CN104655975A

CN104655975A - Identification method for micro short circuit of battery

Info

Publication number: CN104655975A
Application number: CN201510067979.9A
Authority: CN
Inventors: 张明轩; 欧阳明高; 卢兰光; 何向明
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2015-02-09
Filing date: 2015-02-09
Publication date: 2015-05-27
Anticipated expiration: 2035-02-09
Also published as: CN104655975B

Abstract

The invention discloses an identification method for micro short circuit of a battery. A connection conductor with a self-balancing function is arranged in a banked battery; a resistor and a voltage detection device are arranged in the connection conductor with the self-balancing function; the resistor has self-balancing voltage corresponding to self-balancing current of the banked battery; the method can be used for identifying whether the banked battery has micro short circuit or not by comparing the size of the voltage detected by the voltage detection device with the size of the self-balancing voltage. The invention also provides a method for determining which battery unit in the banked battery has the micro short circuit. The identification method for micro short circuit of batteries plays a key role of improving the safety of products using the banked battery.

Description

The recognition methods of battery micro-short circuit

Technical field

The invention belongs to cell art, be specifically related to a kind ofly carry out knowledge method for distinguishing to the micro-short circuit phenomenon that batteries in parallel connection group occurs in operational process.

Background technology

In recent years, the safety hazards of lithium-ion-power cell is even generation, most safety problems of lithium-ion-power cell can be undertaken controlling or alleviating by the exterior measures such as electrical management or temperature treatment, but, the thermal runaway caused by micro-short circuit is the most thorny problem be difficult to resolve in all safety problems, and it can not effectively be controlled by the exterior measures such as existing electrical management or temperature treatments and be alleviated.

So-called micro-short circuit refers to the small short circuit phenomenon that (being called external short circuit) between battery cell inside (being called internal short-circuit) or the positive and negative terminals of battery cell occurs.In cell fabrication processes being mixed into of impurity, diaphragm quality is not up to standard, composition electric battery tab welding time welding bubble, in battery use procedure the crimp etc. falling material or battery of pole piece all can cause the generation of battery micro-short circuit.Will directly cause battery to burn out at the battery generation micro-short circuit initial stage, but the phenomenons such as lithium ion battery self discharge is large, capacity is low can be caused, and large-scale short circuit phenomenon may be developed in the follow-up use procedure of battery, thus cause battery catches fire to explode.

At present, the discovery of battery micro-short circuit and prediction are still difficult points in cell safety problem.Prior art usually detects battery by the method for testing its pressure drop after battery is shelved a period of time and whether micro-short circuit occurs, this method not only takes time and effort, reliability is low, and can not in time the micro-short circuit phenomenon of the generation in battery use procedure be identified and be detected, the micro-short circuit occurred in cell operation may be made to be converted to large-scale short circuit phenomenon, to occur serious potential safety hazard.

Summary of the invention

In view of this, necessaryly a kind of battery micro-short circuit recognition methods can carrying out real-time detection and Identification to the micro-short circuit phenomenon occurred in cell operation is provided.

A recognition methods for battery micro-short circuit, comprising:

S1, one electric battery in parallel is provided, this batteries in parallel connection group comprises N number of parallel branch, a cathode output end and a cathode output end, described N number of parallel branch is all by described cathode output end and the outside output current of cathode output end, parallel branch described in each includes a battery cell, wherein, N > 1;

S2, one closed-loop shaped bonding conductor is set in described batteries in parallel connection group, this closed-loop shaped bonding conductor and parallel branch described in each all have a tie point, and this closed-loop shaped bonding conductor is electrically connected with the negative or positive electrode of described N number of battery cell by N number of described tie point simultaneously and forms an annular channels;

S3, the closed-loop shaped bonding conductor often between adjacent two described battery cells all arranges a resistance, difference one first voltage check device in parallel and one second voltage check device on any two described resistance;

S4, in this batteries in parallel connection group operational process, has one from euqalizing current I in this closed-loop shaped bonding conductor _spass through, resistance described in each all have one with should from euqalizing current I _scorresponding to equalizing voltage V _s, detecting should from equalizing voltage V _s, and setting a voltage pre-set threshold value, described voltage pre-set threshold value is described from equalizing voltage V _smore than 3 times of absolute value;

S5, in this batteries in parallel connection group operational process, the voltage V that the first voltage check device described in Real-time Collection detects _awith the voltage V that described second voltage check device detects _b, when V being detected _aand V _bin any one absolute value when being greater than described voltage pre-set threshold value, judge that this batteries in parallel connection group there occurs micro-short circuit.

A recognition methods for battery micro-short circuit, comprising:

S1, one electric battery in parallel is provided, this batteries in parallel connection group comprises N number of parallel branch, a cathode output end and a cathode output end, described N number of parallel branch is all by described cathode output end and the outside output current of cathode output end, parallel branch described in each includes a battery cell, wherein, N is even number;

S3, the closed-loop shaped bonding conductor often between adjacent two described battery cells all arranges a resistance, resistor in parallel one voltage check device described in any one;

S5, in this batteries in parallel connection group operational process, the voltage that voltage check device described in Real-time Collection detects, when the absolute value of the voltage that this voltage check device detects is greater than described voltage pre-set threshold value, judges that this batteries in parallel connection group there occurs micro-short circuit.

A recognition methods for battery micro-short circuit, comprising:

S2, one non-enclosed bonding conductor is set in described batteries in parallel connection group, this non-enclosed bonding conductor and parallel branch described in each all have a tie point, and this closed-loop shaped bonding conductor is electrically connected with the negative or positive electrode of described N number of battery cell by N number of described tie point simultaneously;

S3, the described non-enclosed bonding conductor often between adjacent two described battery cells all arranges a resistance 300, resistor in parallel one voltage check device described in any one;

S4, in this batteries in parallel connection group operational process, has one from euqalizing current I in this non-enclosed bonding conductor _spass through, resistance described in each all have one with should from euqalizing current I _scorresponding to equalizing voltage V _s, detecting should from equalizing voltage V _s, and setting a voltage pre-set threshold value, described voltage pre-set threshold value is described from equalizing voltage V _smore than 3 times of absolute value;

S5, in this batteries in parallel connection group operational process, the voltage that described in Real-time Collection, voltage check device 400 detects, when the absolute value of the voltage that this voltage check device detects is greater than described voltage pre-set threshold value, judges that this batteries in parallel connection group there occurs micro-short circuit.

