Battery pack voltage sampling circuit determination method

Abstract

The invention provides a battery pack voltage sampling circuit determination method, and the method comprises the steps: obtaining parameters of a battery pack and the number of sampling channels of a sampling unit, the parameters comprising the number k of battery modules, the number p of equivalent cells in each battery module, the total number n of cells in the battery pack, n = k * p, and the number m of the sampling channels of the sampling unit, the equivalent battery cell is a battery cell assembly formed by connecting one or more battery cells in parallel; and if it is determined that cross-battery module sampling exists in the sampling units according to n, k, p and m and at least one sampling channel which can be used as a target sampling channel exists in the sampling units, determining the number of sampling units required in the battery pack voltage sampling circuit according to n, p and m. Therefore, the utilization rate of the sampling channels of the sampling units is improved, the use number of the sampling units is reduced as much as possible, and the cost is saved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and in particular to a method for determining a battery pack voltage sampling circuit. Background Art

[0002] The battery pack is usually composed of one or more battery modules connected in series and packaged. The battery module is formed by connecting multiple battery cells in series. The battery cells are connected by aluminum tabs, and the battery modules are connected by copper bars or aluminum bars. Usually, the internal resistance of each aluminum tab connecting all the battery cells is basically the same, but the internal resistance of the copper bar is usually much larger than that of the aluminum tab. Therefore, when detecting the battery cell voltage, the influence of the internal resistance of the aluminum tab on the collected battery cell voltage can be ignored. However, since the copper bar is connected between two battery modules, only the collected voltage of the last battery cell of the previous battery module in the two battery modules will be collected, so the influence of the copper bar on the sampled voltage of the battery cell cannot be ignored.

[0003] At present, the cell voltage is usually collected through sampling lines. One end of each sampling line is connected to the aluminum pick, and the other end is connected to the sampling channel of the sampling chip. Each sampling channel is connected to a sampling line. Since the number of sampling channels cannot correspond to the number of cells in each battery module, for example, the number of sampling channels is generally an even number, while the number of cells in the battery module is an odd number, in order to reduce costs during general use, the sampling chip is connected between two battery modules to perform cross-battery module sampling. However, the collected voltage of the last cell of the previous battery module in the two battery modules will be affected by the copper busbar, resulting in the sampled voltage being higher during charging and lower during discharge. As a result, the cell will be mistaken for a cell with poor performance, affecting the performance of the entire energy storage system. Summary of the invention

[0004] The present application provides a method for determining a battery pack voltage sampling circuit to solve the problems in the above-mentioned background technology.

[0005] In a first aspect, the present application provides a method for determining a battery pack voltage sampling circuit, wherein the battery pack includes at least one battery module, and the cells of each two adjacent battery modules are connected in series through a first connector, and the battery pack voltage sampling circuit is used to sample the voltage of each cell, and the battery pack voltage sampling circuit includes at least one sampling unit, and the sampling unit includes a plurality of sampling channels, and both ends of each cell are respectively connected to two sampling channels, and both ends of each first connector share a sampling channel with respective adjacent cells, and the plurality of sampling channels include at least one target sampling channel, and the target sampling channel is a sampling channel connected between the first connector and the target cell, and the target cell is the last cell in the previous battery module of the two adjacent battery modules connected by the first connector;

[0006] The method comprises:

[0007] Obtaining parameters of the battery pack and the number of sampling channels of the sampling unit, wherein the parameters include the number of battery modules as k, the number of equivalent cells in each battery module as p, the total number of cells in the battery pack as n, n=k*p, and the number of sampling channels of the sampling unit as m, wherein the equivalent cell is a cell assembly formed by connecting one or more cells in parallel;

[0008] If it is determined based on n, k, p, and m that the sampling unit has cross-battery module sampling and there is at least one sampling channel in the sampling unit that can be used as the target sampling channel, then the number of sampling units required in the battery pack voltage sampling circuit is determined based on n, p, and m.

[0009] Optionally, the determining, according to the n, k, p, and m, that the sampling unit has cross-battery module sampling and that there is at least one sampling channel in the sampling unit that can be used as the target sampling channel includes:

[0010] If k is greater than or equal to 2, then according to the size relationship between n and m-1 and the size relationship between m-1 and p, it is determined that the sampling unit has cross-battery module sampling and there is at least one sampling channel in the sampling unit that can be used as the target sampling channel, and m-1 is the number of battery cells that can be collected by the sampling unit when a sampling channel is set between every two adjacent battery cells.

[0011] Optionally, the determining, based on the size relationship between n and m-1 and the size relationship between m-1 and p, that the sampling unit has cross-battery module sampling and that there is at least one sampling channel in the sampling unit that can be used as the target sampling channel includes:

[0012] If n is less than m-1, it is determined that the sampling unit has cross-battery module sampling and there is at least one sampling channel in the sampling unit that can be used as the target sampling channel;

[0013] If n is greater than m-1 and m-1 is greater than p, it is determined that the sampling unit has cross-battery module sampling and there is at least one sampling channel in the sampling unit that can be used as the target sampling channel.

[0014] Optionally, determining the number of sampling units required in the battery pack voltage sampling circuit according to n, p and m includes:

[0015] If n is less than m-1, the number of sampling units required in the battery pack voltage sampling circuit is determined according to m, n, and k;

[0016] If n is greater than m-1, based on m and p, determine the number of battery modules sampled by the sampling unit to be h, where h is an integer obtained by rounding down the ratio of m to p; based on n, m, p, and h, determine the number of sampling units required in the battery pack voltage sampling circuit.

[0017] Optionally, determining the number of sampling units required in the battery pack voltage sampling circuit according to the n, m, p, and h includes:

[0018] According to m, p, h, get mp*h;

[0019] If the ratio of mp*h to h is greater than or equal to 1, the number of sampling units required in the battery pack voltage sampling circuit is determined based on n, m, and h.

[0020] Optionally, determining the number of sampling units required in the battery pack voltage sampling circuit according to the n, m, and h includes:

[0021] According to the n, m, h-1, obtain the ratio of n+1 to mh;

[0022] An integer obtained by rounding up the ratio of the n+1 to mh is determined as the number of sampling units.

