CN109917297B - Battery detection method, circuit and device - Google Patents
Battery detection method, circuit and device Download PDFInfo
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- CN109917297B CN109917297B CN201910252995.3A CN201910252995A CN109917297B CN 109917297 B CN109917297 B CN 109917297B CN 201910252995 A CN201910252995 A CN 201910252995A CN 109917297 B CN109917297 B CN 109917297B
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Abstract
The invention provides a battery detection method, a circuit and a device, wherein the circuit comprises: a plurality of battery branches connected in parallel with each other; the first end of each battery branch is electrically connected with the first node, the second end of each battery branch is electrically connected with the second node, and each battery branch is provided with a battery to be tested, wherein one battery branch is marked as a reference branch, and the leakage current of the battery to be tested in the reference branch is a known quantity; and the current collector is used for directly or indirectly detecting the current in each battery branch and provides a circuit basis for batch measurement of the batteries to be measured.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a battery detection method, a battery detection circuit and a battery detection device.
Background
In the existing battery leakage detection scheme, battery leakage is usually detected by an internal short circuit identification method based on a symmetrical ring circuit topology structure and a symmetrical ring circuit topology structure, and a certain battery is determined to be an internal short circuit battery by comparing characteristic values of the batteries in the detection process. Here, the battery characteristic value may be a correlation coefficient between an actual current value and a theoretical current value of each battery, or may be a measured current proportional relationship of each battery, or the like.
However, the above battery detection scheme is generally used for detecting batteries individually, and cannot detect batteries in batch.
Disclosure of Invention
In view of this, embodiments of the present invention provide a battery detection method, a battery detection circuit and a battery detection device, so as to provide a scheme capable of detecting a plurality of batteries to be detected.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a battery detection circuit comprising:
a plurality of battery branches connected in parallel with each other;
the first end of each battery branch is electrically connected with the first node, the second end of each battery branch is electrically connected with the second node, and each battery branch is provided with a battery to be tested, wherein one battery branch is marked as a reference branch, and the leakage current of the battery to be tested in the reference branch is a known quantity;
and the current collector is used for directly or indirectly detecting the current in each battery branch.
Optionally, in the battery detection circuit, the number of the current collectors corresponds to the number of the battery branches one to one, and each current collector is disposed in one battery branch.
Optionally, in the battery detection circuit, the first node or the second node is a node on the ring-shaped wire, the number of the current collectors corresponds to the number of the battery branches one to one, the current collectors are connected in series on the ring-shaped wire, and the connection points of the ring-shaped wire and the current collectors of each battery branch are alternately arranged.
Optionally, in the battery detection circuit described above,
each battery branch is distributed along a first direction;
the first end of each battery branch is electrically connected with the first node through a first conducting wire, the first conducting wire is a ring-shaped conducting wire, and the first node is any one connecting point which is electrically connected with the first end of each battery branch on the first conducting wire;
the second end of each battery branch is electrically connected with the second node through a second conducting wire, the second conducting wire is an annular conducting wire, and the second node is any one connecting point which is electrically connected with the second end of each battery branch on the second conducting wire.
A battery detection method, comprising:
the method comprises the steps that the branch current of each battery branch in a battery detection circuit is obtained, the battery detection circuit comprises a plurality of battery branches which are connected in parallel, namely, the first end of each battery branch is electrically connected with a first node, the second end of each battery branch is electrically connected with a second node, a battery to be detected is arranged in each battery branch, one battery branch is marked as a reference branch, and the leakage current of the battery to be detected in the reference branch is a known quantity and is marked as standard leakage current;
calculating the current difference value of the branch current of the reference branch and the branch current of each other battery branch;
and taking the sum of the standard leakage current and each calculated current difference value as the battery leakage current of the battery to be detected in the corresponding battery branch.
Optionally, the battery detection method further includes:
acquiring a voltage difference between the first node and the second node;
and calculating the leakage resistance of each battery to be tested by adopting the voltage difference and the measured battery leakage current based on ohm's law.
Optionally, the battery detection method further includes:
acquiring standard leakage current matched with the battery to be tested in each battery branch;
calculating the ratio of the battery leakage current of the battery to be tested in the same battery branch circuit to the standard leakage current;
and acquiring and outputting prompt information matched with the ratio.
Optionally, in the battery detection method, the obtaining of the branch current of each battery branch in the battery detection circuit specifically includes:
acquiring branch current of each battery branch through a current collector in each battery branch arranged in the battery detection circuit;
or the like, or, alternatively,
and calculating the branch current of each battery branch in the battery detection circuit according to the kirchhoff current law by using the current value acquired by the current collector arranged in the positive loop or the negative loop of the battery detection circuit.
