of them are within the protection scope of the present application.
The connection relationship between each third-stage overvoltage protection circuit 300 and other devices is as follows:
the input terminal of the third stage overvoltage protection circuit 300 is connected to the corresponding voltage sampling pin of the sampling chip 20, and the output terminal of the third stage overvoltage protection circuit 300 is grounded.
The voltage sampling pin of the sampling chip 20 to which the third stage overvoltage protection circuit 300 is disposed is determined by the actual circuit of the sampling chip 20, and is not limited herein.
It should be noted that the third stage of the overvoltage protection circuit 300 has the same structure as the overvoltage protection circuit in the prior art, and a detailed description thereof is omitted here; the specific working principle is as follows:
when the potential of the corresponding voltage sampling pin of the sampling chip 20 is less than or equal to the set threshold of the third stage overvoltage protection circuit 300, the third stage overvoltage protection circuit 300 does not act; when the potential of the corresponding voltage sampling pin of the sampling chip 20 is greater than the set threshold of the third overvoltage protection circuit 300, the third overvoltage protection circuit 300 releases the voltage sampling terminal, so that the transient voltage can be suppressed, and the battery management unit can be prevented from being damaged by the transient voltage.
The set threshold of the third stage overvoltage protection circuit 300 is set according to actual conditions.
During the normal operation of the battery management unit, there may be transient interference, and the transient interference may damage the battery management unit, so how to suppress the transient interference is also an urgent technical problem to be solved.
In order to suppress the transient interference, another embodiment of the present application further provides another implementation of the battery management unit, and the specific structure of the battery management unit can be seen in fig. 9 (fig. 9 is only shown on the basis of fig. 8), and on the basis of the above implementation, this implementation further includes: a glitch suppression circuit 400; the connection relationship between the device and other devices is specifically as follows:
the glitch suppression circuit 400 is configured to: between each voltage sampling terminal of the battery management unit and each voltage sampling pin of the sampling chip 20, and between the power supply terminal of the battery management unit and the input terminal of the power supply circuit 10.
It should be noted that the glitch suppression circuit 400 has the same structure as the overvoltage protection circuit in the prior art, and the structure thereof is not described in detail here, and may be selected according to specific situations, and is not limited here.
In this embodiment, by adding the glitch suppression circuit 400, the glitch can be suppressed and prevented from affecting the normal operation of the sampling chip 20.
Another embodiment of the present application provides a battery module, which has a specific structure as shown in fig. 11, and specifically includes: at least one battery Cell, and, as provided in the above embodiment, a battery management unit 01; the specific number of the battery cells may be determined according to specific situations, and is not specifically limited herein, which is within the scope of the present application.
The specific connection relationship of the battery modules is as follows:
each voltage sampling end of the battery management unit 01 is respectively connected with the anode of each battery Cell; the temperature sampling terminals CT of the battery management unit 01 are aligned with the battery cells, respectively.
In practical applications, the battery module further includes other components, but all the components are the same as those in the prior art, and the detailed description is omitted here, and reference is made to the prior art.
In the above description of the disclosed embodiments, features described in various embodiments in this specification can be substituted for or combined with each other to enable those skilled in the art to make or use the present application. The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Any person skilled in the art can, without departing from the scope of the invention, the technical solution of the present invention can be utilized in many possible variations and modifications, or modified to equivalent embodiments with equivalent variations, using the methods and technical content disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention all still fall within the protection scope of the technical solution of the present invention, where the technical entity does not depart from the content of the technical solution of the present invention.
Claims (10)
1. A battery management unit, comprising: sampling chip and at least one voltage sampling circuit, the voltage sampling circuit includes: at least one capacitive branch and at least two resistive branches; wherein:
each resistance branch is connected in series between the voltage sampling end of the battery management unit and the voltage sampling pin of the sampling chip;
one end of each capacitor branch is connected with the connection point of any two adjacent resistor branches, and the other end of each capacitor branch is grounded.
2. The battery management unit according to claim 1, wherein the capacitor branch comprises at least one capacitor, and when the number of the capacitors is greater than 1, the capacitors are connected in series and/or in parallel;
the resistance branch comprises at least one resistor, and when the number of the resistors is larger than 1, the resistors are connected in series and/or in parallel.
3. The battery management unit of claim 1, further comprising: at least one temperature sampling circuit; the input end of each temperature sampling circuit is respectively used as each temperature sampling end of the battery management unit, and the output end of each temperature sampling circuit is respectively connected with each temperature sampling pin of the sampling chip in a one-to-one correspondence manner.
4. The battery management unit of any of claims 1 to 3, further comprising: a first stage overvoltage protection circuit; wherein:
the input end of the first-stage overvoltage protection circuit is connected with the voltage sampling end with the highest potential in the battery management unit, and the output end of the first-stage overvoltage protection circuit is grounded.
5. The battery management unit according to any one of claims 1 to 3, wherein if the number of batteries included in the battery module in which the battery management unit is located is greater than 1, the battery management unit further comprises: a second level overvoltage protection circuit; wherein:
and each input end of the second-stage overvoltage protection circuit is respectively connected with each voltage sampling end and/or each temperature sampling end in the battery management unit in a one-to-one correspondence manner, and the output end of the second-stage overvoltage protection circuit is grounded.
6. The battery management unit of claim 5, wherein the second stage over-voltage protection circuit comprises: at least two overvoltage protection modules; wherein:
the input end of the overvoltage protection module is used as the input end of the second-stage overvoltage protection circuit, and the output end of the overvoltage protection module is connected with the output end of the second-stage overvoltage protection circuit.
7. The battery management unit of claim 6, wherein when the input of the second stage over-voltage protection circuit is connected to the voltage sampling terminal of the battery management unit and the batteries in the battery module are connected in series, in each over-voltage protection module connected to the voltage sampling terminal of the battery management unit:
the overvoltage protection modules are connected in series, and the current flow directions of the formed series branches are uniform;
and the output end of the series branch is connected with the output end of the second-stage overvoltage protection circuit.
8. The battery management unit according to any one of claims 1 to 3, further comprising: at least one third stage overvoltage protection circuit; wherein:
the input end of the third-stage overvoltage protection circuit is connected with the corresponding voltage sampling pin of the sampling chip, and the output end of the third-stage overvoltage protection circuit is grounded.
9. The battery management unit of any of claims 1 to 3, further comprising: a transient interference suppression circuit; wherein:
the transient interference suppression circuit is arranged in: and each voltage sampling end of the battery management unit is connected with each voltage sampling pin of the sampling chip.
10. A battery module, comprising: at least one battery, and a battery management unit as claimed in any one of claims 1 to 9; wherein:
each voltage sampling end of the battery management unit is respectively connected with the anode of each battery;
and each temperature sampling end of the battery management unit is respectively aligned with each battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221293869.6U CN217824329U (en) | 2022-05-27 | 2022-05-27 | Battery management unit and battery module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221293869.6U CN217824329U (en) | 2022-05-27 | 2022-05-27 | Battery management unit and battery module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217824329U true CN217824329U (en) | 2022-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221293869.6U Active CN217824329U (en) | 2022-05-27 | 2022-05-27 | Battery management unit and battery module |
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| CN (1) | CN217824329U (en) |
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- 2022-05-27 CN CN202221293869.6U patent/CN217824329U/en active Active
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