A recognition methods for battery micro-short circuit, comprising:

S1, one electric battery in parallel is provided, this batteries in parallel connection group comprises N number of parallel branch, a cathode output end and a cathode output end, described N number of parallel branch is all by described cathode output end and the outside output current of cathode output end, parallel branch described in each includes M the battery cell be connected in series, wherein, N > 1, M > 1;

S2, the battery cell being positioned at same row in described N number of parallel branch is formed one group, form M battery cell group, battery cell group described in each includes N number of described battery cell, M+1 closed-loop shaped bonding conductor is set in described batteries in parallel connection group, described closed-loop shaped bonding conductor and described battery cell group are arranged alternately, closed-loop shaped bonding conductor described in each and parallel branch described in each all have a tie point, and this closed-loop shaped bonding conductor is electrically connected with the negative or positive electrode of N number of battery cell described in a described battery cell group by N number of described tie point simultaneously;

S3, for closed-loop shaped bonding conductor described in each, is often all arranging a resistance between adjacent two described tie points, difference one first voltage check device in parallel and one second voltage check device on any two described resistance;

S4, in this batteries in parallel connection group operational process, all has one from euqalizing current I in closed-loop shaped bonding conductor described in each _sflow through, resistance described in each all have one with should from euqalizing current I _scorresponding to equalizing voltage V _s, detecting should from equalizing voltage V _s, and setting a voltage pre-set threshold value, described voltage pre-set threshold value is described from equalizing voltage V _smore than 3 times of absolute value;

S5, in this batteries in parallel connection group operational process, the voltage V that Real-time Collection first voltage check device described in each detects _awith the voltage V that the second voltage check device described in each detects _b, when detecting in adjacent two described closed-loop shaped bonding conductors, the V of closed-loop shaped bonding conductor described in each _aand V _bin any one absolute value when being all greater than described voltage pre-set threshold value, judge that two described closed-loop shaped bonding conductors adjacent with this are electrically connected described battery cell group simultaneously and there occurs micro-short circuit.

A recognition methods for battery micro-short circuit, comprising:

S1, one electric battery in parallel is provided, this batteries in parallel connection group comprises N number of parallel branch, a cathode output end and a cathode output end, described N number of parallel branch is all by described cathode output end and the outside output current of cathode output end, parallel branch described in each includes M the battery cell be connected in series, wherein, N is even number, M > 1;

S3, for closed-loop shaped bonding conductor described in each, is often all arranging a resistance between adjacent two described tie points, resistor in parallel one voltage check device described in any one;

S5, in this batteries in parallel connection group operational process, the voltage that Real-time Collection voltage check device described in each detects, when the absolute value of voltage that the voltage check device in adjacent two described closed-loop shaped bonding conductors detects all is greater than described voltage pre-set threshold value, judges that two described closed-loop shaped bonding conductors adjacent with this are electrically connected described battery cell group simultaneously and there occurs micro-short circuit.

The present invention arranges the bonding conductor had from proportionality action in batteries in parallel connection group, and have at this resistance and voltage check device are set in the bonding conductor of proportionality action, this resistance have one with this batteries in parallel connection group from euqalizing current corresponding from equalizing voltage, by comparing this voltage check device voltage detected and the size of being somebody's turn to do from equalizing voltage, just can identify this batteries in parallel connection group and whether there occurs micro-short circuit.The recognition methods of battery micro-short circuit provided by the invention has key effect for the raising of the security using the product of batteries in parallel connection group.

Accompanying drawing explanation

The schematic diagram that closed-loop shaped bonding conductor, resistance and voltage check device are set in batteries in parallel connection group that Fig. 1 a provides for first embodiment of the invention; Fig. 1 b is the topology diagram of element annexation in Fig. 1 a dotted line frame.

Fig. 2 be first embodiment of the invention counter push away which battery cell 120 occur micro-short circuit principle illustrate schematic diagram.

Fig. 3 a, 3b, 3c, 3d be first embodiment of the invention embodiment 1 when N be even number and y ∈ [1, N/2) time, instead push away the explanation schematic diagram that micro-short circuit battery cell method for numbering serial occurs.

Fig. 4 a, 4b, 4c, 4d be first embodiment of the invention embodiment 1 when N be even number and y ∈ (N/2, N) time, instead push away the explanation schematic diagram that micro-short circuit battery cell method for numbering serial occurs.

Fig. 5 a, 5b be first embodiment of the invention embodiment 1 when N be even number and y=N/2 time, instead push away the explanation schematic diagram that micro-short circuit battery cell method for numbering serial occurs.

The schematic diagram that closed-loop shaped bonding conductor, resistance and voltage check device are set in batteries in parallel connection group that Fig. 6 a provides for second embodiment of the invention; Fig. 6 b is the topology diagram of element annexation in Fig. 6 a dotted line frame.

The schematic diagram that closed-loop shaped bonding conductor, resistance and voltage check device are set in batteries in parallel connection group that Fig. 7 provides for third embodiment of the invention.

The schematic diagram that non-enclosed bonding conductor, resistance and voltage check device are set in batteries in parallel connection group that Fig. 8 provides for fourth embodiment of the invention.

The schematic diagram that closed bonding conductor, resistance and voltage check device are set in batteries in parallel connection group that Fig. 9 provides for fifth embodiment of the invention.

Main element symbol description

Batteries in parallel connection group 100,500

Parallel branch 110,510

Battery cell 120

Battery cell group 520

Cathode output end 130

Cathode output end 140

Closed-loop shaped bonding conductor 210,220,230

Non-enclosed bonding conductor 240

Tie point 211,221,231,241

Resistance 300

Current sensing means 400,410,420

Following embodiment will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.

Embodiment

Be described in further detail below with reference to the recognition methods of drawings and the specific embodiments to battery micro-short circuit provided by the invention.

Refer to Fig. 1, first embodiment of the invention provides a kind of recognition methods of battery micro-short circuit, comprising:

S11, one electric battery 100 in parallel is provided, this batteries in parallel connection group 100 comprises N number of parallel branch 110, cathode output end 130 and a cathode output end 140, described N number of parallel branch 110 is all by described cathode output end 130 and cathode output end 140 outwards output current, parallel branch 110 described in each includes a battery cell 120, wherein, N > 1;

S12, one closed-loop shaped bonding conductor 210 is set in described batteries in parallel connection group 100, this closed-loop shaped bonding conductor 210 all has one first tie point 211 with parallel branch 110 described in each, and this closed-loop shaped bonding conductor 210 is electrically connected and forms an annular channels with the negative or positive electrode of described N number of battery cell 120 by N number of described first tie point 211 simultaneously;

S13, the closed-loop shaped bonding conductor 210 often between adjacent two described battery cells 120 all arranges a resistance 300, difference one first voltage check device 410 and one second voltage check device 420 in parallel on any two described resistance 300;

S14, in this batteries in parallel connection group 100 operational process, has one from euqalizing current I in this closed-loop shaped bonding conductor 210 _spass through, resistance 300 described in each all have one with should from euqalizing current I _scorresponding to equalizing voltage V _s, detecting should from equalizing voltage V _s, and setting a voltage pre-set threshold value, described voltage pre-set threshold value is described from equalizing voltage V _smore than 3 times of absolute value;

S15, in this batteries in parallel connection group 100 operational process, the voltage V that described in Real-time Collection, the first voltage check device 410 detects _awith the voltage V that described second voltage check device 420 detects _b, when V being detected _aand V _bin any one absolute value when being greater than described voltage pre-set threshold value, judge that this batteries in parallel connection group 100 there occurs micro-short circuit.

In step s 11, described N number of parallel branch 110 is connected in parallel.Described cathode output end 130 and described cathode output end 140 are respectively two shared end points of described N number of parallel branch 110, described N number of parallel branch 110 is all by described cathode output end 130 and cathode output end 140 outwards output power electric current, and the power current that this batteries in parallel connection group 100 exports is the power current sum of the output of described N number of parallel branch 110.Described battery cell 120 can be but be not limited to lithium ion battery, nickel-cadmium battery, Ni-MH battery, alkali manganese rechargeable battery or lead accumulator.In this batteries in parallel connection group 100 operational process, battery cell 120 described in each is all by the parallel branch 110 corresponding with it outwards output power electric current.

