Detection circuit for an insulation resistance and battery

Abstract

Detection circuit for an insulation resistance, characterized in that it comprises a balanced bridge circuit, an adjustment circuit, a scanning resistor and an insulation resistor, wherein The balanced bridge circuit comprises several resistors, is arranged between a positive and a negative busbar, and serves to form a balanced bridge together with the insulation resistance; The adjustment circuit comprises several resistors and several switches, is arranged between the positive and negative busbars, and is configured so that, together with the balanced bridge circuit, it forms an unbalanced bridge circuit by controlling the switching state of the several switches; The scanning resistor is connected at one end to the negative busbar and at the other end to the positive busbar via the balanced bridge circuit and the adjustment circuit; and The insulation resistance is located between the positive and negative busbars.

Description

TECHNICAL AREA

[0001] The present application relates to the technical field of insulation resistance detection, and in particular to a detection circuit for an insulation resistance and a battery. BACKGROUND TECHNOLOGY

[0002] Against the backdrop of increasing fossil fuel scarcity, wind energy, photovoltaics, and hydropower offer unparalleled advantages over traditional coal-fired power plants in optimizing grid structure, saving energy and reducing emissions, combating the greenhouse effect, and ensuring national energy security, and have therefore attracted considerable attention from various quarters. With the increasing development of wind energy, photovoltaics, and hydropower, the impacts on the grid during connection and the risks arising from adjustments to the grid structure have become increasingly apparent. To address these shortcomings and enhance the advantages, the battery storage industry has developed accordingly. Lithium-ion battery storage can both mitigate the impact on the grid during connection and optimize the grid structure through peak load coverage and trough filling.With the rapid development of the lithium-ion battery industry, lithium-ion battery storage is increasingly used in grid-to-grid matching applications between wind power, photovoltaics, hydropower, and traditional grids, and the amount of stored energy is constantly increasing. As the amount of stored energy increases, so does the voltage level of the lithium-ion battery array. In this case, a deterioration of the insulation performance can cause incalculable property damage and personal injury. To avoid such problems, ground insulation monitoring of high-voltage energy storage lithium-ion battery arrays is crucial and must not be neglected.

[0003] Existing insulation measurement methods can be broadly divided into AC and DC methods. The AC method is based on AC signal injection, while the DC method is based on bridge balancing principles. First, the AC injection method is unsuitable for use in the energy storage industry. Injecting AC signals into the DC busbars has a certain impact on the battery itself and is absorbed by the capacitive load in the energy storage system, leading to a decrease in measurement accuracy. It would also cause unnecessary ripple noise at the end of the power consumption range. Second, the hierarchical structure of the bridge balancing method is simple. As in Fig. As shown in Figure 1, two resistors with known resistance values ​​R1 and R2 are connected in series between the positive and negative grounds of the busbars of a DC system. By measuring the voltage V1 across both ends of resistor R1, and in combination with the known busbar voltage VDC and the resistance values ​​of the known resistors R1 and R2, the insulation resistance can be calculated, which facilitates software-based measurement. However, if a positive and a negative ground short circuit occur simultaneously, and the positive and negative ground resistances decrease uniformly, the bridge balancing method cannot measure accurately, and there is a risk of an excessively large error. REVELATION OF THE INVENTION

[0004] The main objective of the present application is to provide a detection circuit for an insulation resistance and a battery in order to solve the problems of the prior art that insulation detection using the AC method is not suitable for use in the energy storage industry and insulation detection using the DC method cannot measure accurately and can result in an excessively large error.

[0005] According to one aspect of the present application, a detection circuit for an insulation resistance is provided, comprising a balanced bridge circuit, a tuning circuit, a sampling resistor, and an insulation resistor, wherein the balanced bridge circuit comprises several resistors and is arranged between a positive and a negative busbar; the tuning circuit comprises several resistors and several switches, is arranged between the positive and the negative busbar, and is configured to form an unbalanced bridge circuit together with the balanced bridge circuit by controlling the switching state of the several switches; the sampling resistor is connected at one end to the negative busbar and at the other end to the balanced bridge circuit and the tuning circuit; and the insulation resistor is arranged between the positive and the negative busbar.