[0023] Optionally, the method further comprises:

[0024] If the ratio of mp*h to h is less than 1, at least one of n, m, k, and p is adjusted;

[0025] The method for obtaining the parameters of the battery pack and the number of sampling channels of each sampling unit is m, including:

[0026] Get the parameters of the adjusted battery pack and the number of sampling channels of each sampling unit.

[0027] Optionally, the method further comprises:

[0028] If it is determined that there is no sampling channel in the sampling unit that can be used as the target sampling channel according to the size relationship between n and m-1 and the size relationship between m-1 and p, at least one of n, m, k, and p is adjusted;

[0029] The method for obtaining the parameters of the battery pack and the number of sampling channels of each sampling unit is m, including:

[0030] Get the parameters of the adjusted battery pack and the number of sampling channels of each sampling unit.

[0031] Optionally, determining the number of sampling units required in the battery pack voltage sampling circuit according to m, n, and k includes:

[0032] If m is greater than or equal to (n+1)+(k-1), it is determined that the number of sampling units required in the battery pack voltage sampling circuit is 1.

[0033] Optionally, the method further comprises:

[0034] If m is less than (n+1)+(k-1), at least one of n, m, k, and p is adjusted:

[0035] The method for obtaining the parameters of the battery pack and the number of sampling channels of each sampling unit is m, including:

[0036] Get the parameters of the adjusted battery pack and the number of sampling channels of each sampling unit.

[0037] In a second aspect, the present application provides a battery pack voltage sampling circuit determination device, the battery pack includes at least one battery module, the cells of each two adjacent battery modules are connected in series through a first connector, the battery pack voltage sampling circuit is used to sample the voltage of each cell, the battery pack voltage sampling circuit includes at least one sampling unit, the sampling unit includes a plurality of sampling channels, both ends of each cell are respectively connected to two sampling channels, and both ends of each first connector share a sampling channel with respective adjacent cells, the plurality of sampling channels include at least one target sampling channel, the target sampling channel is a sampling channel connected between the first connector and the target cell, the target cell is the last cell in the previous battery module of the two adjacent battery modules connected by the first connector;

[0038] The device comprises:

[0039] An acquisition module, used to acquire parameters of the battery pack and the number of sampling channels of the sampling unit, wherein the parameters include the number of battery modules as k, the number of equivalent cells in each battery module as p, the total number of cells in the battery pack as n, n=k*p, and the number of sampling channels of the sampling unit as m, wherein the equivalent cell is a cell assembly formed by connecting one or more cells in parallel;

[0040] A processing module is used to determine the number of sampling units required in the battery pack voltage sampling circuit according to n, p, and m if it is determined according to n, k, p, and m that the sampling unit has cross-battery module sampling and there is at least one sampling channel in the sampling unit that can be used as the target sampling channel.

[0041] In a third aspect, an embodiment of the present application provides an electronic device, including:

[0042] One or more processors;

[0043] A memory for storing one or more programs;

[0044] When one or more programs are executed by one or more processors, the one or more processors are enabled to execute the method for implementing the above-mentioned first aspect.

[0045] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium on which a computer program is stored, and the computer program is used to implement the method of the first aspect above.

[0046] In a fifth aspect, an embodiment of the present application provides a computer program product, including a computer program, which implements the method of the first aspect when executed by a processor.

[0047] The method for determining the battery pack voltage sampling circuit provided in the present application obtains the parameters of the battery pack and the number of sampling channels of the sampling unit, wherein the parameters include the number of battery modules as k, the number of equivalent cells in each battery module as p, the total number of cells in the battery pack as n, and the number of sampling channels of the sampling unit as m. If it is determined according to n, k, p, and m that the sampling unit has cross-battery module sampling and there is at least one sampling channel in the sampling unit that can be used as a target sampling channel, then according to n, p, and m, the number of sampling units required in the battery pack voltage sampling circuit is determined, so that even if the sampling unit in the battery pack voltage sampling circuit has cross-battery module sampling, as long as there is a sampling channel between each two adjacent cells in the sampling unit and at least one sampling channel is left unused, these unused sampling channels can be used as target sampling channels, so that the battery pack voltage sampling circuit can more accurately sample the voltages of the target cells and other cells. Therefore, the sampling unit meets the requirements of the battery pack voltage sampling circuit, so that the matching number of sampling units can be obtained, thereby improving the utilization rate of the sampling channels of the sampling unit, minimizing the number of sampling units used, and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0049] Figure 1 A structure for sampling the cell voltage during charging of an existing battery pack voltage sampling circuit provided in an embodiment of the present application;

[0050] Figure 2 A structure for sampling the cell voltage during discharge of an existing battery pack voltage sampling circuit provided in an embodiment of the present application;

[0051] Figure 3A schematic diagram of the structure of a battery pack voltage sampling circuit provided in one embodiment of the present application;

[0052] Figure 4 A flowchart of a method for determining a battery pack voltage sampling circuit provided in an embodiment of the present application;

[0053] Figure 5 A flowchart of a method for determining a battery pack voltage sampling circuit provided by another embodiment of the present application;

[0054] Figure 6 A block diagram of a battery pack voltage sampling circuit determination device provided in one embodiment of the present application;

[0055] Figure 7 It is a schematic diagram of the structure of an electronic device according to an embodiment of the present application.

[0056] In the figure: 1-battery module; 2-battery cell; 3-first connecting piece; 4-sampling unit; 5-sampling channel; 6-target sampling channel; 7-target battery cell. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also belong to the scope of protection of the present application. In addition, it should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other in the absence of conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0058] In the prior art, the energy storage components in the electrochemical energy storage system may include multiple levels, generally a battery module is formed by connecting multiple battery cells in series, and then one or more battery modules are connected in series and packaged into a battery pack. Multiple battery packs are further connected in series to form a battery cluster, and then multiple battery clusters are connected in parallel to obtain an energy storage battery array. Among them, the battery cells in the battery module are connected in series by aluminum tabs, and each battery module composed of multiple battery cells is connected by a copper bus. In an electrochemical energy storage system, the performance of the entire system is generally determined by the battery cell with the worst performance among all the battery cells connected in series and parallel, and after the electrochemical energy storage system has been used for a period of time, the performance of each battery cell will change, thereby affecting the performance of the entire electrochemical energy storage system.