A battery test apparatus, comprising: the battery detection circuit of any of the above, and a processor;
the leakage current of the battery to be tested in the reference branch is marked as standard leakage current;
the processor is configured to:
calculating branch current of each battery branch in the battery detection circuit according to a current value output by a current collector in the battery detection circuit; calculating the current difference value of the branch current of the reference branch and the branch current of each other battery branch; and taking the sum of the standard leakage current and each calculated current difference value as the battery leakage current of the battery to be detected in the corresponding battery branch.
Optionally, in the above battery detection apparatus, the processor is further configured to:
acquiring a voltage difference between the first node and the second node in the battery detection circuit; and calculating the leakage resistance of each battery to be tested by adopting the voltage difference and the measured battery leakage current based on ohm's law.
Optionally, in the above battery detection apparatus, the processor is further configured to:
acquiring standard leakage current matched with the battery to be tested in each battery branch;
calculating the ratio of the battery leakage current of the battery to be tested in the same battery branch circuit to the standard leakage current;
and acquiring and outputting prompt information matched with the ratio.
Optionally, in the above battery detection device, when the processor calculates the branch current of each battery branch in the battery detection circuit according to the current value output by the current collector in the battery detection circuit, the processor is specifically configured to:
acquiring branch current of each battery branch through a current collector in each battery branch arranged in the battery detection circuit;
or the like, or, alternatively,
and calculating the branch current of each battery branch in the battery detection circuit according to the kirchhoff current law by using the current value acquired by the current collector arranged in the positive loop or the negative loop of the battery detection circuit.
Based on the above technical solution, in the above scheme provided in the embodiment of the present invention, a plurality of battery branches connected in parallel are provided in a battery detection circuit, a first end of each battery branch is electrically connected to a first node, a second end of each battery branch is electrically connected to a second node, and a battery to be tested is provided in each battery branch, where one battery branch is marked as a reference branch, and a leakage current of the battery to be tested in the reference branch is a known quantity; the current collector directly or indirectly detects the current in each battery branch, thereby providing a circuit foundation for batch measurement of the batteries to be measured, and further realizing batch measurement of the batteries to be measured on the basis of a circuit-based method and a circuit-based device.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 is a schematic diagram of a topology structure of a battery detection circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a topology of a battery detection circuit according to another embodiment of the disclosure;
FIG. 3 is a schematic diagram of a topology of a battery detection circuit according to another embodiment of the disclosure;
FIG. 4 is a schematic flow chart illustrating a battery detection method according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of a battery detection method according to another embodiment of the present invention.
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
In order to solve the problem that the battery measurement method in the prior art cannot perform batch measurement on batteries, the invention discloses a battery detection circuit, and referring to fig. 1, fig. 1 is a schematic diagram of a topology structure of the battery detection circuit disclosed by the embodiment of the invention, and the battery detection circuit includes: a plurality of battery branches 100 and a current collector 200.
The first end of each battery branch 100 is electrically connected to the first node a, the second end of each battery branch 100 is electrically connected to the second node B, and each battery branch 100 is provided with one battery to be tested, and the leakage current of the battery to be tested in one battery branch 100 is a known quantity, the battery branch 100 is marked as a reference branch, and the current in the reference branch is marked as a standard leakage current. The first node a may refer to any one of the metal conductors and a connection point having an electrical connection relationship with the first end of each battery branch, the second node B may refer to any one of the other metal conductors and a connection point having an electrical connection relationship with the second end of each battery branch, and the arrangement manner of the first node a and the first node B may be selected by a user according to a user requirement, for example, the first node a and the first node B may be arranged in a ring circuit topology manner as shown in fig. 1, and of course, the first end and/or the second end of each battery branch 100 may also be connected to the first node a and the second node B in a star connection manner.
The current collectors 200 are configured to directly or indirectly detect currents in the battery branches 100, where the number and the positions of the current collectors 200 may be set according to user requirements, for example, referring to fig. 1, the number of the current collectors 200 corresponds to the number of the battery branches 100 one by one, and each current collector 200 is respectively disposed in one battery branch 100, of course, the setting manner of the current collector 200 shown in fig. 1 is only an example, and the setting manners of other current collectors 200 that can collect currents in the corresponding battery branches 100 are within the protection scope of the present invention.