[0006] Optionally, the setting circuit includes a first resistor, a second resistor, a first switch, and a second switch, wherein the first resistor is connected at one end to the positive busbar and at the other end to the first switch; the first switch is connected at an end remote from the first resistor to the second switch; the second switch is connected at an end remote from the first switch to the second resistor; and the second resistor is connected at an end remote from the second switch to the sampling resistor.

[0007] Optionally, the balanced bridge circuit includes a third resistor and a fourth resistor, wherein the third resistor is connected at one end to the positive busbar and at the other end is connected to the first switch, the second switch and the fourth resistor respectively; and the fourth resistor is connected at an end remote from the third resistor to the second resistor and the sampling resistor respectively.

[0008] Optionally, the balanced bridge circuit further includes a third switch, wherein the third switch is connected at one end to the first switch, the second switch, the third resistor and the fourth resistor, and is grounded at the other end.

[0009] Optionally, the insulation resistor comprises a first insulation resistor and a second insulation resistor, wherein the first insulation resistor is connected at one end to the positive busbar, at the other end to both the third switch and the second insulation resistor, and is grounded at that end; and the second insulation resistor is connected at an end remote from the first insulation resistor to the negative busbar.

[0010] Optionally, the scanning resistor is connected to the negative busbar at an end far from the second and fourth resistors.

[0011] According to another aspect of the present application, the present application further provides a battery comprising a detection circuit for an insulation resistance according to one of the above-mentioned embodiments.

[0012] The present application proposes an insulation detection circuit based on a "balanced bridge - unbalanced bridge" configuration, which offers the advantages of a narrow sampling voltage range and high accuracy compared to existing insulation detection circuits. This solution uses only one voltage sampling circuit to avoid the impact of errors between multiple voltage sampling circuits on the calculation accuracy. Additionally, the solution enables the simultaneous detection of the DC busbar voltage, thus saving the equipment costs of dedicated busbar voltage detection circuits. It can also be used as a supplement to other busbar voltage detection circuits as a detection method in the event of a failure of the insulation detection circuit due to a fault. DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein serve to further understand the present application and form part of the present application. The schematic embodiments of the present application and their description serve to illustrate the present application and do not constitute an inadmissible limitation of the present application. The drawings show: Fig. Figure 1 is a schematic diagram for insulation detection based on the bridge balancing method; Fig. Figure 2 is a system block diagram of a detection circuit for an insulation resistance according to an embodiment of the present application; Fig. Figure 3 is a schematic diagram of a detection circuit for an insulation resistance according to an embodiment of the present application; Fig. Figure 4 is a functional principle diagram for measuring the voltage Vn at both ends of the sampling resistor R5 in Fig. 3; Fig. Figure 5 is a functional principle diagram for measuring the voltage Vm at both ends of the sampling resistor R5 in Fig. 3; Fig. Figure 6 is a functional principle diagram for measuring the voltage Vx at both ends of the sampling resistor R5 in Fig. 3; and Fig. Figure 7 is a functional principle diagram for measuring the voltage Vy at both ends of the sampling resistor R5 in Fig. 3. DETAILED DESIGNS

[0014] It should be noted that the embodiments and features of the embodiments in this application can be combined with one another, provided no conflicts arise. The present application is explained in detail below with reference to drawings and embodiments.

[0015] It should be noted that the terms used here serve only to describe specific embodiments and not to limit the exemplary embodiments according to the present application. As used here, the singular form is intended to include the plural form unless expressly stated otherwise in the context. Furthermore, it should be understood that the terms "comprise" and / or "include," when used in this description, indicate the presence of features, steps, operations, parts, components, and / or combinations thereof.

[0016] Unless expressly stated otherwise, the relative arrangements, numerical expressions, and values ​​of the components and steps described in these exemplary embodiments do not limit the scope of this application. It is understood that the dimensions of the individual parts in the accompanying drawings are not shown to scale for the sake of clarity. Techniques, methods, and devices known to a person skilled in the art in the relevant field may not be explained in detail but should be considered part of the description of the invention under appropriate circumstances. In all the examples shown and discussed herein, each specific value is to be understood merely as an example and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.It should be noted that similar symbols and letters in the following drawings denote similar elements, so that an element defined in one drawing does not need to be further explained in subsequent drawings.