[0059] Therefore, the voltage of each battery cell is usually monitored in real time. However, in reality, the aluminum strips connecting the battery cells and the copper busbars connecting the two battery modules have internal resistance. In the actual monitoring process of the battery cells, the internal resistance of the copper busbar connected between the two battery cells will affect the monitoring voltage result of the previous battery cell connected to the copper busbar, resulting in a large deviation between the monitoring result and the actual voltage of the battery cell. In addition, the internal resistance of the aluminum strips between the battery cells is basically the same, and the impact on the collected battery cell voltage is basically the same, while the copper busbars between the battery modules can be equivalently regarded as a series resistor between the two battery modules. The resistance of this resistor is much larger than the internal resistance of the aluminum strips between the battery cells, and has a greater impact on the voltage of the battery cells connected to the copper busbars in the two battery modules. Figure 1 and Figure 2 As shown in the figure, sampling point A is set at the end of the previous cell connected to the copper busbar away from the copper busbar, and sampling point B is set between the next cell connected to the copper busbar and the copper busbar, so that the voltage U at sampling point A is A and the voltage U at sampling point B B The voltage difference U AB As the voltage of the first of the two cells connected to the copper busbar.

[0060] like Figure 1 As shown in the figure, when the energy storage component is charged, the direction of the charging current flows from the positive electrode of the battery cell to the negative electrode. At this time, the voltage of the first battery cell of the two batteries connected to the copper busbar is U0, and the voltage of the copper busbar connected to it is U R , according to the voltage U at sampling point A A and the voltage U at sampling point B B Get U AB As the voltage of the first cell of the two cells connected to the copper busbar, its value is the voltage U0 of the cell and the voltage U R The sum of the collected cell voltage is U0+U R .

[0061] like Figure 2 As shown in the figure, when the energy storage component is discharging, the direction of the discharge current flows from the negative electrode of the battery cell to the positive electrode. At this time, the voltage of the first battery cell of the two batteries connected to the copper busbar is U0, and the voltage of the copper busbar connected to it is U R , according to the voltage U at sampling point A A and the voltage U at sampling point B B Get U AB As the voltage of the first cell of the two cells connected to the copper busbar, its value is the voltage U0 of the cell and the voltage U R The difference between the two, that is, the voltage of the collected battery cell is U0-U R .

[0062] According to the above content, when sampling the voltage, the collected voltage of the battery cell is greater than the actual voltage of the battery cell during charging, which causes the electrochemical energy storage system to think that the battery cell has been charged to the threshold value and ends charging in advance. When discharging, the collected voltage of the battery cell is less than the actual voltage of the battery cell, which causes the electrochemical energy storage system to think that the electric energy stored in the battery cell has been discharged, thereby ending the discharge in advance, so that the collected voltage value is not the true voltage value of the battery cell, that is, it is too high when charging and too low when discharging, which will cause the battery cell to be mistaken for the battery cell with the worst performance, affecting the performance of the entire energy storage system. Therefore, it is necessary to accurately collect the voltage of the battery cell, which is the target battery cell 7 mentioned below in this application.

[0063] The present application provides a battery pack voltage sampling circuit to solve the above problems, and the specific solution is as follows.

[0064] Figure 3 A battery pack voltage sampling circuit is shown according to an embodiment of the present application. Figure 3 As shown, the battery pack includes at least one battery module 1, and the battery cells 2 of each two adjacent battery modules 1 are connected in series through a first connector 3. The battery pack voltage sampling circuit is used to sample the voltage of each battery cell 2. The battery pack voltage sampling circuit includes at least one sampling unit 4. The sampling unit 4 includes multiple sampling channels 5. Both ends of each battery cell 2 are respectively connected to two sampling channels 5, and both ends of each first connector 3 share the sampling channels 5 with the respective adjacent battery cells 2. The multiple sampling channels 5 include at least one target sampling channel 6. The target sampling channel 6 is a sampling channel 5 connected between the first connector 3 and a target battery cell 7. The target battery cell 7 is the last battery cell 2 in the previous battery module 1 of the two adjacent battery modules 1 connected by the first connector 3.

[0065] A sampling channel 5 is connected to both ends of each battery cell 2, wherein one end of the target battery cell 7 (i.e., between the target battery cell 7 and the battery cell 2 connected in series with it in the same battery module 1) is connected to a sampling channel 5, and the voltage collected by this sampling channel 5 is U1; the other end of the target battery cell 7 (i.e., between the target battery cell 7 and the first battery cell 2 connected in series with it through the first connector 3 in the next battery module 1) is connected to a sampling channel 5, and the sampling channel 5 is close to the first battery cell 2 of the next battery module 1, and is used to collect the voltage U2 at the connection between the first connector 3 and the first battery cell 2. In the present application, a sampling channel 5 is also connected between the target battery cell 7 and the first connector 3, and the sampling channel 5 is close to the target battery cell 7, and is used to collect the voltage U3 at the connection between the target battery cell 7 and the first connector 3. The sampling channel 5 is called the target sampling channel 6. Compared with the prior art that determines the voltage of the target battery cell 7 based on U1 and U2, the present application determines the voltage of the target battery cell 7 based on U1 and U3, and U3 is closer to the actual voltage value of the other end of the target battery cell 7 than U2.

[0066] In addition, the voltage of other battery cells 2 is obtained based on the voltage collected by the sampling channel 5 connected to one end of the battery cell 2 and the voltage collected by the sampling channel 5 connected to the other end of the battery cell 2 .

[0067] The battery pack voltage sampling circuit of the present application sets a sampling point between the target battery cell 7 and the first connector 3, the sampling point is close to the target battery cell 7, and a sampling channel 5 is connected to the sampling point as the target sampling channel 6, so as to accurately collect the voltage of the target battery cell 7. The sampling channel 5 can collect voltage through a sampling line and a voltage sensor.

[0068] The sampling unit 4 may be a sampling chip in hardware implementation, for example, and the sampling chip may be integrated into a battery module management unit (full name: Battery Management Unit, abbreviated in English: BMU).

[0069] On the basis of the structure of the above-mentioned battery pack voltage sampling circuit, when determining a battery pack voltage sampling circuit, it is necessary to determine the number of sampling units 4 required to be used.

[0070] When the sampling unit 4 samples the battery cells 2 in the battery module 1, and the number of sampling channels 5 required by the battery module 1 is less than the number of sampling channels 5 of the sampling unit 4, the sampling channels 5 of one sampling unit 4 can sample all the battery cells 2 in the current battery module 1. In the absence of sampling across the battery module 1, the current sampling unit 4 still has remaining sampling channels 5.