The following describes the implementation principle of the battery detection circuit provided by the embodiment corresponding to fig. 1 of the present invention:
in the topology circuit shown in fig. 1, the battery branches where the batteries to be tested are located are connected in parallel through the first node a and the second node B, so that the batteries to be tested in the battery branches have the same status and priority. In the topology circuit shown in fig. 1, if there is a leakage/self-discharge/internal short circuit condition of the battery to be tested, each battery to be tested in the topology circuit will generate a leakage/self-discharge/internal short circuit current of the same magnitude, and the battery to be tested with the leakage/self-discharge/internal short circuit will flow through the first node a and the second node B. In the above circuit structure of the present invention, the number of the battery branches 100 can be set according to the user's requirement, and the circuit can simultaneously include a plurality of batteries to be tested.
For convenience of explaining the principle of the battery detection circuit, in the technical scheme disclosed in fig. 1 of the present invention, the battery to be tested in the battery detection circuit is denoted as a battery to be tested 1, a battery to be tested 2, … …, and a battery to be tested N. In the battery detection circuit shown in fig. 1, the leakage currents of the battery 1 to be tested, the batteries 2 and … … to be tested and the battery N to be tested are sequentially I1、I2、……、IN. For the electric leakage of any one battery to be detected in the battery detection circuit, the magnitude of the electric leakage current generated by each battery to be detected is the same, so that: leakage current I for the battery 1 to be tested1The leakage currents generated by all the batteries to be tested are the same
And flows through the battery 1 to be tested through the first node A and the second node B; leakage current I for the battery 2 to be tested2The leakage currents generated by all the batteries to be tested are the same
And flows through the battery 2 via the first node a and the second node B; … …, respectively; leakage current I for battery NNThe leakage currents generated by all the batteries to be tested are the same
And flows through the battery N via the first node a and the second node B. Therefore, the current flowing through the branch in which the battery 1 to be tested, the battery 2 to be tested, … … to be tested and the battery N to be tested are:
wherein A is1For the current flowing through the battery branch in which the battery 1 to be tested is located, A2For the current flowing through the battery branch in which the battery 2 to be tested is located, ANIs the current flowing through the battery branch where the battery N to be tested is located.
Formula (1) can be rewritten as follows:
according to the formula (2), for any two batteries to be tested in the battery detection circuit, the currents in the battery branches where the battery x to be tested and the battery y to be tested are in the following relationship:
namely, the current difference of the battery branch where the battery x to be tested and the battery y to be tested are located is equal to the opposite number of the difference of the leakage currents of the battery x to be tested and the battery y to be tested.
If the leakage information of one battery to be tested in the battery detection circuit is known, for example, the leakage current I of the battery z to be testedzIf known, the leakage current of each battery to be tested can be calculated according to the current difference in each battery branch:
according to the principle, after the current in each battery branch is acquired by the current collector 200, the leakage current of the battery to be tested in each battery branch can be calculated according to the formula (4) based on the current of each battery branch, the current of the reference branch and the standard leakage current. Therefore, the battery detection circuit disclosed by the invention provides a circuit basis for simultaneously detecting a plurality of batteries to be detected.
In the technical solution disclosed in another embodiment of the present invention, the battery to be tested with known leakage current may be a real battery, may also be a simulated battery built based on technologies such as power electronics and electrochemistry, and may also be a programmable or controllable dc power supply, and the leakage current of the dc power supply may be adjustable.
Furthermore, after the leakage current of each battery to be tested is obtained through calculation, the voltage difference between the first node A and the second node B can be measured, and then the leakage resistance of each battery to be tested is directly calculated through ohm's law based on the leakage current and the voltage difference.
That is, a voltage collector may be further disposed in the circuit, and the voltage collector is configured to collect a voltage difference between the first node and the second node. And then uploading the voltage difference to a processor, and calculating the leakage resistance R of each battery to be tested by the processor based on a formula (5)1L、R2L、……、RNL，The R is1LLeakage resistance of the battery 1 to be tested, R2LLeakage resistance of the battery 1 to be tested, … …, RNLAnd the leakage resistance of the battery N to be tested.
Of course, if the leakage current of one of the batteries to be tested is 0, the leakage resistance is positive infinity, that is, there is no leakage.