[0017] Fig. Figure 2 is a system block diagram of a detection circuit for an insulation resistance according to an embodiment of the present application. As in Fig. As shown in Figure 2, the detection circuit for an insulation resistance comprises a balanced bridge circuit 20, an adjustment circuit 22, a scanning resistor 24 and an insulation resistor 26, wherein the balanced bridge circuit 20 comprises several resistors and is arranged between a positive and a negative busbar; the setting circuit 22 comprises several resistors and several switches, is arranged between the positive and the negative busbar, and is set up so that, together with the balanced bridge circuit 20, it forms an unbalanced bridge circuit by controlling the switching state of the several switches; The scanning resistor 24 is connected at one end to the negative busbar and at the other end to the balanced bridge circuit 20 and the setting circuit 22; and The insulation resistance 26 is arranged between the positive and negative busbars and the earth.

[0018] Fig. Figure 3 is a schematic diagram of a detection circuit for an insulation resistance according to an embodiment of the present application. As in Fig. As shown in Figure 3, a balanced bridge (i.e., the above-mentioned balanced bridge circuit 20) is formed by inserting resistors R3 and R4 between the positive and negative busbars.

[0019] The high-voltage switches K1 and K2 are each closed and switched on to switch on R1 and R2 (i.e. the above-mentioned setting circuit 22) and form an unbalanced bridge so that the resistance values ​​of the insulation resistances Rx and Ry are each calculated.

[0020] The R5 in Fig. 3 is the aforementioned scanning resistor 24.

[0021] According to an optional embodiment of the present application, the setting circuit 22 comprises a first resistor, a second resistor, a first switch and a second switch, wherein the first resistor is connected at one end to the positive busbar and at the other end to the first switch; the first switch is connected at an end remote from the first resistor to the second switch; the second switch is connected at an end remote from the first switch to the second resistor; the second resistor is connected at an end remote from the second switch to the scanning resistor.

[0022] As in Fig. Figure 3 shows the first resistor, the second resistor, the first switch and the second switch, which comprise the setting circuit 22, as R1, R2, K1 and K2 respectively. Fig. 3, and it can be made from Fig. Figure 3 shows that R1 is connected at one end to the positive busbar and at the other end to K1. K1 is connected at one end furthest from R1 to K2, K2 is connected at the other end to R2, and R2 is connected at the other end to the scanning resistor R5. K1 and K2 are used to switch on the resistors in order to interrupt the balanced bridge.

[0023] According to an optional embodiment of the present application, the balanced bridge circuit 20 comprises a third resistor and a fourth resistor, wherein the third resistor is connected at one end to the positive busbar and at the other end is connected to the first switch, the second switch and the fourth resistor respectively; the fourth resistor is connected at an end remote from the third resistor to the second resistor and the scanning resistor respectively.

[0024] As in Fig. As shown in Figure 3, the third and fourth resistors comprising the balanced bridge circuit 20 are R3 and R4 respectively. Fig. 3, and it can be made from Fig. As can be seen in section 3, R3 is connected to the positive busbar at one end and to K1, K2, and R4 at the other end. R4 is connected to R2 and R5 at the end furthest from R3.

[0025] As an optional embodiment of the present application, the balanced bridge circuit 20 further comprises a third switch, wherein the third switch is connected at one end to the first switch, the second switch, the third resistor and the fourth resistor, and is grounded at the other end.

[0026] As in Fig. As shown in 3, the third switch K3 mentioned above is in Fig. 3, where K3 is connected at one end to K1, K2, R3 and R4 respectively, and grounded at the other end. K3 serves to introduce the ground to form the balanced bridge.

[0027] In some optional embodiments of the present application, the insulation resistor 26 comprises a first insulation resistor and a second insulation resistor, wherein the first insulation resistor is connected at one end to the positive busbar, at the other end to the third switch and the second insulation resistor respectively, and is grounded at this end; the second insulation resistor is connected at an end remote from the first insulation resistor to the negative busbar.

[0028] As in Fig. Figure 3 shows the first insulation resistance and the second insulation resistance, which comprise the insulation resistance 26, respectively, as Rx and Ry. Fig. 3, and it can be made from Fig. As can be seen in Figure 3, Rx is connected to the positive bus bar at one end and to K3, Ry, and PE at the other end. Ry is connected to the negative bus bar at an end furthest from Rx.

[0029] In some other optional embodiments of the present application, the scanning resistor 24 is connected to the negative busbar at an end remote from the second resistor and the fourth resistor.