In step s 12, described closed-loop shaped bonding conductor 210 is a conductor with uniform resistance.In embodiments of the present invention, described closed-loop shaped bonding conductor 210 is joined end to end by a straight wire and is formed.Described closed-loop shaped bonding conductor 210 can be electrically connected with the positive pole of described N number of battery cell 120 simultaneously, also can be connected with the negative electricity of described N number of battery cell 120 simultaneously.Described closed-loop shaped bonding conductor 210 has with parallel branch 110 described in each and only has described first tie point 211.N number of described first tie point 211 interval does not overlap.

This N number of battery cell 120 realizes from balanced by described closed-loop shaped bonding conductor 210, namely described closed-loop shaped bonding conductor 210 can make the power current equalization flowing through each battery cell 120, thus improves the reliability and stability of described batteries in parallel connection group 100.Under normal circumstances, when namely micro-short circuit does not occur this batteries in parallel connection group 100, only have from euqalizing current I in described closed-loop shaped bonding conductor 210 _spass through, should from euqalizing current I _svery little, be generally 1 ~ 2mA, resistance 300 described in each all have one with should from euqalizing current I _scorresponding to equalizing voltage V _s.If there is a described battery cell 120 to there occurs micro-short circuit in this batteries in parallel connection group 100, then in this batteries in parallel connection group 100, other all battery cells 120 all can have electric current to flow to location of short circuit by described closed-loop shaped bonding conductor 210, the electric current that this situation produces is called short-circuit current by the present invention, when having short-circuit current to flow through in described resistance 300, this resistance 300 has a short-circuit voltage corresponding with this short-circuit current.Described in each battery cell 120 produce short-circuit current can be the supreme kilo-ampere of hundreds of milliampere, this short-circuit current much larger than this from euqalizing current I _s, therefore described short-circuit voltage also much larger than described from equalizing voltage V _s, can judge whether have micro-short circuit phenomenon to occur in described batteries in parallel connection group 100 thus.

In step s 13, described resistance 300 is arranged between adjacent two described first tie points 211, and be provided with N number of described resistance 300 altogether in described batteries in parallel connection group 100, the resistance of described N number of resistance 300 is substantially identical.After setting described first voltage check device 410 and the second voltage check device 420, can be numbered described N number of battery cell 120 further.Particularly, with described first voltage check device 410 for starting point, successively described N number of battery cell 120 is numbered according to clock-wise order, is respectively 1,2N-1, N battery cell, then described first voltage check device 410 is arranged between No. N and No. 1 battery cell.Setting described second voltage check device 420 is arranged between No. y and (y+1) number battery cell, and y ∈ [1, N), after step s 12, y is a known numerical value.Also can be numbered described N number of resistance 300 further, the numbering of numbering and its counter clockwise direction first battery cell 120 of resistance 300 described in each is identical, such as, the resistance 300 between No. 1 battery cell and No. 2 battery cells is numbered No. 1 resistance.Be appreciated that and additive method also can be adopted to be numbered described N number of battery cell 120 and resistance 300, such as, can be numbered described N number of battery cell 120 according to sequence counter-clockwise.

In step S14, the actual moving process of this batteries in parallel connection group 100 can be simulated in advance, detect described from equalizing voltage V _s.Also can when this batteries in parallel connection group 100 actual motion have just started to carry out, the voltage sets described first voltage check device 410 or described second voltage check device 420 detected is described from equalizing voltage V _s.Those skilled in the art also can adjust described voltage pre-set threshold value as required, such as, can be adjusted to described from equalizing voltage V _smore than 5 times, more than 10 times, more than 20 times of absolute value etc.Preferably, described voltage pre-set threshold value is described from equalizing voltage V _s5 ~ 1000 times of absolute value.

In step S15, setting x battery cell there occurs micro-short circuit phenomenon in described batteries in parallel connection group 100 operational process, because described closed-loop shaped bonding conductor 210 is enclosed annular path, the short-circuit current that battery cell 120 described in each produces all has two paths can flow to x battery cell, now, the short-circuit current that this battery cell 120 produces can select the shortest path to flow to x battery cell, and the present invention is referred to as shortest path principle.When N is odd number, according to above-mentioned numbering principle, do not have short-circuit current and pass through in topological structure with the symmetrically arranged resistance 300 of battery cell 120 that micro-short circuit occurs, all have short-circuit current in other resistance 300 to pass through, such as shown in Fig. 1 b when (N+1)/No. 2 battery cell generation micro-short circuit, do not have short-circuit current in N resistance to pass through, therefore described first voltage check device 410 can't detect described short-circuit voltage, but have short-circuit current in y resistance to pass through, therefore described second voltage check device 420 can detect described short-circuit voltage.When N is even number, no matter which battery cell 120 there occurs micro-short circuit, all has short-circuit current and pass through in all resistance 300, and described first voltage check device 410 and the second voltage check device 420 all can detect described short-circuit voltage.Therefore, two voltage check devices in parallel need only be distinguished on any two resistance 300, when any one voltage check device detects much larger than described from equalizing voltage V _sshort-circuit voltage time, can judge that this batteries in parallel connection group 100 there occurs micro-short circuit.

Be appreciated that and also can distinguish multiple voltage check device in parallel on multiple resistance 300, when any one voltage check device detects much larger than described from equalizing voltage V _sshort-circuit voltage time, can judge that this batteries in parallel connection group 100 there occurs micro-short circuit.Be appreciated that, when this batteries in parallel connection group 100 comprises battery cell 120 described in even number, only need on a described resistance 300 current sensing means in parallel, now, there is micro-short circuit in arbitrary described battery cell 120, this voltage check device all can detect much larger than described from equalizing voltage V _sshort-circuit voltage.

Determining after this batteries in parallel connection group 100 there occurs micro-short circuit, also can judge that concrete which battery cell 120 there occurs micro-short circuit further.Illustrate in the anti-mode pushed away below and first embodiment of the invention judged that the method which battery cell 120 there occurs micro-short circuit is described.Refer to Fig. 2, when No. 5 battery cell generation micro-short circuit, according to shortest path principle, the short-circuit current of No. 1, No. 7 and No. 6 battery cell generations will flow to No. 5 battery cells in the counterclockwise direction, and the short-circuit current of No. 2, No. 3 and No. 4 battery cell generations will flow to No. 5 battery cells along clockwise direction, the voltage direction of known No. 7 resistance is that counterclockwise the voltage direction of No. 3 resistance is clockwise direction; According to parallel circuit shunting principle; the known short-circuit current only having No. 1 battery cell to produce flows through No. 7 resistance; and the short-circuit current of No. 2, No. 3 battery cell generations all flows through No. 3 resistance; because prior art can select the good battery cell of consistance to form electric battery usually; therefore the short-circuit current of each battery cell 120 generation is basically identical; and the resistance of each resistance 300 is also substantially identical, then the voltage ratio that known first voltage check device 410 and the second voltage check device 420 detect is-2/1.Known according to above analysis, for the described batteries in parallel connection group 100 that N, y are known, can according to V _aand V _bvoltage direction and ratio is counter pushes away x value, can judge that concrete which battery cell 120 there occurs micro-short circuit.By according to above-mentioned analysis, first embodiment of the invention is judged that the method that micro-short circuit occurs which battery cell 120 describes in detail further below.