In the technical solution disclosed in the embodiment of the present invention, the specific design form of the battery detection circuit may be set by a user, for example, it may be set as a symmetrical ring circuit topology structure shown in fig. 1, any one node on a positive loop in the symmetrical ring circuit topology structure may be used as a first node a, the node is electrically connected to the first end of each battery branch, the first end of each battery branch is connected to the positive loop, any one node on a negative loop in the symmetrical ring circuit topology structure may be used as a second node B, the node is electrically connected to the second end of each battery branch, and the second end of each battery branch is connected to the negative loop. Of course, the arrangement structure of the battery detection circuit may also be as shown in fig. 2, and the battery detection circuit shown in fig. 2 may implement parallel connection of battery branches in a two-wire connection manner, as shown in fig. 2, in the circuit arrangement of fig. 2, the first node a may be any node on a ring conductor L1, the first end of each battery branch is connected to the ring conductor L1, electrically connected to the first node a, the second node B may be any one of the nodes on the ring conductor L2, the second end of each battery branch is connected to the ring conductor L2, and electrically connected to the second node B, for convenience of circuit layout, the respective battery branches 100 may be distributed in the first direction Y, and the distance between the first nodes of two adjacent battery branches 100 is d1, and the distance between the second nodes of two adjacent battery branches 100 may also be d 1. The annular lead L1 is equivalent to two end-to-end leads, L11 and L12, in the Y direction, each battery branch 100 in the first direction Y is respectively marked as a first battery branch 100, a second battery branch 100, … … and an Nth battery branch 100, wherein the first end of the battery branch 100 which is an odd number is connected with the lead L11, and the first end of the battery branch 100 which is an even number is connected with the lead L12. The ring conductor L2 is equivalent to two end-to-end conductors L21 and L22 in the Y direction, wherein the second ends of the odd-numbered battery branches 100 are connected to the conductor L21, and the second ends of the even-numbered battery branches 100 are connected to the conductor L22.
In addition to collecting the current of each battery branch through the current collector 200 arranged in each battery branch, the present invention may calculate the current value of each battery branch through the output current of the current collector arranged on the above-mentioned positive loop or negative loop based on kirchhoff's current law, at this time, as shown in fig. 3, the first node or the second node is a node on the ring-shaped wire, at this time, the corresponding end of each battery branch is connected to the ring-shaped wire, because the ring-shaped wire is of a conductor structure, even if the connection end of each battery branch is not directly connected to the node, due to the conductive property of the ring-shaped wire, there is an electrical connection relationship between the connection end of each battery branch and the node. The number of the current collectors corresponds to the number of the battery branches one by one, the current collectors are arranged on the annular conducting wire in series, and the battery branches are alternately arranged with the current collectors at the connecting points of the annular conducting wire. Referring to fig. 3, taking the first node a as a node on the ring conductor as an example, the connection point a of the battery branch and the ring conductor is a, and the current collectors 200 and the connection points a are alternately distributed on the ring conductor.
The battery detection circuit can be used for arranging a plurality of batteries to be detected, and provides a circuit basis for simultaneously measuring the leakage/self-discharge/internal short circuit states of the plurality of batteries.
Corresponding to the circuit, the invention also discloses a battery detection method, and referring to fig. 4, the method comprises the following steps:
step S101: and obtaining branch current of each battery branch in the battery detection circuit.
The battery detection circuit may be the battery detection circuit disclosed in any of the above embodiments of the present invention, that is, the battery detection circuit has at least the following features: the battery detection circuit comprises a plurality of battery branches which are connected in parallel, a first end of each battery branch is electrically connected with a first node, a second end of each battery branch is electrically connected with a second node, a battery to be detected is arranged in each battery branch, one battery branch is marked as a reference branch, and the leakage current of the battery to be detected in the reference branch is a known quantity and is marked as a standard leakage current.
In this step, when obtaining the branch current of each battery branch in the battery detection circuit, the branch current of each battery branch may be directly obtained through the current collector arranged in each battery branch, or the branch current of each battery branch in the battery detection circuit may be obtained through calculation based on kirchhoff's current law and the current value collected by the current collector arranged in the positive loop or the negative loop in the battery detection circuit.
Step S102: and calculating the current difference value of the branch current of the reference branch and the branch current of each other battery branch.
In this step, after the direct current of each battery branch is obtained through calculation, the obtained branch currents are compared with the branch currents of the reference branch one by one, and the current difference value between the branch current of the reference branch and the branch currents of the other battery branches is obtained through calculation.
Step S103: and taking the sum of the standard leakage current and each calculated current difference value as the battery leakage current of the battery to be detected in the corresponding battery branch.