[0030] As mentioned above, the scanning resistor R5 is connected at one end to R2 and R4 and at the other end to the negative busbar.

[0031] The insulation resistance detection circuit proposed in this application can ensure the accuracy of the measurement of the insulation resistance value between the positive and negative DC busbars and earth. Simultaneously, it can measure the busbar voltage between the positive and negative DC busbars, thus ensuring the normal operation of the high-voltage energy storage lithium battery pack under multiple safeguards. In particular, it can prevent damage to property and personal injury caused by insufficient insulation performance of the high-voltage lithium battery pack. Since the detection method offers the advantages of a wide detection voltage range and high accuracy, it can also be used in high-voltage DC applications such as photovoltaic inverters and new energy vehicles.

[0032] Based on the above-mentioned detection circuit for an insulation resistance, the embodiment of the present application also provides a method for insulation resistance detection, the operation of which is as follows: 1. Measurement of the total system voltage

[0033] As in Fig. As shown in Figure 4, the voltage Vn can be measured at both ends of the scanning resistor R5 when the high-voltage switches K1, K2 and K3 are open, so that Vn can be used to calculate the total system voltage Vdc, and the calculation formula is as follows: Vdc=Vn×(R3+R4+R5)R5

[0034] 2. As in Fig. As shown in Figure 5, the system sampling voltage Vm is measured when the high-voltage switches K1 and K2 are open and the high-voltage switch K3 is closed.

[0035] 3. As in Fig. As shown in Figure 6, the system sampling voltage Vx is measured when the high-voltage switch K2 is open and the high-voltage switches K1 and K3 are closed.

[0036] 4. As in Fig. As shown in Figure 7, the system sampling voltage Vy is measured when the high-voltage switch K1 is open and the high-voltage switches K2 and K3 are closed.

[0037] 5. After comparing the magnitudes of Vm and Vn, the formulas for calculating the resistance values ​​of Rx and Ry respectively are introduced, based on the following conditions.

[0038] 1) If Vm < Vn, the formula for calculating the insulation resistances Rx and Ry is as follows: Rx=R1×Vn×(2×R1+R5)×(Vm−Vx)2×R1×Vn×Vx−2×R5×Vn×Vm−4×R1×Vn×Vm+R5×Vn×Vx+R1×Vm×Vx+R5×Vm×Vx Ry=R1×Vn×(Vm−Vx)×(2×R12+3×R1×R5+R52)4R12×Vn2+R52×Vn2+4×R1×R5×Vn2−R52×Vn×Vm−4×R12×Vn×Vx−R52×Vn×Vx+R12×Vm×Vx+R52× Vm×Vx−2×R1×R5×Vn×Vm−4×R1×R5×Vn×Vx+2×R1×R5×Vm×Vx

[0039] 2) If Vm > Vn, the formula for calculating the insulation resistances Rx and Ry is as follows: Rx=R13×Vm×Vy2×R12×Vn×Vy−2×R52×Vn×Vm−4×R12×Vn×Vm+2×R52×Vn×Vy+R12×Vm×Vy−6×R1×R5×Vn×Vm+5×R1×R5×Vn×Vy −2×R1×Vn×Vm−2×R1×Vn×Vy2×Vn×Vm−2×Vn×Vy Ry=Vn×(2×R1+R5)×(R1×Vy−2×R5×Vm−2×R1×Vm+2×R5×Vy)4×R1×Vn×Vm+2×R5×Vn×Vm−4×R1×Vn×Vy−2×R5×Vn×Vy+R1×Vm×Vy

[0040] In the embodiments of the present application, the resistance values ​​of resistors R1, R2, R3, R4 and the sampling resistor R5 on the "balanced bridge - unbalanced bridge" can be adjusted according to the sampling range of the sampling circuit. The resistance values ​​of resistors R1, R2, R3, R4 and R5 can also be adjusted according to the accuracy and range of the sampling circuit and the sampling chip to match the sampling circuit.

[0041] The following section explains the detection circuit for an insulation resistance proposed in the present application by means of specific embodiments.

[0042] This insulation monitoring concept was implemented in a battery management system (BMS) for lithium batteries to improve the accuracy and reliability of insulation performance measurements in high-voltage lithium battery systems. The problem of deteriorating insulation performance due to insulation aging was correctly assessed, and appropriate warnings were issued, thus preventing a number of safety incidents. Simultaneously, the BMS system eliminates the need for DC bus voltage sampling circuits, thereby reducing associated material costs. Furthermore, this offers advantages such as clearer logic in software processing, facilitating adaptation and modification.

[0043] In an optional embodiment, Rx=35000 (KΩ), Ry=600 (KΩ) is the artificially introduced insulation resistance for the test and VDC=800 (V) is the total voltage of the battery system to be tested. Component parameters:R1=R2=R3=R4=3000(KΩ) R5=10(KΩ)

[0044] The specific calculation steps are as follows: 1. When the high-voltage switches K1, K2, K3 are open, the voltage across both ends of the scanning resistor R5 is read and denoted as Vn=1.3311V and inserted into the formula to calculate the total system voltage Vdc. Vdc=601∗Vn=799.9911(V) due to the scanning accuracy Vdc=799.9911≈VDC=800(V) The total system voltage determined by the calculation essentially corresponds to the actual total system voltage, and the error accuracy <±0.5% meets the application requirements. 2. When the high-voltage switches K1, K2 are open and the high-voltage switch K3 is closed, the voltage at both ends of the scanning resistor R5 is read and denoted as Vm=0.4074V. 3. The magnitudes of Vn and Vm are assessed. If Vn > Vm, then step 4 is executed; if Vn < Vm, then step 5 is executed.

[0045] In this embodiment, V n = 1.3311> V m =0.4074, therefore step 4 is executed.

[0046] 4. If Vn > Vm, then the high-voltage switch K2 is opened, the high-voltage switches K1 and K3 are closed, the voltage at both ends of the sampling resistor R5 is read and denoted as Vx and inserted into the formula to calculate the positive earth insulation resistance Rx and the negative earth insulation resistance Ry: Rx=18030000×Vn×(Vm−Vx)6010×Vn×Vx−12020×Vn×Vm+3010×Vm×Vx Ry=−54270300000×Vn×(Vm−Vx)36120100×Vn2−60100×Vn×Vm−36120100×Vn×Vx+9060100×Vm×Vx

[0047] Solution: Rx = 35160 (kΩ) Ry = 600197 (kΩ). Due to sampling accuracy issues, there is an error between the calculated insulation resistance and the actual insulation resistance. Comparative testing confirmed that the error accuracy is < ±0.5% and therefore meets the application requirements.

[0048] 5. If Vn < Vm, then the high-voltage switch K1 is opened, the high-voltage switches K2 and K3 are closed, the voltage at both ends of the sampling resistor R5 is read and denoted as Vy and inserted into the formula to calculate the positive earth insulation resistance Rx and the negative earth insulation resistance Ry (this step was omitted due to the judgment in step 3). Rx=1803000×Vn×(151×Vy−301×Vm)90751×Vn×Vy−180901×Vn×Vm+45000×Vm×Vy Ry=6010×Vn×(3020×Vy−6020×Vm)12020×Vn×Vm−12020×Vn×Vy+3000×Vm×Vy

[0049] 6. The calculated positive earth insulation resistance Rx and the negative earth insulation resistance Ry are compared with the specified system values ​​to assess whether an insulation anomaly is present. If an insulation anomaly occurs, appropriate alarm actions are initiated.

[0050] The embodiments of the present application also provide a battery that includes the aforementioned insulation resistance detection circuit. Therefore, this battery incorporates all the technical effects of the aforementioned insulation resistance detection circuit. Since the technical effects of the insulation resistance detection circuit have already been described in detail above, they will not be discussed further here.

[0051] To simplify the description, spatial relative terms such as "above...", "above...", "on the surface of...", "above", etc., can be used to describe the spatial positional relationship of a component or feature to other components or features as shown in the drawings. It is important to understand that spatial relative terms are intended to encompass orientations other than the one described in the drawings when the component is used or operated. For example, if the component is reversed in the drawings, the component described as "above other components or structures" or "on top of other components or structures" will then be positioned as "below other components or structures" or "under other components or structures". Therefore, the exemplary term "above..." can refer to both the orientation "above..."This includes both the orientation "below..." and the orientation "below...". The component can also be positioned in various other ways (rotated 90 degrees or in other orientations), and a corresponding interpretation of the spatial reference terms used here will be made.