The clockwise direction of described closed-loop shaped bonding conductor 210 is set as reference voltage direction by first embodiment of the invention.The sizes values of the short-circuit current that battery cell described in each 120 also produces by the present invention is set as i, and the resistance of each resistance 300 is set as R.

In embodiment 1, described closed-loop shaped bonding conductor 210 is electrically connected with the positive pole of described N number of battery cell 120 simultaneously.

One, Fig. 3 to Fig. 5 is referred to, when N is even number, if x battery cell there occurs micro-short circuit, the two paths length then flowing to x battery cell with the short-circuit current that the symmetrically arranged battery cell of x battery cell 120 produces are identical, thus this short-circuit current will be equally divided into two parts respectively along clockwise direction with counterclockwise flow to x battery cell.

1. when y ∈ [1, N/2) time:

(1) Fig. 3 a is referred to, if x is ∈ [1, y], then V _a>0, V _b<0, and V _a=[N-(x+N/2)+1/2] iR, V _b=-[(x+N/2)-(y+1)+1/2] iR, can draw:

\frac{V_{A}}{V_{B}} = \frac{N + 1 - 2 x}{1 + 2 y - N - 2 x}

Formula 1

(2) Fig. 3 b is referred to, if x ∈ (y, N/2], then V _a>0, V _b>0, and V _a=[N-(x+N/2)+1/2] iR, V _b=[N-(x+N/2)+1/2+y] iR, can draw:

\frac{V_{A}}{V_{B}} = \frac{N + 1 - 2 x}{1 + 2 y + N - 2 x}

Formula 2

(3) Fig. 3 c is referred to, if x ∈ (N/2, y+N/2], then V _a<0, V _b<0, and V _a=-[x-N/2-1+1/2] iR, V _b=[y-(x-N/2)+1/2] iR, can draw:

\frac{V_{A}}{V_{B}} = \frac{N + 1 - 2 x}{1 + 2 y + N - 2 x}

Formula 2

(4) Fig. 3 d is referred to, if x ∈ (y+N/2, N], then V _a<0, V _b<0, and V _a=-[(x-N/2)-1+1/2] iR, V _b=-[(x-N/2)-(y+1)+1/2] iR, can draw:

\frac{V_{A}}{V_{B}} = \frac{N + 1 - 2 x}{1 + 2 y + N - 2 x}

Formula 2

2. as y ∈ (N/2, N):

(1) Fig. 4 a is referred to, if x is ∈ [1, y-N/2], then V _a>0, V _b>0, and V _a=[N-(x+N/2)+1/2] iR, V _b=[y-(x+N/2)+1/2] iR, can draw:

\frac{V_{A}}{V_{B}} = \frac{N + 1 - 2 x}{1 + 2 y - N - 2 x}

Formula 1

(2) Fig. 4 b is referred to, if x ∈ (y-N/2, N/2], then V _a>0, V _b<0, and V _a=[N-(x+N/2)+1/2] iR, V _b=-[(x+N/2)-(y+1)+1/2] iR, can draw:

\frac{V_{A}}{V_{B}} = \frac{N + 1 - 2 x}{1 + 2 y - N - 2 x}

Formula 1

(3) Fig. 4 c is referred to, if x ∈ (N/2, y], then V _a<0, V _b<0, and V _a=-[(x-N/2)-1+1/2] iR, V _b=-[(x-N/2)-1+1/2+N-y] iR, can draw:

\frac{V_{A}}{V_{B}} = \frac{N + 1 - 2 x}{1 + 2 y - N - 2 x}

Formula 1

(4) Fig. 4 d is referred to, if x ∈ (y, N], then V _a<0, V _b>0, and V _a=-[(x-N/2)-1+1/2] iR, V _b=[y-(x-N/2)+1/2] iR, can draw:

\frac{V_{A}}{V_{B}} = \frac{N + 1 - 2 x}{1 + 2 y + N - 2 x}

Formula 2

3. as y=N/2:

(1) 5a is referred to, if x is ∈ [1, N/2], then V _a>0, V _b<0, and V _a=[N-(x+N/2)+1/2] iR, V _b=-[(x+N/2)-(N/2+1)+1/2] i=-[(x+N/2)-(y+1)+1/2] iR, can draw:

\frac{V_{A}}{V_{B}} = \frac{N + 1 - 2 x}{1 + 2 y - N - 2 x}

Formula 1

(2) 5b is referred to, if x is ∈ [N/2, N], then V _a<0, V _b>0, and V _a=-[(x-N/2)-1+1/2] iR, V _b=[N/2-(x-N/2)+1/2] i=[y-(x-N/2)+1/2] iR, can draw:

\frac{V_{A}}{V_{B}} = \frac{N + 1 - 2 x}{1 + 2 y + N - 2 x}

Formula 2

Analyze in conjunction with above, due to after step s 14, N, y, I _a, I _bvalue be known, therefore after step s 14, adopt following method to calculate x:

As y ∈ [1, N/2]:

(1) if V _b>0, or V _b<0 and V _a<0, then utilize formula 2 to calculate x;

(2) if V _b<0 and V _a>0, then utilize formula 1 to calculate x.

As y ∈ (N/2, N):

(1) if V _a>0, or V _a<0 and V _b<0, then utilize formula 1 to calculate x;

(2) if V _a<0 and V _b>0, then utilize formula 2 to calculate x.

Two, when N is odd number, derivation when being even number with reference to above-mentioned N, has:

1. when y ∈ [1, (N-1)/2]:

(1) if x is ∈ [1, y], then V _a>0, V _b<0, and

\frac{V_{A}}{V_{B}} = \frac{N + 1 - 2 x}{1 + 2 y - N - 2 x}

Formula 1

(2) if x ∈ (y, (N-1)/2], then V _a>0, V _b>0, and

\frac{V_{A}}{V_{B}} = \frac{N + 1 - 2 x}{1 + 2 y + N - 2 x}

Formula 2

(3) if x=(N+1)/2, then V _a=0, V _b>0;

(4) if x is ∈ ((N+1)/2, y+ (N-1)/2), then V _a<0, V _b>0, and

\frac{V_{A}}{V_{B}} = \frac{N + 1 - 2 x}{1 + 2 y + N - 2 x}

Formula 2

(5) if x=y+ (N-1)/2, then V _a<0 and V _b=0;

(6) if x ∈ (y+ (N-1)/2, N], then V _a<0, V _b<0, and

\frac{V_{A}}{V_{B}} = \frac{N + 1 - 2 x}{1 + 2 y + N - 2 x}

Formula 2

2. when y ∈ [(N+1)/2), N) time:

(1) if x ∈ [1, y-(N-1)/2), then V _a>0, V _b>0, and

\frac{V_{A}}{V_{B}} = \frac{N + 1 - 2 x}{1 + 2 y - N - 2 x}

Formula 1

(2) if x=y-(N-1)/2, then V _a>0, V _b=0;

(3) if x is ∈ (y-(N-1)/2, (N+1)/2), then V _a>0, V _b<0, and

\frac{V_{A}}{V_{B}} = \frac{N + 1 - 2 x}{1 + 2 y - N - 2 x}

Formula 1

(4) if x=(N+1)/2, then V _a=0, V _b<0;

(5) if x is ∈ (N+1)/2, y], then V _a<0, V _b<0, and

\frac{V_{A}}{V_{B}} = \frac{N + 1 - 2 x}{1 + 2 y - N - 2 x}

Formula 1

(6) if x ∈ (y, N], then V _a<0, V _b>0, and

\frac{V_{A}}{V_{B}} = \frac{N + 1 - 2 x}{1 + 2 y + N - 2 x}

Formula 2

Analyze in conjunction with above, after step s 14, adopt following method to calculate x:

When y ∈ [1, (N-1)/2]:

(1) if V _a=0 and V _b>0, then x=(N+1)/2;

(2) if V _a<0 and V _b=0, then x=y+ (N-1)/2;

(3) if V _b>0, or V _b<0 and V _a<0, then utilize formula 2 to calculate x;

(4) if V _b<0 and V _a>0, then utilize formula 1 to calculate x.