Specifically, step S103 can be represented by formula Ix＝Iz+(Az-Ax) In a manner that I isxFor the battery leakage current value of the battery to be tested, IZIs a standard leakage current, AxThe branch current value of the battery branch with the battery to be tested is AZIs the branch current value of the reference branch.
Specifically, after the step S102 is executed to calculate the branch current difference between one battery branch and the reference branch, the step S103 may be directly executed to calculate the battery leakage current of the reference battery in the battery branch, and then the step S102 is executed again, and after the branch current difference between the other battery branch and the reference branch is calculated, the step S103 may be directly executed, and the above-mentioned operation is repeated until the battery leakage currents of all the batteries to be tested are calculated. Or after the branch current difference between all battery branches and the standard leakage current is directly calculated and obtained in step S102, in step S103, the battery leakage current of all batteries to be tested is calculated and obtained.
Corresponding to the circuit, the method can calculate the battery leakage current value of each battery to be tested, and can further calculate the leakage resistance of each battery to be tested, that is, the method can further include: acquiring a voltage difference between the first node and the second node; calculating the voltage difference and the measured battery leakage current based on ohm's law to obtain the leakage resistance of each battery to be measured, namely,
the R isxIs the leakage resistance of the battery to be tested, IxFor leakage of the battery under testAnd the current value V is the voltage difference of the first node and the second node.
In the method, after the leakage current or the leakage resistance of each battery to be tested is calculated, in order to facilitate a user to quickly know the use state of each battery to be tested, referring to fig. 5, the method may further include the following steps:
step S201: and acquiring standard leakage current/standard leakage resistance matched with the battery to be detected in each battery branch.
The standard leakage current/standard leakage resistance is a leakage current/leakage resistance which is preset by a user and is matched with the type of the battery to be detected in each battery branch, and can be set according to the specific type of the battery to be detected, namely, the user can set different standard leakage currents/standard leakage resistances according to the type of the detected battery to be detected.
Step S202: and calculating the ratio of the battery leakage current/leakage resistance of the battery to be tested in the same battery branch to the standard leakage current/standard leakage resistance.
Step S203: and acquiring and outputting prompt information matched with the ratio.
In the invention, a plurality of prompt messages can be preset, the prompt messages are used for representing the use state of the battery to be tested, after the ratio of the battery leakage current of the battery to be tested to the standard leakage current matched with the battery leakage current is obtained through calculation, the range of the range to which the ratio belongs is judged, then the prompt messages matched with the range of the range are called, then the prompt messages and the identification messages corresponding to the battery branches are output as detection results, a user can judge the specific position of the battery to be tested corresponding to the prompt messages through the identification messages, and the specific state of the battery to be tested is judged through the prompt messages.
Corresponding to the method and the circuit, the invention also discloses a battery detection device, which comprises: the battery detection circuit and the processor have the advantages that the specific execution process of the processor corresponds to the method;
in this scheme, the input pin of the processor is connected to the output terminal of the current collecting device in the battery detection circuit, and the processor is configured to:
calculating a branch current of each battery branch in the battery detection circuit according to a current value output by a current collector in the battery detection circuit; calculating the current difference value of the branch current of the reference branch and the branch current of each other battery branch; and taking the sum of the standard leakage current and each calculated current difference value as the battery leakage current of the battery to be detected in the corresponding battery branch.
Corresponding to the method above, the processor is further configured to:
acquiring the voltage difference between the first node and the second node in the battery detection circuit through a voltage collector; and calculating the voltage difference and the measured battery leakage current based on ohm's law to obtain the leakage resistance of each battery to be measured.
Corresponding to the method above, the processor is further configured to: acquiring standard leakage current/standard leakage resistance matched with the battery to be detected in each battery branch; calculating the ratio of the battery leakage current/leakage resistance of the battery to be tested in the same battery branch circuit to the standard leakage current/standard leakage resistance; and acquiring and outputting prompt information matched with the ratio, wherein the prompt information can also comprise identification information of the battery branch.
Corresponding to the above method, when the branch current of each battery branch in the battery detection circuit is calculated by the current value output by the current collector in the battery detection circuit, the processor is specifically configured to:
acquiring branch current of each battery branch through a current collector in each battery branch arranged in the battery detection circuit;
or the like, or, alternatively,
and calculating the branch current of each battery branch in the battery detection circuit according to the kirchhoff current law by using the current value acquired by the current collector arranged in the positive loop or the negative loop of the battery detection circuit.
In conclusion, the scheme provided by the invention can realize batch detection of the batteries to be detected, and improves the detection speed of the batteries to be detected.
For convenience of description, the above system is described with the functions divided into various modules, which are described separately. Of course, the functionality of the various modules may be implemented in the same one or more software and/or hardware implementations of the invention.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
It is further noted that, herein, 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 phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A battery detection circuit, comprising:
a plurality of battery branches connected in parallel with each other;
the first end of each battery branch is electrically connected with the first node, the second end of each battery branch is electrically connected with the second node, and each battery branch is provided with a battery to be tested, wherein one battery branch is marked as a reference branch, and the leakage current of the battery to be tested in the reference branch is a known quantity;
the current collector is used for directly or indirectly detecting the current in each battery branch;
the battery detection circuit is also used for recording the leakage current of the battery to be detected in the reference branch as standard leakage current and calculating the current difference value of the branch current of the reference branch and each other battery branch; and taking the sum of the standard leakage current and each calculated current difference value as the battery leakage current of the battery to be detected in the corresponding battery branch.
2. The battery detection circuit of claim 1, wherein the number of current collectors corresponds to the number of battery branches, and each current collector is disposed in one battery branch.
3. The battery detection circuit according to claim 1, wherein the first node or the second node is a node on a ring-shaped wire, the number of the current collectors corresponds to the number of the battery branches one to one, the current collectors are arranged in series on the ring-shaped wire, and the connection points of the battery branches on the ring-shaped wire and the current collectors are alternately arranged.
4. The battery detection circuit of claim 1,
each battery branch is distributed along a first direction;
the first end of each battery branch is electrically connected with the first node through a first conducting wire, the first conducting wire is a ring-shaped conducting wire, and the first node is any one connecting point which is electrically connected with the first end of each battery branch on the first conducting wire;
the second end of each battery branch is electrically connected with the second node through a second conducting wire, the second conducting wire is an annular conducting wire, and the second node is any one connecting point which is electrically connected with the second end of each battery branch on the second conducting wire.
5. A battery testing method, comprising:
the method comprises the steps that the branch current of each battery branch in a battery detection circuit is obtained, the battery detection circuit comprises a plurality of battery branches which are connected in parallel, namely, the first end of each battery branch is electrically connected with a first node, the second end of each battery branch is electrically connected with a second node, a battery to be detected is arranged in each battery branch, one battery branch is marked as a reference branch, and the leakage current of the battery to be detected in the reference branch is a known quantity and is marked as standard leakage current;
calculating the current difference value of the branch current of the reference branch and the branch current of each other battery branch;
and taking the sum of the standard leakage current and each calculated current difference value as the battery leakage current of the battery to be detected in the corresponding battery branch.
6. The battery test method of claim 5, further comprising:
acquiring a voltage difference between the first node and the second node;
and calculating the leakage resistance of each battery to be tested by adopting the voltage difference and the measured battery leakage current based on ohm's law.
7. The battery test method of claim 5, further comprising:
acquiring standard leakage current matched with the battery to be tested in each battery branch;
calculating the ratio of the battery leakage current of the battery to be tested in the same battery branch to the standard leakage current;
and acquiring and outputting prompt information matched with the ratio.
8. The battery detection method according to claim 5, wherein the obtaining of the branch current of each battery branch in the battery detection circuit specifically includes:
acquiring branch current of each battery branch through a current collector in each battery branch arranged in the battery detection circuit;
or the like, or, alternatively,
the branch current of each battery branch in the battery detection circuit is obtained through calculation according to the kirchhoff current law and the current value collected by a current collector arranged in a positive loop or a negative loop in the battery detection circuit, the first end of each battery branch of the battery detection circuit is connected to the positive loop, and the second end of each battery branch of the battery detection circuit is connected to the negative loop.
9. A battery test apparatus, comprising: the battery detection circuit of any of claims 1-4, and a processor;
the leakage current of the battery to be tested in the reference branch is marked as standard leakage current;
the processor is configured to:
calculating branch current of each battery branch in the battery detection circuit according to a current value output by a current collector in the battery detection circuit; calculating the current difference value of the branch current of the reference branch and the branch current of each other battery branch; and taking the sum of the standard leakage current and each calculated current difference value as the battery leakage current of the battery to be detected in the corresponding battery branch.
10. The battery test apparatus of claim 9, wherein the processor is further configured to:
acquiring a voltage difference between a first node and a second node in the battery detection circuit; and calculating the leakage resistance of each battery to be tested by adopting the voltage difference and the measured battery leakage current based on ohm's law.
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