[0071] When the number of sampling channels 5 required by a battery module 1 is greater than the number of sampling channels 5 of a sampling unit 4, multiple sampling units 4 are required to collect the voltages of all battery cells 2 in a battery module 1. However, if the number of sampling channels 5 of the multiple sampling units 4 used is greater than the number of sampling channels 5 required by a battery module 1, there will be remaining sampling channels 5 in the absence of sampling across the battery module 1.

[0072] In actual application, in order to save costs and reduce the remaining sampling channels 5 , sampling is usually performed across battery modules 1 to reduce the number of sampling units 4 .

[0073] Therefore, based on the above analysis, determining the appropriate number of sampling units 4 while minimizing the economic cost is one of the issues that this application focuses on solving, and the specific solution is as follows.

[0074] Figure 4 A battery pack voltage sampling circuit determination method is shown according to an embodiment of the present application. Figure 4 As shown, the method comprises the following steps:

[0075] S1. Obtain the parameters of the battery pack and the number of sampling channels of the sampling unit. The parameters include the number of battery modules (k), the number of equivalent cells in each battery module (p), the total number of cells in the battery pack (n), n=k*p, and the number of sampling channels of the sampling unit (m), where an equivalent cell is a cell assembly formed by connecting one or more cells in parallel.

[0076] Among them, the parameters of the battery pack are determined according to the battery specifications, that is, the number of battery modules k, the number of equivalent cells in each battery module p, and the total number of cells in the battery pack n are all known quantities. One possible implementation of the sampling unit is a sampling chip. When the type of the sampling chip is determined, the number of its sampling channels is a fixed value, that is, a known quantity.

[0077] S2. If it is determined based on n, k, p, and m that the sampling unit has cross-battery module sampling and there is at least one sampling channel in the sampling unit that can be used as a target sampling channel, then the number of sampling units required in the battery pack voltage sampling circuit is determined based on n, p, and m.

[0078] In this embodiment, after obtaining the above-mentioned n, k, p, and m, it is determined whether the sampling unit has cross-battery module sampling based on n, k, p, and m; if it is determined based on n, k, p, and m that the sampling unit does not have cross-battery module sampling, it means that the sampling channel of a sampling unit can independently collect the voltages of all battery cells in a battery module, then the current sampling unit is determined as an optional sampling unit under the condition of satisfying the parameters of the current battery pack, and this scheme can be used as an alternative scheme.

[0079] If it is determined based on n, k, p, and m that the sampling unit has cross-battery module sampling, then it is determined based on n, k, p, and m whether there is at least one sampling channel in the sampling unit that can be used as a target sampling channel; if it is determined based on n, k, p, and m that there is at least one sampling channel in the sampling unit that can be used as a target sampling channel, it means that there is a sampling channel set between every two adjacent battery cells in the sampling unit and at least one sampling channel remains unused. These sampling channels can be used as target sampling channels, and the number of sampling channels m of the sampling unit meets the requirements of the battery pack voltage sampling circuit of this application. Then this application determines the number of sampling units required in the battery pack sampling circuit based on n, p, and m.

[0080] If it is determined based on n, k, p, and m that the sampling unit has cross-battery module sampling, but there is not at least one sampling channel that can be used as the target sampling channel, it means that the number of sampling channels m of the sampling unit does not meet the requirements of the battery pack voltage sampling circuit of this application, and at least one of n, k, p, and m needs to be updated, such as redesigning the total number of battery cells in the battery pack, redesigning the number of battery modules in the battery pack, redesigning the number of equivalent battery cells in the battery module, reselecting sampling units with different numbers of sampling channels, etc., and then re-executing the above S1.

[0081] In this embodiment, by obtaining the parameters of the battery pack and the number of sampling channels of the sampling unit, the parameters include the number of battery modules k, the number of equivalent cells in each battery module p, the total number of cells in the battery pack n, and the number of sampling channels of the sampling unit m. If it is determined according to n, k, p, and m that the sampling unit has cross-battery module sampling and there is at least one sampling channel in the sampling unit that can be used as a target sampling channel, then according to n, p, and m, the number of sampling units required in the battery pack voltage sampling circuit is determined. Therefore, even if the sampling unit in the battery pack voltage sampling circuit has cross-battery module sampling, as long as there is a sampling channel between each two adjacent cells in the sampling unit and at least one sampling channel is left unused, these unused sampling channels can be used as target sampling channels, so that the battery pack voltage sampling circuit can more accurately sample the voltages of the target cells and other cells. Therefore, the sampling unit meets the requirements of the battery pack voltage sampling circuit, so that the matching number of sampling units can be obtained, thereby improving the utilization rate of the sampling channels of the sampling unit, minimizing the number of sampling units used, and saving costs.

[0082] Optionally, determining in S2 according to the n, k, p, and m that the sampling unit has cross-battery module sampling and that there is at least one sampling channel in the sampling unit that can be used as the target sampling channel can be implemented by the following step S21:

[0083] S21, if k is greater than or equal to 2, then according to the size relationship between n and m-1 and the size relationship between m-1 and p, it is determined that the sampling unit has cross-battery module sampling and there is at least one sampling channel in the sampling unit that can be used as a target sampling channel, and m-1 is the number of battery cells that can be collected by the sampling unit when a sampling channel is set between every two adjacent battery cells.

[0084] Determine whether the number of battery modules k is less than 2. If the number of battery modules k is less than 2, that is, k is equal to 1, there is only one battery module in the battery pack, and there is no cross-battery module sampling. The number of sampling units can be determined based on the number of sampling channels p+1 required by the battery module and the number of sampling channels m of the sampling unit. This solution can be used as an alternative solution.

[0085] If the number of battery modules k is greater than or equal to 2, it means that there may be cross-battery module sampling. Then, based on the size relationship between n and m-1 and the size relationship between m-1 and p, it is determined whether the sampling unit has cross-battery module sampling and whether there is at least one sampling channel in the sampling unit that can be used as the target sampling channel.