When y ∈ [(N+1)/2), N) time:

(1) if V _a=0 and V _b<0, then x=(N+1)/2;

(2) if V _a>0 and V _b=0, then x=y-(N-1)/2;

(3) if V _a>0, or V _a<0 and V _b<0, then utilize formula 1 to calculate x;

(4) if V _a<0 and V _b>0, then utilize formula 2 to calculate x.

In example 2, described closed-loop shaped bonding conductor 210 is connected with the negative electricity of described N number of battery cell 120 simultaneously.

When N, y, x are all known, compared with described closed-loop shaped bonding conductor 210 is electrically connected with the positive pole of described N number of battery cell 120 by embodiment 1 simultaneously, the V that embodiment 2 detects _athe V detected with embodiment 1 _avoltage direction phase absolute value of voltage equal and opposite in direction on the contrary, the V that embodiment 2 detects _bthe V detected with embodiment 1 _bvoltage direction phase absolute value of voltage equal and opposite in direction, the in the lump derivation of reference example 1 on the contrary, then have:

One, when N is even number, after step s 14, following method is adopted to calculate x:

As y ∈ [1, N/2]:

(1) if V _b<0, or V _b>0 and V _a>0, then utilize formula 2 to calculate x;

(2) if V _b>0 and V _a<0, then utilize formula 1 to calculate x.

As y ∈ (N/2, N):

(1) if V _a<0, or V _a>0 and V _b>0, then utilize formula 1 to calculate x;

(2) if V _a>0 and V _b<0, then utilize formula 2 to calculate x.

Two, when N is odd number, after step s 14, following method is adopted to calculate x:

When y ∈ [1, (N-1)/2]:

(1) if V _a=0 and V _b<0, then x=(N+1)/2;

(2) if V _a>0 and V _b=0, then x=y+ (N-1)/2;

(3) if V _b<0, or V _b>0 and V _a>0, then utilize formula 2 to calculate x;

(4) if V _b>0 and V _a<0, then utilize formula 1 to calculate x.

When y ∈ [(N+1)/2), N) time:

(1) if V _a=0 and V _b>0, then x=(N+1)/2;

(2) if V _a<0 and V _b=0, then x=y-(N-1)/2;

(3) if V _a<0, or V _a>0 and V _b>0, then utilize formula 1 to calculate x;

(4) if V _a>0 and V _b<0, then utilize formula 2 to calculate x.

Refer to Fig. 6, second embodiment of the invention provides a kind of recognition methods of battery micro-short circuit, comprising:

S21, provides described batteries in parallel connection group 100, wherein, and N > 1;

S22, one positive pole closed-loop shaped bonding conductor 220 and a negative pole closed-loop shaped bonding conductor 230 is set in described batteries in parallel connection group 100, this positive pole closed-loop shaped bonding conductor 220 all has one second tie point 221 with parallel branch 110 described in each, this positive pole closed-loop shaped bonding conductor 220 is electrically connected with the positive pole of described N number of battery cell 120 simultaneously by N number of described second tie point 221 and is formed a positive pole annular channels, this negative pole closed-loop shaped bonding conductor 230 all has one the 3rd tie point 231 with parallel branch 110 described in each, this negative pole closed-loop shaped bonding conductor 230 is connected with the negative electricity of described N number of battery cell 120 simultaneously by N number of described 3rd tie point 231 and is formed a negative pole annular channels,

S23, often between adjacent two described battery cells 120, a resistance 300 is all being set, resistance 300 described in each is all arranged on described positive pole closed-loop shaped bonding conductor 220 or on described negative pole closed-loop shaped bonding conductor 230, and described positive pole closed-loop shaped bonding conductor 220 and negative pole closed-loop shaped bonding conductor 230 are provided with described resistance 300, one first voltage check device 410 in parallel on a described resistance 300 on described positive pole closed-loop shaped bonding conductor 220, one second voltage check device 420 in parallel on one on negative pole closed-loop shaped bonding conductor 220 described resistance 300,

S24, in this batteries in parallel connection group 100 operational process, all has one from euqalizing current I in this positive pole closed-loop shaped bonding conductor 220 and this negative pole closed-loop shaped bonding conductor 230 _sflow through, resistance 300 described in each all have one with should from euqalizing current I _scorresponding to equalizing voltage V _s, detecting should from equalizing voltage V _s, and setting a voltage pre-set threshold value, described voltage pre-set threshold value is described from equalizing voltage V _smore than 3 times of absolute value;

S25, in this batteries in parallel connection group 100 operational process, the voltage V that described in Real-time Collection, the first voltage check device 410 detects _awith the voltage V that described second voltage check device 420 detects _b, when V being detected _aand V _bin any one absolute value when being greater than described voltage pre-set threshold value, judge that this batteries in parallel connection group 100 there occurs micro-short circuit.

Second embodiment of the invention and first embodiment of the invention are substantially identical, its difference is mainly, two closed-loop shaped bonding conductors are provided with in described batteries in parallel connection group 100, these two closed-loop shaped bonding conductors are connected with the positive pole of described N number of battery cell 120 and negative electricity respectively, and two voltage check devices are separately positioned on these two closed-loop shaped bonding conductors.Described closed-loop shaped bonding conductor 210, positive pole closed-loop shaped bonding conductor 220 and negative pole closed-loop shaped bonding conductor 230 label are different but function is identical.In embodiments of the present invention, described closed-loop shaped bonding conductor 210, positive pole closed-loop shaped bonding conductor 220 and negative pole closed-loop shaped bonding conductor 230 to join end to end formation by a straight wire.

In step S23, as long as often arranging the resistance 300 that quantity is identical between adjacent two described battery cells 120, described N number of battery cell 120 can be made to be realized from balanced by described positive pole closed-loop shaped bonding conductor 220 and described negative pole closed-loop shaped bonding conductor 230.Be appreciated that, also a described resistance 300 can all be arranged on the described positive pole closed-loop shaped bonding conductor 220 often between adjacent two described battery cells 120 and described negative pole closed-loop shaped bonding conductor 230, but now notice that described first voltage check device 410 and described second voltage check device 420 need be connected in parallel between different adjacent two battery cells 120, to ensure when N is for odd number, there is micro-short circuit in any one battery cell 120, in described first voltage check device 410 and described second voltage check device 420, any one can detect described short-circuit voltage.