[0052] Furthermore, it should be noted that the use of terms such as "first," "second," etc., to designate components serves solely to distinguish the respective components. Unless otherwise stated, the aforementioned terms have no special meaning and are therefore not to be understood as limiting the scope of protection of this application.

[0053] The foregoing statements merely represent preferred embodiments of the present application and are not intended to limit this application. Various amendments and variations of the present application are possible for those skilled in the art. All changes, equivalent replacements, improvements, etc., made in the sense and within the scope of the present application shall fall within the scope of protection of the present application.

Claims

[1] Detection circuit for an insulation resistance, characterized in that it comprises a balanced bridge circuit, a tuning circuit, a sampling resistor and an insulation resistor, wherein The balanced bridge circuit comprises several resistors, is arranged between a positive and a negative busbar, and serves to form a balanced bridge together with the insulation resistance; The adjustment circuit comprises several resistors and several switches, is arranged between the positive and negative busbars, and is configured so that, together with the balanced bridge circuit, it forms an unbalanced bridge circuit by controlling the switching state of the several switches; The scanning resistor is connected at one end to the negative busbar and at the other end to the positive busbar via the balanced bridge circuit and the adjustment circuit; and The insulation resistance is located between the positive and negative busbars. [2] Detection circuit for an insulation resistance according to claim 1, characterized in that the setting circuit comprises a first resistor, a second resistor, a first switch and a second switch, wherein the first resistor is connected to the positive busbar at one end and to the first switch at the other end; the first switch is connected to the second switch at an end furthest from the first resistor; the second switch is connected to the second resistor at an end furthest from the first switch; and the second resistor is connected to the scanning resistor at an end furthest from the second switch. [3] Detection circuit for an insulation resistance according to claim 1, characterized in that the setting circuit comprises a first resistor, a second resistor, a first switch and a second switch, wherein the first switch is connected to the positive busbar at one end and to the first resistor at the other end; the first resistor is connected to the second switch at an end furthest from the first switch; the second switch is connected to the second resistor at an end furthest from the first switch; and the second resistor is connected to the scanning resistor at an end furthest from the second switch. [4] Detection circuit for an insulation resistance according to claim 1, characterized in that the setting circuit comprises a first resistor, a second resistor, a first switch and a second switch, wherein the first resistor is connected to the positive busbar at one end and to the first switch at the other end; the first switch is connected to the second resistor at an end furthest from the first resistor; the second resistor is connected to the second switch at an end furthest from the first switch; and the second switch is connected to the scanning resistor at an end furthest from the second resistor. [5] Detection circuit for an insulation resistance according to claim 1, characterized in that the setting circuit comprises a first resistor, a second resistor, a first switch and a second switch, wherein the first switch is connected to the positive busbar at one end and to the first resistor at the other end; the first resistor is connected to the second resistor at an end furthest from the first switch; the second resistor is connected to the second switch at an end furthest from the first resistor; and the second switch is connected to the scanning resistor at an end furthest from the second resistor. [6] Detection circuit for an insulation resistance according to one of claims 2 to 5, characterized in that the balanced bridge circuit comprises a third resistor and a fourth resistor, wherein the third resistor is connected at one end to the positive busbar and at the other end is connected to the first switch, the second switch and the fourth resistor respectively; and The fourth resistor is connected at an end furthest from the third resistor to the second resistor and the sampling resistor. [7] Detection circuit for an insulation resistance according to claim 6, characterized in that the balanced bridge circuit further comprises a third switch, wherein the third switch is connected at one end to the first switch, the second switch, the third resistor and the fourth resistor and is connected at the other end to the insulation resistance. [8] Detection circuit for an insulation resistance according to claim 7, characterized in that the insulation resistance comprises a first insulation resistance and a second insulation resistance, wherein the first insulation resistor is connected at one end to the positive busbar and at the other end is connected to the third switch, the second insulation resistor and earth, respectively; and the second insulation resistor is connected to the negative busbar at an end farther from the first insulation resistor. [9] Detection circuit for an insulation resistor according to claim 6, characterized in that the scanning resistor is connected to the negative busbar at an end remote from the second resistor and the fourth resistor. [10] Battery, characterized in that it comprises a detection circuit for an insulation resistance according to any one of claims 1 to 9.

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