[0086] Specifically, based on the size relationship between n and m-1, it can be determined whether the number of sampling channels of a sampling unit can meet the sampling channel number requirement for collecting all battery cells in a battery pack, and whether the sampling unit can collect all battery cells in a battery pack. Based on the size relationship between m-1 and p, it can be determined whether the number of sampling channels of a sampling unit can meet the sampling channel number requirement for collecting all battery cells in a battery module, and whether the sampling unit can collect all battery cells in a battery module, thereby determining whether the sampling unit has cross-battery module sampling and whether there is at least one sampling channel in the sampling unit that can be used as a target sampling channel.

[0087] Alternatively, see Figure 5 , S21 can be implemented by the following steps S211 and S212:

[0088] S211 , if n is less than m-1, it is determined that the sampling unit has cross-battery module sampling and there is at least one sampling channel in the sampling unit that can be used as a target sampling channel.

[0089] S212: If n is greater than m-1 and m-1 is greater than p, it is determined that the sampling unit has cross-battery module sampling and there is at least one sampling channel in the sampling unit that can be used as a target sampling channel.

[0090] Determine whether n is less than m-1. If n is less than m-1, it means that the number of sampling channels of a sampling unit can meet the number of sampling channels required for sampling all the cells in the battery pack. Then it is determined that the sampling unit has cross-battery module sampling, and the sampling channels in the sampling unit are arranged between every two adjacent cells in the battery pack, and there is at least one sampling channel remaining. These remaining sampling channels can be used as target sampling channels, so as to determine that there is at least one sampling channel in the sampling unit that can be used as a target sampling channel.

[0091] If n is equal to m-1, it means that the number of sampling channels of a sampling unit can meet the number of sampling channels required when a sampling channel is set between every two adjacent cells in the battery pack, and it is determined that the sampling unit has cross-battery module sampling. After a sampling channel is set between every two adjacent cells in the battery pack, there are no remaining sampling channels in the sampling unit, so it is determined that there is no at least one sampling channel in the sampling unit that can be used as a target sampling channel. In order to add a target sampling channel, another sampling unit will be added, but the number of sampling channels in the sampling unit is much greater than the required target sampling channel number k-1, which will cause a waste of sampling channels, and at least one of n, k, p, and m needs to be updated. Please refer to the records in the above embodiments for details, which will not be repeated here.

[0092] If n is greater than m-1, it means that the number of sampling channels of a sampling unit cannot meet the number of sampling channels required for collecting all the cells of the battery pack. In addition, determine whether m-1 is greater than p. If m-1 is greater than p, it means that the number of sampling channels of a sampling unit can meet the number of sampling channels required for collecting all the cells of a battery module. In addition, p is also equal to the number of sampling channels required when a battery module is provided with a sampling channel between every two adjacent cells, which means that after a sampling channel is provided between every two adjacent cells of a battery module, at least two sampling channels remain in the sampling unit. These remaining sampling channels can be used as target sampling channels for at least two battery modules, thereby determining that there are at least two sampling channels in the sampling unit that can be used as target sampling channels. Since a battery module only needs one target sampling channel, the sampling unit has cross-battery module sampling.

[0093] If m-1 is equal to p, it means that the number of sampling channels of a sampling unit can meet the number of sampling channels required for collecting data from all cells in a battery module. In addition, it means that after a sampling channel is set between every two adjacent cells in a battery module, there is still one sampling channel left in the sampling unit. This sampling channel can be used as the target sampling channel of the battery module, thereby determining that there is a sampling channel in the sampling unit that can be used as the target sampling channel, but the sampling unit does not have cross-battery module sampling.

[0094] If m-1 is less than p, it means that the number of sampling channels of a sampling unit cannot meet the number of sampling channels required for collecting all the cells in the battery pack, and multiple sampling units are required to sample a battery module, which also means that there is no at least one sampling channel in the sampling unit that can be used as the target sampling channel. Since a battery module requires multiple sampling units to implement cell voltage sampling, the cost is relatively high, and at least one of n, k, p, and m needs to be updated. For details, please refer to the records in the above embodiment, which will not be repeated here.

[0095] Optionally, determining the number of sampling units required in the battery pack voltage sampling circuit according to n, p, and m in S2 can be implemented by the following steps S22-S24:

[0096] S22. If n is less than m-1, the number of sampling units required in the battery pack voltage sampling circuit is determined according to m, n, and k.

[0097] If n is less than m-1, it is necessary to determine whether the number of sampling channels of a sampling unit meets the number of sampling channels required for this application to collect the voltages of all battery cells in the battery pack. It is also necessary to refer to the number of battery modules k in the battery pack, and then determine the number of sampling units required in the battery pack voltage sampling circuit based on m, n, and k.

[0098] Alternatively, see Figure 5 , S22 can be achieved through S221:

[0099] S221. If m is greater than or equal to (n+1)+(k-1), it is determined that the number of sampling units required in the battery pack voltage sampling circuit is 1.

[0100] Determine whether m is less than (n+1)+(k-1), where n+1 represents the number of sampling channels required to collect the voltages of all cells in the battery pack according to the provision of a sampling channel between every two adjacent cells in the battery pack, and k-1 represents the number of target cells in the battery pack, and also represents the target number of sampling channels required for the battery pack, wherein two sampling channels (including one target sampling channel) are provided between each target cell and the first cell of the next battery module. (n+1)+(k-1) represents the number of sampling channels required for the present application to collect the voltages of all cells in the battery pack. If m is greater than or equal to (n+1)+(k-1), it means that one sampling unit can meet the sampling channel number requirement of the battery pack in the present application, thereby determining that the number of sampling units required in the battery pack voltage sampling circuit is 1.

[0101] Optionally, if m is less than (n+1)+(k-1), it means that the number of sampling channels remaining in a sampling unit after a sampling channel is set between every two adjacent cells in the battery pack is insufficient to meet the demand for (k-1) target sampling channels. In order to add target sampling channels, another sampling unit will be added, but the number of sampling channels in the sampling unit is much greater than the required number of target sampling channels k-1, which will cause a waste of sampling channels. In this case, at least one of n, k, p, and m needs to be updated. For details, please refer to the records in the above embodiments, which will not be repeated here.

[0102] S23. If n is greater than m-1, the number of battery modules sampled by the sampling unit is determined to be h according to m and p, where h is an integer obtained by rounding down the ratio of m to p.