Determining after this batteries in parallel connection group 100 there occurs micro-short circuit, also can judge which battery cell 120 there occurs micro-short circuit further.Compared with the embodiment 1 in first embodiment of the invention, when N, y, x are all known, the V detected of second embodiment of the invention _athe V detected with first embodiment of the invention embodiment 1 _avoltage direction is all equal with absolute value of voltage size, the V detected of second embodiment of the invention _bthe V detected with first embodiment of the invention embodiment 1 _bvoltage direction phase absolute value of voltage equal and opposite in direction, the in the lump derivation of reference example 1 on the contrary, then have:

One, when N is even number, with reference to first embodiment of the invention embodiment 1, can derive:

1. when y ∈ [1, N/2) time:

(1) if x is ∈ [1, y], then V _a>0, V _b>0, and

\frac{V_{A}}{V_{B}} = \frac{2 x - N - 1}{1 + 2 y - N - 2 x}

Formula 3

(2) if x ∈ (y, N/2], then V _a>0, V _b<0, and

\frac{V_{A}}{V_{B}} = \frac{2 x - N - 1}{1 + 2 y + N - 2 x}

Formula 4

(3) if x ∈ (N/2, y+N/2], then V _a<0, V _b<0, and

\frac{V_{A}}{V_{B}} = \frac{2 x - N - 1}{1 + 2 y + N - 2 x}

Formula 4

(4) if x ∈ (y+N/2, N], then V _a<0, V _b>0, and

\frac{V_{A}}{V_{B}} = \frac{2 x - N - 1}{1 + 2 y + N - 2 x}

Formula 4

2. as y ∈ (N/2, N):

(1) if x is ∈ [1, y-N/2], then V _a>0, V _b<0, and

\frac{V_{A}}{V_{B}} = \frac{2 x - N - 1}{1 + 2 y - N - 2 x}

Formula 3

(2) if x ∈ (y-N/2, N/2], then V _a>0, V _b>0, and

\frac{V_{A}}{V_{B}} = \frac{2 x - N - 1}{1 + 2 y - N - 2 x}

Formula 3

(3) if x ∈ (N/2, y], then V _a<0, V _b>0, and

\frac{V_{A}}{V_{B}} = \frac{2 x - N - 1}{1 + 2 y - N - 2 x}

Formula 3

(4) if x ∈ (y, N], then V _a<0, V _b<0, and

\frac{V_{A}}{V_{B}} = \frac{2 x - N - 1}{1 + 2 y + N - 2 x}

Formula 4

3. as y=N/2:

(1) if x is ∈ [1, N/2], then V _a>0, V _b>0, and

\frac{V_{A}}{V_{B}} = \frac{2 x - N - 1}{1 + 2 y - N - 2 x}

Formula 3

(2) if x is ∈ [N/2, N], then V _a<0, V _b<0, and

\frac{V_{A}}{V_{B}} = \frac{2 x - N - 1}{1 + 2 y + N - 2 x}

Formula 4

After step s 14, following method is adopted to calculate x:

As y ∈ [1, N/2]:

(1) if V _b<0, or V _b>0 and V _a<0, then utilize formula 4 to calculate x;

(2) if V _b>0 and V _a>0, then utilize formula 3 to calculate x.

As y ∈ (N/2, N):

(1) if V _a>0, or V _a<0 and V _b>0, then utilize formula 3 to calculate x;

(2) if V _a<0 and V _b<0, then utilize formula 4 to calculate x.

When y ∈ [1, (N-1)/2]:

(1) if V _a=0 and V _b<0, then x=(N+1)/2;

(2) if V _a<0 and V _b=0, then x=y+ (N-1)/2;

(3) if V _b<0, or V _b>0 and V _a<0, then utilize formula 4 to calculate x;

(4) if V _b>0 and V _a>0, then utilize formula 3 to calculate x.

When y ∈ [(N+1)/2), N) time:

(1) if V _a=0 and V _b>0, then x=(N+1)/2;

(2) if V _a>0 and V _b=0, then x=y-(N-1)/2;

(3) if V _a>0, or V _a<0 and V _b>0, then utilize formula 4 to calculate x;

(4) if V _a<0 and V _b<0, then utilize formula 3 to calculate x.

Refer to Fig. 7, third embodiment of the invention provides a kind of recognition methods of battery micro-short circuit, comprising:

S31, provides described batteries in parallel connection group 100, and wherein, N is even number;

S32, arranges described closed-loop shaped bonding conductor 210 in described batteries in parallel connection group 100;

S33, the closed-loop shaped bonding conductor 210 often between adjacent two described battery cells 120 all arranges a resistance 300, a voltage check device 400 in parallel on resistance 300 described in any one;

S34, in this batteries in parallel connection group 100 operational process, has one from euqalizing current I in this closed-loop shaped bonding conductor 210 _spass through, resistance 300 described in each all have one with should from euqalizing current I _scorresponding to equalizing voltage V _s, detecting should from equalizing voltage V _s, and setting a voltage pre-set threshold value, described voltage pre-set threshold value is described from equalizing voltage V _smore than 3 times of absolute value;

S35, in this batteries in parallel connection group 100 operational process, the voltage that described in Real-time Collection, voltage check device 400 detects, when the absolute value of the voltage that this voltage check device 400 detects is greater than described voltage pre-set threshold value, judges that this batteries in parallel connection group 100 there occurs micro-short circuit.

Third embodiment of the invention is substantially identical with the first embodiment, its difference is, the quantity of described battery cell 120 is even number, therefore, only need on a described resistance 300 voltage check device in parallel, there occurs micro-short circuit regardless of battery cell 120 described in which, this voltage check device all can detect much larger than described from equalizing voltage V _sshort-circuit voltage.Described voltage check device 400, first voltage check device 410 and the second voltage check device 420 label are different but function is identical, all for measuring voltage direction on described resistance 300 and voltage swing

Refer to Fig. 8, fourth embodiment of the invention provides a kind of recognition methods of battery micro-short circuit, comprising:

S41, provides described batteries in parallel connection group 100, wherein, and N > 1;

S42, one non-enclosed bonding conductor 240 is set in described batteries in parallel connection group 100, this non-enclosed bonding conductor 240 all has one the 4th tie point 241 with parallel branch 110 described in each, and this closed-loop shaped bonding conductor 210 is electrically connected with the negative or positive electrode of described N number of battery cell 120 by N number of described 4th tie point 241 simultaneously;

S43, the described non-enclosed bonding conductor 240 often between adjacent two described battery cells 120 all arranges a resistance 300, a voltage check device 400 in parallel on any one resistance 300;

S44, in this batteries in parallel connection group 100 operational process, has one from euqalizing current I in this non-enclosed bonding conductor 240 _spass through, resistance 300 described in each all have one with should from euqalizing current I _scorresponding to equalizing voltage V _s, detecting should from equalizing voltage V _s, and setting a voltage pre-set threshold value, described voltage pre-set threshold value is described from equalizing voltage V _smore than 3 times of absolute value;

S45, in this batteries in parallel connection group 100 operational process, the voltage that described in Real-time Collection, voltage check device 400 detects, when the absolute value of the voltage that this voltage check device 400 detects is greater than described voltage pre-set threshold value, judges that this batteries in parallel connection group 100 there occurs micro-short circuit.

Fourth embodiment of the invention is substantially identical with the first embodiment, its difference is, described bonding conductor is non-enclosed but not closed-loop shaped, and only a voltage check device 400 need be set on a described resistance 300, there occurs micro-short circuit regardless of battery cell 120 described in which, this voltage check device all can detect much larger than described from equalizing voltage I _sshort-circuit voltage.This non-enclosed bonding conductor 240 can be the conductor with uniform resistance.In embodiments of the present invention, this non-enclosed bonding conductor 240 is a straight wire.

Refer to Fig. 9, fifth embodiment of the invention provides a kind of recognition methods of battery micro-short circuit, comprising:

S51, one electric battery 500 in parallel is provided, this batteries in parallel connection group 500 comprises N number of parallel branch 510, described cathode output end 130 and described cathode output end 140, described N number of parallel branch 510 is all by described cathode output end 130 and cathode output end 140 outwards output current, parallel branch 510 described in each includes M the battery cell 120 be connected in series, wherein, N > 1, M > 1;

S52, the battery cell 120 being positioned at same row in described N number of parallel branch 510 is formed one group, form M battery cell group 520, battery cell group 520 described in each includes N number of described battery cell 120, M+1 closed-loop shaped bonding conductor 210 is set in described batteries in parallel connection group 500, described closed-loop shaped bonding conductor 210 is arranged alternately with described battery cell group 520, described in each, closed-loop shaped bonding conductor 210 all has one first tie point 211 with parallel branch 510 described in each, this closed-loop shaped bonding conductor 210 is electrically connected with the negative or positive electrode of N number of battery cell 120 described in a described battery cell group by N number of described first tie point 211 simultaneously,

S53, for closed-loop shaped bonding conductor 210 described in each, is often all arranging a resistance 300 between adjacent two described first tie points 211, difference one first voltage check device 410 and one second voltage check device 420 in parallel on any two resistance 300;

S54, in this batteries in parallel connection group 500 operational process, all has one from euqalizing current I in closed-loop shaped bonding conductor 210 described in each _sflow through, resistance 300 described in each all have one with should from euqalizing current I _scorresponding to equalizing voltage V _s, detecting should from equalizing voltage V _s, and setting a voltage pre-set threshold value, described voltage pre-set threshold value is described from equalizing voltage V _smore than 3 times of absolute value;

S55, in this batteries in parallel connection group 500 operational process, the voltage V that Real-time Collection first voltage check device 510 described in each detects _awith the voltage V that the second voltage check device 520 described in each detects _b, when detecting in adjacent two described closed-loop shaped bonding conductors 210, the V of closed-loop shaped bonding conductor 210 described in each _aand V _bin any one absolute value when being all greater than described voltage pre-set threshold value, judge that two described closed-loop shaped bonding conductors 210 adjacent with this are electrically connected described battery cell group 520 simultaneously and there occurs micro-short circuit.

In step s 51, described batteries in parallel connection group 500 is substantially identical with described batteries in parallel connection group 100, and its difference is, parallel branch 510 described in each of described batteries in parallel connection group 500 is provided with M the battery cell 120 be connected in series.

In step S52, the present invention is numbered described M battery cell group 520 successively according to the order be connected in series, be respectively No. 1, No. 2 No. M-1, M battery cell group, according to same order, described M+1 closed-loop shaped bonding conductor 210 is numbered, is respectively No. 1, No. 2 No. M, M+1 closed-loop shaped bonding conductor.

For battery cell group 520 described in each, this battery cell group 520 is electrically connected with adjacent two described closed-loop shaped bonding conductors 210 simultaneously, such as shown in Fig. 9 No. 2 battery cell group, the positive pole of described N number of battery cell 120 is electrically connected with No. 2 closed-loop shaped bonding conductors simultaneously, and the negative pole of described N number of battery cell 120 is electrically connected with No. 3 closed-loop shaped bonding conductors simultaneously.Adjacent two described battery cell groups 520 share a closed-loop shaped bonding conductor 210, such as shown in Fig. 9 No. 2 closed-loop shaped bonding conductor, these No. 2 closed-loop shaped bonding conductors are connected with the negative electricity of N number of battery cell 120 of No. 1 battery cell group simultaneously, are electrically connected again with the positive pole of N number of battery cell 120 of No. 2 battery cell groups simultaneously.

For battery cell group 520 described in each, refer to the first embodiment and the second embodiment, when in this battery cell group 520 there is micro-short circuit in any one battery cell 120, short-circuit current is all had to pass through in two the closed-loop shaped bonding conductors 210 be electrically connected with this battery cell group 520 respectively, in these two closed-loop shaped bonding conductors 210, two voltage check devices that closed-loop shaped bonding conductor 210 described in each is arranged must have one can detect much larger than described from equalizing voltage V _sshort-circuit voltage.Such as when shown in Fig. 9 No. 2 battery cell group generation micro-short circuit, being arranged in the first voltage check device 410 on No. 2 closed-loop shaped bonding conductors and the second voltage check device 420 to have a described short-circuit voltage can be detected, and being arranged on must have one equally in the first voltage check device 410 on No. 3 closed-loop shaped bonding conductors and the second voltage check device 420 and described short-circuit voltage can be detected.Therefore, when short-circuit voltage all being detected in adjacent two closed-loop shaped bonding conductors 210, can judge that the battery cell group 520 that two closed-loop shaped bonding conductors 210 adjacent with this are electrically connected simultaneously there occurs micro-short circuit.

After determining which battery cell group 520 and micro-short circuit occur, also can judge in this battery cell group 520, which battery cell 120 there occurs micro-short circuit further, concrete decision method refers to first embodiment of the invention and the second embodiment, does not repeat them here.

Sixth embodiment of the invention provides a kind of recognition methods of battery micro-short circuit, comprising:

S61, provides described batteries in parallel connection group 500, and wherein, N is even number, M > 1;

S62, the battery cell 120 being positioned at same row in described N number of parallel branch 510 is formed one group, form M battery cell group 520, battery cell group 520 described in each includes N number of described battery cell 120, M+1 closed-loop shaped bonding conductor 210 is set in described batteries in parallel connection group 500, described closed-loop shaped bonding conductor 210 is arranged alternately with described battery cell group 520, described in each, closed-loop shaped bonding conductor 210 all has one first tie point 211 with parallel branch 510 described in each, this closed-loop shaped bonding conductor 210 is electrically connected with the negative or positive electrode of N number of battery cell 120 described in a described battery cell group by N number of described first tie point 211 simultaneously,

S63, for closed-loop shaped bonding conductor 210 described in each, is often all arranging a resistance 300 between adjacent two described first tie points 211, a voltage check device 400 in parallel on resistance 300 described in any one;

S64, in this batteries in parallel connection group 500 operational process, all has one from euqalizing current I in closed-loop shaped bonding conductor 210 described in each _sflow through, resistance 300 described in each all have one with should from euqalizing current I _scorresponding to equalizing voltage V _s, detecting should from equalizing voltage V _s, and setting a voltage pre-set threshold value, described voltage pre-set threshold value is described from equalizing voltage V _smore than 3 times of absolute value;

S65, in this batteries in parallel connection group 500 operational process, the voltage that Real-time Collection voltage check device 400 described in each detects, when the absolute value of voltage that the voltage check device 400 in adjacent two described closed-loop shaped bonding conductors 210 detects all is greater than described voltage pre-set threshold value, judges that two described closed-loop shaped bonding conductors 210 adjacent with this are electrically connected described battery cell group 520 simultaneously and there occurs micro-short circuit.