[0103] S24. Determine the number of sampling units required in the battery pack voltage sampling circuit according to n, m, p, and h.

[0104] In this embodiment, if n is greater than m-1, it means that multiple sampling units are needed to collect the voltages of all cells in the battery pack, and the number of sampling units can be realized by S23 and S24. Specifically, firstly, according to m and p, the number of battery modules sampled by the sampling unit is determined to be h.

[0105] Since the number of sampling channels of the sampling unit is not necessarily an integer multiple of the number of equivalent cells in the battery module, that is, the ratio of m to p may not be an integer, under the premise that a sampling unit can completely collect the voltages of all cells in the battery module, it can be determined that the number of battery modules that can be completely collected by a sampling unit is the integer obtained by rounding down the ratio of m to p, that is, h. Then, the number of sampling units required in the battery pack voltage sampling circuit is determined based on n, m, p, and h.

[0106] Alternatively, see Figure 5 , S24 can be implemented by the following steps S241 and S242:

[0107] S241. Obtain mp*h according to m, p, and h.

[0108] Among them, one sampling unit can fully collect the cell voltages of h battery modules. There are p equivalent cells in a battery module, so p*h is the number of equivalent cells in h battery modules, which also means the number of sampling channels required when one sampling channel is set between every two adjacent cells in h battery modules. mp*h is the number of sampling channels remaining after one sampling unit sets one sampling channel between every two adjacent cells in h battery modules.

[0109] S242: If the ratio of mp*h to h is greater than or equal to 1, the number of sampling units required in the battery pack voltage sampling circuit is determined based on n, m, and h.

[0110] After obtaining mp*h, obtain the ratio of mp*h to h, where h also represents the target number of sampling channels required for the above-mentioned h battery modules. If the ratio of mp*h to h is greater than or equal to 1, it means that after a sampling unit is provided with a sampling channel between every two adjacent battery cells in the h battery modules, the number of remaining sampling channels is greater than or equal to the target number of sampling channels required for the above-mentioned h battery modules. Then, the number of sampling units required in the battery pack voltage sampling circuit is determined based on n, m, and h.

[0111] Optionally, if the ratio of mp*h to h is less than 1, it means that after a sampling unit sets a sampling channel between every two adjacent battery cells in h battery modules, the number of remaining sampling channels is less than the target number of sampling channels required for the above h battery modules, then at least one of n, k, p, and m needs to be updated. For details, please refer to the records in the above embodiments and will not be repeated here.

[0112] Optional, see Figure 5 In S242, the number of sampling units required in the battery pack voltage sampling circuit can be determined according to n, m, and h by steps S2421 and S2422:

[0113] S2421. Obtain a ratio of n+1 to mh according to the n, m, and h;

[0114] S2422. The integer obtained by rounding up the ratio of n+1 to mh is determined as the number of sampling units.

[0115] In this embodiment, mh represents the number of sampling channels of a sampling unit in addition to h target sampling channels when fully sampling h battery modules, and n+1 represents the number of sampling channels required according to the provision of a sampling channel between every two adjacent cells in the battery pack; in order to determine the number of sampling units required for the battery pack, the ratio of n+1 to mh is obtained, and the number of sampling units can be obtained by the ratio. If the ratio of n+1 to mh is a positive integer, the ratio is determined as the number of sampling units, and if the ratio of n+1 to mh is not an integer, the integer obtained by rounding up the ratio is determined as the number of sampling units.

[0116] The following is an example of the scheme of this application:

[0117] When n=m-1, for example: n=4, m=5, that is, m-1=4.

[0118] If k=1, since there is only one battery module in the battery pack, there is no first connector, that is, the sampling unit does not sample across battery modules. Then, according to the number of sampling channels n+1=5 required by the battery pack and the number of sampling channels m=5 of the sampling unit, it can be determined that one sampling unit can meet the battery cell voltage sampling requirements of the battery pack. Therefore, the number of sampling units is determined to be 1, and there are no remaining sampling channels.

[0119] If k = 2, it indicates that there is one first connection member in the battery pack, which means that the sampling unit performs cross-battery-module sampling, and the required number of target sampling channels in the battery pack is k - 1 = 1. The required number of sampling channels for the battery pack is (n + 1)+(k - 1)=6. Therefore, two sampling units are needed to meet the cell voltage sampling requirements of this battery pack. Thus, the number of sampling units is determined to be 2. However, in this case, there will be a situation where 4 sampling channels are left unused.

[0120] When n < m - 1, for example: n = 4, m = 6, that is, m - 1 = 5.

[0121] If k = 4, that is, m < (n + 1)+(k - 1), it is determined that the sampling unit performs cross-battery-module sampling, and the required number of target sampling channels in the battery pack is k - 1 = 3. The required number of sampling channels for the battery pack is (n + 1)+(k - 1)=8. Therefore, two sampling units are needed to meet the cell voltage sampling requirements of this battery pack. Thus, the number of sampling units is determined to be 2. However, in this case, there will be a situation where 4 sampling channels are left unused.

[0122] If k = 2, that is, m = (n + 1)+(k - 1), it is determined that the sampling unit performs cross-battery-module sampling, and the required number of target sampling channels in the battery pack is k - 1 = 1. The required number of sampling channels for the battery pack is (n + 1)+(k - 1)=6. Therefore, one sampling unit is needed to meet the cell voltage sampling requirements of this battery pack. Thus, the number of sampling units is determined to be 1. Moreover, in this case, there is no situation where sampling channels are left unused.

[0123] If k = 1, that is, m > (n + 1)+(k - 1), it is determined that the sampling unit does not perform cross-battery-module sampling, and the required number of sampling channels for the battery pack is n + 1 = 5. Therefore, one sampling unit is needed to meet the cell voltage sampling requirements of this battery pack. Thus, the number of sampling units is determined to be 1. Moreover, in this case, there is a situation where one sampling channel is left unused.

[0124] When n > m - 1, for example, n = 6, m = 4, m - 1 = 3.

[0125] If k = 3, correspondingly p = 2, that is, m - 1 > p, it is determined that the sampling unit performs cross-battery-module sampling, and the required number of target sampling channels in the battery pack is k - 1 = 2. The required number of sampling channels for the battery pack is (n + 1)+(k - 1)=9. Therefore, three sampling units are needed to meet the cell voltage sampling requirements of this battery pack. Thus, the number of sampling units is determined to be 3. However, in this case, there will be a situation where 3 sampling channels are left unused.

[0126] If k = 2, correspondingly p = 3, that is, m - 1 = p, it is determined that there is no cross-battery-module sampling for the sampling unit, and the number of target sampling channels required in the battery pack is k - 1 = 1. The number of sampling channels required for the battery pack is (n + 1)+(k - 1)=8. Therefore, 2 sampling units are needed to meet the cell voltage sampling requirements of this battery pack. Therefore, the number of sampling units is determined to be 2, and in this case, there is no situation of remaining sampling channels.

[0127] If k = 1, correspondingly p = 6, that is, m - 1 < p, it is determined that there is no cross-battery-module sampling for the sampling unit. The number of sampling channels required for the battery pack is n + 1 = 7. Therefore, 2 sampling units are needed to meet the cell voltage sampling requirements of this battery pack. Therefore, the number of sampling units is determined to be 2, and in this case, there is a situation of one remaining sampling channel.

[0128] It should be noted that generally, it is considered that the resources are maximally utilized and the economy is better when there is no remaining sampling channel. If there is a situation of remaining sampling channels, the number of sampling units can be re-determined by changing at least one of m, n, k, and p, and try to make there be no remaining sampling channels as much as possible. Among them, the value of m can be changed preferentially. In addition, if it is difficult to avoid the situation of remaining sampling channels, the economy of the battery pack voltage sampling circuit can be determined by determining the number of sampling units and the type of sampling unit, etc., and the number of sampling units can be determined from the scheme with the best economy.

[0129] Figure 6 It is a block diagram of a device for determining a battery pack voltage sampling circuit shown according to an embodiment of the present application. As Figure 6 shown, the device includes: an acquisition module 61 and a processing module 62. Optionally, the device further includes an adjustment module 63.

[0130] The acquisition module 61 is configured to acquire the parameters of the battery pack and the number of sampling channels of the sampling unit. The parameters include the number of battery modules as k, the number of equivalent cells in each battery module as p, the total number of cells in the battery pack as n, n = k * p, and the number of sampling channels of the sampling unit as m, where the equivalent cell is an aggregate of one or more cells connected in parallel;

[0131] The processing module 62 is configured to, if it is determined according to n, k, p, and m that the sampling unit has cross-battery-module sampling and there is at least one sampling channel in the sampling unit that can be used as a target sampling channel, determine the number of sampling units required in the battery pack voltage sampling circuit according to n, p, and m.

[0132] Optionally, the processing module 62 determines that the sampling unit has cross-battery-module sampling and there is at least one sampling channel in the sampling unit that can be used as a target sampling channel according to n, k, p, and m, specifically for:

[0133] If k is greater than or equal to 2, then based on the size relationship between n and m-1 and the size relationship between m-1 and p, it is determined that the sampling unit has cross-battery module sampling and there is at least one sampling channel in the sampling unit that can be used as the target sampling channel, and m-1 is the number of battery cells that can be collected by the sampling unit when a sampling channel is set between every two adjacent battery cells.

[0134] Optionally, the processing module 62 determines that the sampling unit has cross-battery module sampling and there is at least one sampling channel in the sampling unit that can be used as a target sampling channel according to the size relationship between n and m-1 and the size relationship between m-1 and p, specifically for:

[0135] If n is less than m-1, it is determined that the sampling unit has cross-battery module sampling and there is at least one sampling channel in the sampling unit that can be used as a target sampling channel;

[0136] If n is greater than m-1 and m-1 is greater than p, it is determined that the sampling unit has cross-battery module sampling and there is at least one sampling channel in the sampling unit that can be used as a target sampling channel.

[0137] Optionally, the processing module 62 determines the number of sampling units required in the battery pack voltage sampling circuit according to n, p and m, specifically for:

[0138] If n is less than m-1, the number of sampling units required in the battery pack voltage sampling circuit is determined according to m, n, and k;

[0139] If n is greater than m-1, based on m and p, the number of battery modules sampled by the sampling unit is determined to be h, where h is the integer obtained by rounding down the ratio of m to p; based on n, m, p, and h, the number of sampling units required in the battery pack voltage sampling circuit is determined.

[0140] Optionally, the processing module 62 determines the number of sampling units required in the battery pack voltage sampling circuit according to n, m, p, and h, specifically for:

[0141] According to m, p, h, get mp*h;

[0142] If the ratio of mp*h to h is greater than or equal to 1, the number of sampling units required in the battery pack voltage sampling circuit is determined based on n, m, and h.

[0143] Optionally, the processing module 62 determines the number of sampling units required in the battery pack voltage sampling circuit according to n, m, and h, specifically for:

[0144] According to the n, m, h-1, obtain the ratio of n+1 to mh;

[0145] An integer obtained by rounding up the ratio of n+1 to mh is determined as the number of sampling units.

[0146] Optionally, the adjustment module 63 is further configured to adjust at least one of n, m, k, and p if the ratio of mp*h to h is less than 1;

[0147] The acquisition module 61 is specifically used to acquire the adjusted parameters of the battery pack and the number of sampling channels of each sampling unit.

[0148] Optionally, the adjustment module 63 is further configured to adjust at least one of n, m, k, and p if it is determined that no sampling channel in the sampling unit can be used as the target sampling channel according to the size relationship between n and m-1 and the size relationship between m-1 and p;

[0149] The acquisition module 61 is specifically used for:

[0150] Get the parameters of the adjusted battery pack and the number of sampling channels of each sampling unit.

[0151] Optionally, the processing module 62 determines the number of sampling units required in the battery pack voltage sampling circuit according to m, n, and k, specifically for:

[0152] If m is greater than or equal to (n+1)+(k-1), it is determined that the number of sampling units required in the battery pack voltage sampling circuit is 1.

[0153] Optionally, the adjustment module 63 is further configured to adjust at least one of n, m, k, and p if m is less than (n+1)+(k-1);

[0154] The acquisition module 61 is specifically used for:

[0155] Get the parameters of the adjusted battery pack and the number of sampling channels of each sampling unit.

[0156] In addition, it should be noted that for the relevant contents in the device embodiment, please refer to the method embodiment and will not be repeated here.

[0157] Figure 7 This is a schematic diagram of the structure of an electronic device provided by an embodiment of the present application. Figure 7 As shown, the electronic device includes: a processor 71 and a memory 72.

[0158] The memory 72 stores computer-executable instructions.

[0159] The processor 71 executes the computer-executable instructions stored in the memory 72, so that the processor 71 executes the method described in any of the above embodiments.

[0160] The specific implementation process of the electronic device provided in the embodiment of the present application can be referred to the above method embodiment, and its implementation principle and technical effect are similar, so this embodiment will not be repeated here.

[0161] In the above Figure 7 In the illustrated embodiment, it should be understood that the processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc. The steps of the method disclosed in the invention may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0162] The memory may include a high-speed RAM memory, and may also include a non-volatile storage NVM, such as at least one disk storage.

[0163] The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the bus in the drawings of the present application is not limited to only one bus or one type of bus.

[0164] An embodiment of the present application also provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, the method shown in the above method embodiment is implemented.

[0165] The computer-readable storage medium mentioned above can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general or special-purpose computer.

[0166] An exemplary readable storage medium is coupled to a processor so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium can also exist in the device as discrete components.

[0167] Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, disk or optical disk and other media that can store program codes.

[0168] Finally, it should be noted that all contents not described in the technical solution of this application can be implemented using existing technologies. In addition, the above embodiments are only used to illustrate the technical solution of this application, rather than to limit it; although the application is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A method for determining a battery pack voltage sampling circuit, It is characterized in that The battery pack includes at least one battery module, the cells of each two adjacent battery modules are connected in series through a first connector, the battery pack voltage sampling circuit is used to sample the voltage of each cell, the battery pack voltage sampling circuit includes at least one sampling unit, the sampling unit includes a plurality of sampling channels, both ends of each cell are respectively connected to two sampling channels, and both ends of each first connector share a sampling channel with respective adjacent cells, the plurality of sampling channels include at least one target sampling channel, the target sampling channel is a sampling channel connected between the first connector and the target cell, and the target cell is the last cell in the previous battery module of the two adjacent battery modules connected by the first connector; The method comprises: Obtaining parameters of the battery pack and the number of sampling channels of the sampling unit, wherein the parameters include the number of battery modules as k, the number of equivalent cells in each battery module as p, the total number of cells in the battery pack as n, n=k*p, and the number of sampling channels of the sampling unit as m, wherein the equivalent cell is a cell assembly formed by connecting one or more cells in parallel; If it is determined based on n, k, p, and m that the sampling unit has cross-battery module sampling and there is at least one sampling channel in the sampling unit that can be used as the target sampling channel, then the number of sampling units required in the battery pack voltage sampling circuit is determined based on n, p, and m.

2. The method according to claim 1, It is characterized in that The determining, according to the n, k, p, and m, that the sampling unit has cross-battery module sampling and that there is at least one sampling channel in the sampling unit that can be used as the target sampling channel includes: If k is greater than or equal to 2, then according to the size relationship between n and m-1 and the size relationship between m-1 and p, it is determined that the sampling unit has cross-battery module sampling and there is at least one sampling channel in the sampling unit that can be used as the target sampling channel, and m-1 is the number of battery cells that can be collected by the sampling unit when a sampling channel is set between every two adjacent battery cells.

3. The method according to claim 2, It is characterized in that The determining, based on the size relationship between n and m-1 and the size relationship between m-1 and p, that the sampling unit has cross-battery module sampling and that at least one sampling channel in the sampling unit can be used as the target sampling channel includes: If n is less than m-1, it is determined that the sampling unit has cross-battery module sampling and there is at least one sampling channel in the sampling unit that can be used as the target sampling channel; If n is greater than m-1 and m-1 is greater than p, it is determined that the sampling unit has cross-battery module sampling and there is at least one sampling channel in the sampling unit that can be used as the target sampling channel.

4. The method according to any one of claims 1 to 3, It is characterized in that The method of determining the number of sampling units required in the battery pack voltage sampling circuit according to n, p and m includes: If n is less than m-1, the number of sampling units required in the battery pack voltage sampling circuit is determined according to m, n, and k; If n is greater than m-1, based on m and p, determine the number of battery modules sampled by the sampling unit to be h, where h is an integer obtained by rounding down the ratio of m to p; based on n, m, p, and h, determine the number of sampling units required in the battery pack voltage sampling circuit.

5. The method according to claim 4, It is characterized in that The step of determining the number of sampling units required in the battery pack voltage sampling circuit according to the n, m, p, and h includes: According to m, p, h, get mp*h; If the ratio of mp*h to h is greater than or equal to 1, the number of sampling units required in the battery pack voltage sampling circuit is determined based on n, m, and h.

6. The method according to claim 5, It is characterized in that The step of determining the number of sampling units required in the battery pack voltage sampling circuit according to the n, m, and h includes: According to the n, m, h-1, obtain the ratio of n+1 to mh; An integer obtained by rounding up the ratio of the n+1 to mh is determined as the number of sampling units.

7. The method according to claim 5 or 6, It is characterized in that Also includes: If the ratio of mp*h to h is less than 1, at least one of n, m, k, and p is adjusted; The method for obtaining the parameters of the battery pack and the number of sampling channels of each sampling unit is m, including: Get the parameters of the adjusted battery pack and the number of sampling channels of each sampling unit.

8. The method according to claim 3, It is characterized in that Also includes: If it is determined that there is no sampling channel in the sampling unit that can be used as the target sampling channel according to the size relationship between n and m-1 and the size relationship between m-1 and p, at least one of n, m, k, and p is adjusted; The method for obtaining the parameters of the battery pack and the number of sampling channels of each sampling unit is m, including: Get the parameters of the adjusted battery pack and the number of sampling channels of each sampling unit.

9. The method according to claim 4, It is characterized in that The method of determining the number of sampling units required in the battery pack voltage sampling circuit according to m, n, and k includes: If m is greater than or equal to (n+1)+(k-1), it is determined that the number of sampling units required in the battery pack voltage sampling circuit is 1.

10. The method according to claim 9, It is characterized in that Also includes: If m is less than (n+1)+(k-1), at least one of n, m, k, and p is adjusted: The method for obtaining the parameters of the battery pack and the number of sampling channels of each sampling unit is m, including: Get the parameters of the adjusted battery pack and the number of sampling channels of each sampling unit.

Images