Sixth embodiment of the invention is substantially identical with the 5th embodiment, and difference is, described battery cell group 520 has even number battery cell 120.Because each battery cell group 520 includes even number battery cell 120, therefore only a voltage check device need be set on each closed-loop shaped bonding conductor 210, can judge whether described battery cell group 520 there occurs micro-short circuit.

When two voltage check devices 400 that adjacent two closed-loop shaped bonding conductors 210 are arranged are separately positioned between different parallel branches 510, after determining which battery cell group 520 and micro-short circuit occur, also can judge in this battery cell group 520, which battery cell 120 there occurs micro-short circuit further, concrete decision method refers to second embodiment of the invention, does not repeat them here.

The present invention first arranges the bonding conductor had from proportionality action in batteries in parallel connection group to the 6th embodiment, and have at this resistance and voltage check device are set in the bonding conductor of proportionality action, this resistance have one with this batteries in parallel connection group from euqalizing current corresponding from equalizing voltage, by comparing this voltage check device voltage detected and the size of being somebody's turn to do from equalizing voltage, just can identify this batteries in parallel connection group and whether there occurs micro-short circuit.The present invention also provides a kind of method judging which battery cell generation micro-short circuit in this batteries in parallel connection group further.The recognition methods of battery micro-short circuit provided by the invention has key effect for the raising of the security using the product of batteries in parallel connection group.

In addition, those skilled in the art can also do other changes in spirit of the present invention, and these changes done according to the present invention's spirit all should be included in the present invention's scope required for protection.

Claims

1. a recognition methods for battery micro-short circuit, comprising:

2. the recognition methods of battery micro-short circuit as claimed in claim 1, it is characterized in that, on described closed-loop shaped bonding conductor, with described first voltage check device for starting point, successively described N number of battery cell is numbered according to clock-wise order, be numbered 1 respectively, 2N-1, N battery cell, described second voltage check device is arranged between No. y and (y+1) number battery cell, y ∈ [1, and specify that the clockwise direction of described parallel circuit is current reference direction N).

3. the recognition methods of battery micro-short circuit as claimed in claim 2, it is characterized in that, described closed-loop shaped bonding conductor is electrically connected with the positive pole of described N number of battery cell simultaneously, the battery cell that micro-short circuit occurs in setting is x battery cell, after determining this batteries in parallel connection group generation micro-short circuit, following method is adopted to judge the numbering of described generation micro-short circuit battery cell further:

(1) when N is even number, time y ∈ [1, N/2]:

If V _b>0, or V _b<0 and V _a<0, then utilize calculate x;

If V _b<0 and V _a>0, then utilize calculate x;

(2) when N is odd number, during y ∈ (N/2, N):

If V _a>0, or V _a<0 and V _b<0, then utilize calculate x;

If V _a<0 and V _b>0, then utilize calculate x;

(3) when N is odd number, time y ∈ [1, (N-1)/2]:

If V _a=0 and V _b>0, then x=(N+1)/2;

If V _a<0 and V _b=0, then x=y+ (N-1)/2;

If V _b>0, or V _b<0 and V _a<0, then utilize calculate x;

If V _b<0 and V _a>0, then utilize calculate x;

(4) when N is odd number, y ∈ [(N+1)/2), N) time:

If V _a=0 and V _b<0, then x=(N+1)/2;

If V _a>0 and V _b=0, then x=y-(N-1)/2;

If V _a>0, or V _a<0 and V _b<0, then utilize calculate x;

If V _a<0 and V _b>0, then utilize calculate x.

4. the recognition methods of battery micro-short circuit as claimed in claim 2, it is characterized in that, described closed-loop shaped bonding conductor is connected with the negative electricity of described N number of battery cell simultaneously, the battery cell that micro-short circuit occurs in setting is x battery cell, after determining batteries in parallel connection group generation micro-short circuit described in this, following method is adopted to judge the numbering of described generation micro-short circuit battery cell further:

(1) when N is even number, time y ∈ [1, N/2]:

If V _b<0, or V _b>0 and V _a>0, then utilize calculate x;

If V _b>0 and V _a<0, then utilize calculate x;

(2) when N is odd number, during y ∈ (N/2, N):

If V _a<0, or V _a>0 and V _b>0, then utilize calculate x;

If V _a>0 and V _b<0, then utilize calculate x;

(3) when N is odd number, time y ∈ [1, (N-1)/2]:

If V _a=0 and V _b<0, then x=(N+1)/2;

If V _a>0 and V _b=0, then x=y+ (N-1)/2;

If V _b<0, or V _b>0 and V _a>0, then utilize calculate x;

If V _b>0 and V _a<0, then utilize calculate x;

(4) when N is odd number, y ∈ [(N+1)/2), N) time:

If V _a=0 and V _b>0, then x=(N+1)/2;

If V _a<0 and V _b=0, then x=y-(N-1)/2;

If V _a<0, or V _a>0 and V _b>0, then utilize calculate x;

If V _a>0 and V _b<0, then utilize calculate x.

5. the recognition methods of battery micro-short circuit as claimed in claim 2, it is characterized in that, two described closed-loop shaped bonding conductors are set in described batteries in parallel connection group, a described closed-loop shaped bonding conductor is electrically connected with the positive pole of described N number of battery cell simultaneously, and closed-loop shaped bonding conductor described in another is connected with the negative electricity of described N number of battery cell simultaneously; These two closed-loop shaped bonding conductors are provided with described resistance, and often between adjacent two described battery cells, described resistance arranges in these two closed-loop shaped bonding conductors; The battery cell that micro-short circuit occurs in setting is x battery cell, after determining this batteries in parallel connection group generation micro-short circuit, adopts following method to judge the numbering of described generation micro-short circuit battery cell further:

(1) when N is even number, time y ∈ [1, N/2]:

If V _b<0, or V _b>0 and V _a<0, then utilize calculate x;

If V _b>0 and V _a>0, then utilize calculate x;

(2) when N is odd number, during y ∈ (N/2, N):

If V _a>0, or V _a<0 and V _b>0, then utilize calculate x;

If V _a<0 and V _b<0, then utilize calculate x;

(3) when N is odd number, time y ∈ [1, (N-1)/2]:

If V _a=0 and V _b<0, then x=(N+1)/2;

If V _a<0 and V _b=0, then x=y+ (N-1)/2;

If V _b<0, or V _b>0 and V _a<0, then utilize calculate x;

If V _b>0 and V _a>0, then utilize calculate x;

(4) when N is odd number, y ∈ [(N+1)/2), N) time:

If V _a=0 and V _b>0, then x=(N+1)/2;

If V _a>0 and V _b=0, then x=y-(N-1)/2;

If V _a>0, or V _a<0 and V _b>0, then utilize calculate x;

If V _a<0 and V _b<0, then utilize calculate x.

6. the recognition methods of battery micro-short circuit as claimed in claim 1, it is characterized in that, described closed-loop shaped bonding conductor is the conductor with uniform resistance, and the resistance of described resistance is all identical.

7. a recognition methods for battery micro-short circuit, comprising:

8. a recognition methods for battery micro-short circuit, comprising:

S3, the described non-enclosed bonding conductor often between adjacent two described battery cells all arranges a resistance, resistor in parallel one voltage check device described in any one;

9. a recognition methods for battery micro-short circuit, comprising:

10. a recognition methods for battery micro-short circuit, comprising: