Battery monitoring device, battery cell module and battery pack

Abstract

According to the battery cell monitoring device provided by the invention, the front-stage connector of the monitoring module is internally connected with the rear-stage connector of the monitoring module and externally connected with the rear-stage connector of the front-stage module, namely, the rear-stage connector of the front-stage module is extended to the rear-stage connector of the monitoring module. When a next-stage battery cell needs to be added on the basis of the current stage, only the added battery cell needs to be connected to the rear-stage connector of the monitoring module of the current stage, the monitoring module of the current stage can transmit monitoring data of the added battery cell to the front stage and finally transmit the monitoring data to the monitoring system, and the monitoring system monitors the battery cell based on the monitoring data. When the battery cells need to be reduced on the basis of the current level, the monitoring module of the current level and the battery cells corresponding to the monitoring module can be directly removed, the removal behavior does not affect battery cell monitoring of the modules of the previous levels, the number of the battery cells of the module can be increased or decreased on the current level, a circuit does not need to be redesigned, and the cost is reduced. And the expandability of the battery cell module is greatly improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery monitoring device, a battery cell module and a battery pack. Background Art

[0002] The cell monitoring of the battery pack generally monitors the temperature and voltage data of the battery cells. Currently, there are two collection methods: wiring harness and flexible printed circuit (FPC). For the wiring harness collection method, because the wiring harness occupies a large space in the battery pack, for a battery pack with more cells, it is not possible to collect the temperature and voltage data of all the cells in the battery pack. Only important temperature point data can be collected based on the simulation results. This collection method collects less temperature data, which will have a certain impact on the thermal management strategy. For the FPC collection method, its advantage is that the FPC occupies a small space and can fully collect the temperature and voltage data of the battery cell, that is, the temperature and voltage of each battery cell can be recorded. However, when the number of cells in the battery module in the battery pack changes, the FPC circuit needs to be redesigned. Summary of the invention

[0003] In order to solve the above problems, the present application provides a battery monitoring device, a battery cell module and a battery pack.

[0004] The first aspect of the present application provides a battery cell monitoring device, comprising: A monitoring module provided in the battery cell, the monitoring module being connected between the front-stage module and the rear-stage module; The monitoring module includes a plurality of front-stage connectors and a plurality of rear-stage connectors; The front-stage connector of the monitoring module is internally connected to the rear-stage connector of the monitoring module in a one-to-one correspondence, and is externally connected to the rear-stage connector of the front-stage module; The rear-stage connector of the monitoring module is externally used to connect to the front-stage connector of the rear-stage module; The monitoring module is at least used to transmit the monitoring data of the battery cell corresponding to the subsequent module to the preceding module, so that the monitoring data is finally transmitted to the monitoring system, and the monitoring system performs battery cell monitoring based on the monitoring data.

[0005] Optionally, the monitoring module is connected to the front-stage module via N wire harnesses, and the monitoring module is connected to the rear-stage module via N-2 wire harnesses, where N is an even number greater than or equal to 4.

[0006] Optionally, the monitoring module further includes a cell connector and a collection connector; The cell connector of the monitoring module is connected to the cell corresponding to the monitoring module; The acquisition connector of the monitoring module is internally connected to the battery connector of the monitoring module, and is externally used to connect to the rear-stage connector of the front-stage module; The rear-stage connector of the monitoring module is also used to connect to the collection connector of the rear-stage module.

[0007] Optionally, the front-stage module is an outlet module at the first stage, and the outlet module includes a connector, a battery core connector and a plurality of rear-stage connectors; The cell connector of the outlet module is connected to the cell corresponding to the outlet module, and is used to collect monitoring data of the cell corresponding to the outlet module; A part of the rear-stage connectors of the outlet module is connected to the front-stage connector of the monitoring module, and another part of the rear-stage connectors is connected to the collection connector of the monitoring module; The first end of the connector is connected to the monitoring system, and the second end is respectively connected to the battery cell connector of the outlet module and each subsequent connector of the outlet module, so as to receive monitoring data of the battery cell from the battery cell connector of the outlet module and / or each subsequent connector of the outlet module, and transmit the received monitoring data to the monitoring system.

[0008] Optionally, the sum of the number of the collection connector of the monitoring module and the number of the front-stage connectors is equal to the number of the rear-stage connectors of the outlet module.

[0009] Optionally, the monitoring module is an Nth level module, the preceding level module is an N-1th level module, the succeeding level module is an N+1th level module, and N is a positive integer greater than or equal to 3; The front-stage module includes multiple front-stage connectors, multiple rear-stage connectors, battery cell connectors and collection connectors; the front-stage connectors of the front-stage module are internally connected to the rear-stage connectors of the front-stage module in a one-to-one correspondence, and are externally connected to the rear-stage connectors of the N-2-stage module; the rear-stage connectors of the front-stage module are externally connected to the front-stage connectors or collection connectors of the monitoring module; the battery cell connectors of the front-stage module are connected to the battery cells corresponding to the front-stage module; the collection connectors of the front-stage module are internally connected to the battery cell connectors of the front-stage module, and are externally connected to the rear-stage connectors of the N-2-stage module; The rear-stage module includes multiple front-stage connectors, multiple rear-stage connectors, battery cell connectors and collection connectors; the front-stage connectors of the rear-stage module are internally connected to the rear-stage connectors of the rear-stage module in a one-to-one correspondence, and are externally connected to the rear-stage connectors of the monitoring module; the rear-stage connectors of the rear-stage module are externally used to connect to the front-stage connectors or collection connectors of the N+2-stage module; the battery cell connectors of the rear-stage module are connected to the corresponding batteries of the rear-stage module; the collection connectors of the rear-stage module are internally connected to the battery cell connectors of the rear-stage module, and externally connected to the rear-stage connectors of the monitoring module.

[0010] Optionally, a temperature sensor is provided on the battery cell connector of the monitoring module.

[0011] Optionally, the battery cell connector includes a first battery cell connector and a second battery cell connector, the first battery cell connector and the second battery cell connector are connected to the same battery cell, the first battery cell connector is used to collect first monitoring data of the battery cell, the first monitoring data includes voltage and / or temperature data, and the second battery cell connector is used to collect second monitoring data of the battery cell, the second monitoring data is other data different from the first monitoring data.

[0012] A second aspect of the present application provides a battery cell module, comprising any one of the battery cell monitoring devices provided in the first aspect.

[0013] A third aspect of the present application provides a battery pack, comprising any one of the battery cell modules provided in the second aspect.

[0014] Advantages and beneficial effects of this application: The battery cell monitoring device provided by the present application has a front-stage connector of the monitoring module connected to the rear-stage connector of the monitoring module internally and connected to the rear-stage connector of the front-stage module externally, which is equivalent to extending the rear-stage connector of the front-stage module to the rear-stage connector of the monitoring module. When it is necessary to add a battery cell of the next level on the basis of the current level, it is only necessary to connect the added battery cell to the rear-stage connector of the monitoring module of the current level, and the monitoring module of the current level can transmit the monitoring data of the added battery cell to the previous level, and finally transmit it to the monitoring system, and the monitoring system realizes the monitoring of the battery cell based on the monitoring data. When it is necessary to reduce the battery cell on the basis of the current level, the monitoring module of the current level and the battery cell corresponding to the monitoring module can be directly removed, and the removal behavior will not affect the battery cell monitoring of the modules at the previous levels, and the increase or decrease of the number of module batteries can be realized at the current level, without the need to redesign the circuit, which greatly improves the scalability of the battery cell module. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A connection block diagram of a battery monitoring device provided by the present invention in one embodiment; Figure 2 A connection block diagram of a battery monitoring device provided by the present invention in another embodiment; Figure 3 A circuit connection diagram of a monitoring module according to an embodiment of the present invention; Figure 4 A circuit connection diagram of a lower outlet module according to an embodiment of the present invention; Figure 5 A schematic diagram of the structure of a battery cell module in an application example provided by the present invention; Figure 6 This is a connection block diagram of a battery detection device in an application example provided by the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0020] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Battery cell monitoring of battery packs is an important means to ensure battery safety. Generally speaking, battery cell monitoring is to monitor the temperature and voltage data of battery cells. In related technologies, there are two collection methods for collecting monitoring data of battery cells: wiring harness and flexible printed circuit (FPC). For the wiring harness collection method, because the wiring harness occupies a large space in the battery pack, for battery packs with more cells, it is not possible to collect the temperature and voltage data of all cells in the battery pack, and only important temperature point data can be collected based on simulation results. This collection method collects less temperature data, which will have a certain impact on the thermal management strategy. For the FPC collection method, its advantage is that the FPC occupies a small space and can fully collect the temperature and voltage data of the battery cell, that is, the temperature and voltage of each battery cell can be recorded.

[0023] However, the disadvantage of the FPC acquisition method is that when the number of cells in the battery module in the battery pack changes, the FPC circuit needs to be redesigned, which costs a lot of time and money.

[0024] refer to Figure 1-2 The battery cell monitoring device provided in the embodiment of the present application includes: a monitoring module, which can be set in a battery cell. The monitoring module can be connected to the previous module forward, and can be extended to connect the next module backward. It should be noted that the previous module, the monitoring module and the next module can be a multi-stage series connection relationship, the previous module is the previous module of the monitoring module, the next module is the next module of the monitoring module, and the monitoring module can also be called a current module.

[0025] The monitoring module may include multiple front-stage connectors and multiple rear-stage connectors. In one embodiment, the number of front-stage connectors and rear-stage connectors may be equal. For the connection mode inside the monitoring module, each front-stage connector of the monitoring module may be connected to the rear-stage connector of the monitoring module in a one-to-one correspondence. For the connection mode outside the monitoring module, the front-stage connector of the monitoring module may be connected to the rear-stage connector of the front-stage module, and the rear-stage connector of the monitoring module may be connected to the front-stage connector of the rear-stage module. The monitoring module is at least capable of transmitting the monitoring data of the battery cell corresponding to the rear-stage module to the front-stage module, and then the front-stage module continuously forwards the data, and finally the monitoring data is transmitted to the monitoring system, and the monitoring system monitors the battery cell based on the monitoring data.

[0026] The battery cell monitoring device provided by the present application has a front-stage connector of the monitoring module connected to the rear-stage connector of the monitoring module internally and connected to the rear-stage connector of the front-stage module externally, which is equivalent to extending the rear-stage connector of the front-stage module to the rear-stage connector of the monitoring module. When it is necessary to add a battery cell of the next level on the basis of the current level, it is only necessary to connect the added battery cell to the rear-stage connector of the monitoring module of the current level, and the monitoring module of the current level can transmit the monitoring data of the added battery cell to the previous level, and finally transmit it to the monitoring system, and the monitoring system realizes the monitoring of the battery cell based on the monitoring data. When it is necessary to reduce the battery cell on the basis of the current level, the monitoring module of the current level and the battery cell corresponding to the monitoring module can be directly removed, and the removal behavior will not affect the battery cell monitoring of the modules at the previous levels, and the increase or decrease of the number of module batteries can be realized at the current level, without the need to redesign the circuit, which greatly improves the scalability of the battery cell module.

[0027] There are many ways to monitor the battery cells at this level. Figure 1 As shown, the battery cell of this level can be connected to a battery cell connector, and the battery cell connector can be directly connected to the rear-stage connector of the front-stage module, that is, the monitoring data of the battery cell will not pass through the monitoring module of this level, but will be directly transmitted to the front-stage module, and then forwarded step by step through the front-stage module, and finally transmitted to the output module at the first level, and the output module will transmit the monitoring data to the monitoring system. In this embodiment, the monitoring data transmitted forward by the monitoring module does not include the monitoring data of the battery cell of this level, but only includes the monitoring data of the battery cell corresponding to the rear-stage module, because the monitoring data of the battery cell of this level directly skips this level and is transmitted to the front level.

[0028] In one embodiment, if Figure 2As shown, the monitoring data of the battery cell at this level can also be first transmitted to the monitoring module at this level, and then transmitted forward by the monitoring module at this level. Specifically, the monitoring module can also include a battery cell connector and a collection connector. The battery cell connector of the monitoring module is connected to the battery cell at this level. The collection connector of the monitoring module can be connected to the battery cell connector internally and can be connected to the rear-stage connector of the front-stage module externally. Therefore, the collected monitoring data of the battery cell can be transmitted to the front-stage module, and then forwarded step by step through the front-stage module, and finally transmitted to the output module at the first level, and the output module transmits the monitoring data to the monitoring system. In this embodiment, the monitoring data transmitted forward by the monitoring module includes both the monitoring data of the battery cell at this level and the monitoring data of the battery cell corresponding to the rear-stage module.

[0029] It should be noted that, in one embodiment, the acquisition connector, the front-stage connector and the rear-stage connector can be the same type of connector, that is, the so-called acquisition, front-stage and rear-stage are distinguished from the function of the connector or the corresponding level, and the connectors themselves can be the same. In one embodiment, the acquisition connector, the front-stage connector and the rear-stage connector can also be different types of connectors, as long as they can meet the transmission requirements of the battery cell monitoring data.

[0030] In one embodiment, if the monitoring module of this level is a monitoring module at the second level, the front-stage module of the monitoring module is the outlet module at the first level. In one embodiment, the outlet module may include a connector, a cell connector and a plurality of rear-stage connectors. The outlet module may be arranged on the cell of the first level, and the cell connector may be connected to the first-level cell for collecting monitoring data of the first-level cell. One end of the connector may be connected to the monitoring system, and the other end may be connected to the cell connector, and connected to each rear-stage connector respectively, so as to transmit the cell monitoring data transmitted from the cell connector and each rear-stage connector to the monitoring system. It can be understood that the connector may be an interface between the battery pack slave control and the monitoring system. Among the plurality of rear-stage connectors of the outlet module, a part is connected to the front-stage connector of the monitoring module, and a part is connected to the collection connector of the monitoring module. For example, the outlet module may have at least 2 rear-stage connectors connected to the collection connector of the monitoring module, and the remaining rear-stage connectors are connected to the front-stage connector of the monitoring module.

[0031] In one embodiment, if the level of the monitoring module of this level is greater than 2, that is, the level is greater than or equal to 3, then the front-stage module and the rear-stage module of the monitoring module of this level are the same monitoring modules. Specifically, if the monitoring module is the S-level module, the front-stage module is the S-1-level module, the rear-stage module is the S+1-level module, and S is a positive integer greater than or equal to 3. For the front-stage module, it includes a plurality of front-stage connectors, a plurality of rear-stage connectors, a battery connector and a collection connector, wherein the front-stage connector of the front-stage module is connected to the rear-stage connector of the front-stage module one by one internally, and is connected to the rear-stage connector of the S-2-level module externally; the rear-stage connector of the front-stage module is externally connected to the front-stage connector or the collection connector of the monitoring module; the battery connector of the front-stage module is connected to the battery corresponding to the front-stage module; the collection connector of the front-stage module is internally connected to the battery connector of the front-stage module, and is externally connected to the rear-stage connector of the S-2-level module. It can be understood that the S-2-level module is the previous module of the front-stage module. Similarly, the rear-stage module also includes multiple front-stage connectors, multiple rear-stage connectors, battery cell connectors and collection connectors; the front-stage connectors of the rear-stage module are connected to the rear-stage connectors of the rear-stage module one by one internally, and are connected to the rear-stage connectors of the monitoring module externally; the rear-stage connectors of the rear-stage module are used to connect to the front-stage connectors or collection connectors of the S+2nd-stage module externally; the battery cell connectors of the rear-stage module are connected to the corresponding batteries of the rear-stage module; the collection connectors of the rear-stage module are connected to the battery cell connectors of the rear-stage module internally, and are connected to the rear-stage connectors of the monitoring module externally. It can be understood that the S+2nd-stage module is the rear-stage module of the rear-stage module.

[0032] In one embodiment, the cell monitoring device can be composed of two modules, namely, an outlet module and a monitoring module. The outlet module is at the first level, and the monitoring module of the second level is directly connected to the outlet module, and the monitoring module of the third level is connected to the monitoring module of the second level... Since the monitoring module actually extends the available rear-stage connector of the front-stage module to this level, the cells can be increased at this level. Therefore, for the cell module, the cells cannot be increased indefinitely, and the maximum number of cells of the cell module is limited by the number of rear-stage connectors of the outlet module. For example, if the outlet module has 18 rear-stage connectors, it means that the maximum number of cells of the entire cell module is 10 (the outlet module itself can connect 1 cell, and 18 rear-stage connectors can connect 9 cells). If the outlet module has 20 rear-stage connectors, it means that the maximum number of cells of the entire cell module is 11 (the outlet module itself can connect 1 cell, and 18 rear-stage connectors can connect 10 cells). To ensure that all rear-stage connectors of the outlet module can be extended to the next stage, in one embodiment, the sum of the number of front-stage connectors and collection connectors (2) provided in the monitoring module can be equal to the number of rear-stage connectors of the outlet module.

[0033] In one embodiment, the monitoring module is connected to the previous module via N wiring harnesses, where N is an even number greater than or equal to 4. It is understandable that this means that the monitoring module at this level inherits N available connectors that are not occupied by battery cells from the previous module. For an embodiment in which the monitoring data of the battery cells at this level are directly transmitted to the previous module without passing through the monitoring module at this level, the N wiring harnesses are all connecting lines between the front connector of the monitoring module and the rear connector of the previous module. Since 2 of the N available connectors of the monitoring module at this level will be directly connected to the battery cells at the next level, for the module behind the rear module, the actual number of available connectors is N-2, and the rear module only needs to connect the N-2 front connectors to the rear connector of the monitoring module at this level, which can save the cost of 2 wiring harnesses. For the embodiment in which the battery cells at this level transmit monitoring data through the monitoring module at this level, the N wiring harnesses can be composed of 2 first connecting wires and the remaining second connecting wires. The first connecting wires can be the connecting wires between the acquisition connector of the monitoring module and the rear-stage connector of the front-stage module, and the second connecting wires can be the connecting wires between the front-stage connector of the monitoring module and the rear-stage connector of the front-stage module. Since 2 of the N available connectors will be occupied by the battery cells at this level, the actual number of available connectors for the rear-stage module is N-2. Therefore, in one embodiment, the rear-stage module only needs to connect the N-2 front-stage connectors to the rear-stage connector of the monitoring module at this level, which can save the cost of 2 wiring harnesses.

[0034] In one embodiment, in order to monitor the temperature of the battery cell, a temperature sensor may be provided on the battery cell connector.

[0035] In one embodiment, the battery cell connector may include a first battery cell connector and a second battery cell connector. The first battery cell connector and the second battery cell connector may be connected to the same battery cell. The first battery cell connector is used to collect first monitoring data of the battery cell. The first monitoring data may be, for example, voltage and / or temperature data. The second battery cell connector is used to collect second monitoring data of the battery cell. The second monitoring data is other data different from the first monitoring data, such as the remaining power, current, SOC, etc. of the battery cell.

[0036] In one embodiment, the battery cell connector may specifically be a nickel sheet, which may be laser welded to the aluminum row of the battery cell and may transmit monitoring data such as the voltage and temperature of the battery cell.

[0037] It should be noted that the expressions first-level battery cells, second-level battery cells, battery cells at this level, battery cells at the next level, battery cells at the previous level, etc. in this document are only for the convenience of referring to the battery cells corresponding to the monitoring modules or output modules that have a step-by-step connection relationship. For example, the first-level battery cells refer to the battery cells corresponding to the output modules at the first level, and the second-level battery cells refer to the battery cells corresponding to the monitoring modules at the second level. However, the connection relationship between the battery cells is not limited, that is, the battery cells can be connected in series, in parallel or mixed, and this application does not limit this.

[0038] For ease of understanding, this application provides a specific structure of a monitoring module, which can be found in Figure 3 , Figure 3 A circuit connection diagram of a monitoring module under an embodiment of the present invention. The monitoring module includes two first battery cell connectors, which are respectively used to connect to the positive and negative electrodes of the battery cell, and are used to collect the first monitoring data of the battery cell. The first monitoring data may be, for example, voltage and / or temperature data. Two second battery cell connectors are respectively used to connect to the positive and negative electrodes of the battery cell, and are used to collect the second monitoring data of the battery cell. The second monitoring data is other data different from the first monitoring data, such as the remaining power, current, SOC, etc. of the battery cell. A temperature sensor is arranged on the first battery cell connector to collect the temperature data of the battery cell. Two collection connectors are respectively connected to the two first battery cell connectors internally, and are externally connected to the rear-stage connector of the front-stage module to transmit the monitoring data of the battery cell at this level forward. Multiple front-stage connectors are internally connected to multiple rear-stage connectors one by one, and are externally connected to the rear-stage connector of the front-stage module. Multiple rear-stage connectors are externally connected to the front-stage connector or collection connector of the rear-stage module.

[0039] This application also provides a specific structure of an outlet module, which can be found in Figure 4 , Figure 4 A circuit connection diagram of an outlet module under an embodiment of the present invention. The outlet module includes two first battery cell connectors, which are respectively used to connect to the positive and negative poles of the battery cell, and are used to collect the first monitoring data of the battery cell. The first monitoring data may be, for example, voltage and / or temperature data. Two second battery cell connectors are respectively used to connect to the positive and negative poles of the battery cell, and are used to collect the second monitoring data of the battery cell. The second monitoring data is other data different from the first monitoring data, such as the remaining power, current, SOC, etc. of the battery cell. A temperature sensor is provided on the first battery cell connector to collect the temperature data of the battery cell. A connector, one end of which can be connected to a monitoring system, and the other end of which can be respectively connected to two first battery cell connectors, two second battery cell connectors, and each subsequent connector, so as to transmit the monitoring data of the battery cell transmitted from the first battery cell connector, the second battery cell connector, and / or each subsequent connector to the monitoring system. Multiple subsequent connectors are externally connected to the front connector or the collection connector of the next-level module.

[0040] The following is an application example for reference. Figure 5 and Figure 6 The battery cell module includes 4 battery cells, corresponding to a 4-level module. The current demand is to add 1 battery cell.

[0041] The outlet module 100 is the first stage, which is arranged on a cell and includes a connector 101, a first cell connector 103, a second cell connector 105 and 18 subsequent connectors 102. One end of the connector 101 is connected to the monitoring system, and the other end is respectively connected to the first cell connector 103, the second cell connector 105 and the 18 subsequent connectors 102. Among them, a temperature sensor 104 is arranged on the first cell connector 103.

[0042] The second-stage monitoring module 200 includes a first cell connector 204, a second cell connector 206, two collection connectors 202, 16 front-stage connectors 201 and 16 rear-stage connectors 203. The outlet module 100 is connected to the second-stage monitoring module 200 through 18 wire harnesses. Specifically, two wire harnesses connect the two rear-stage connectors 102 of the outlet module 100 with the two collection connectors 202 of the second-stage monitoring module 200, and 16 wire harnesses connect the 16 rear-stage connectors 102 of the outlet module 100 with the 16 front-stage connectors 201 of the second-stage monitoring module 200.

[0043] The third-level monitoring module 300 is the same module as the second-level monitoring module 200, and also includes a first battery cell connector, a second battery cell connector, two collection connectors, 16 front-stage connectors and 16 rear-stage connectors. The second-level monitoring module 200 and the third-level monitoring module 300 are connected by 16 wire harnesses. Specifically, two wire harnesses connect the two rear-stage connectors of the second-level monitoring module 200 with the two collection connectors of the third-level monitoring module 300, and 14 wire harnesses connect the 14 rear-stage connectors of the second-level monitoring module 200 with the 14 front-stage connectors of the third-level monitoring module 300. Figure 4 In the figure, two front-stage connectors and two corresponding rear-stage connectors that are not connected to the second-stage monitoring module 200 are shown by dotted-line circles at the third-stage monitoring module 300.

[0044] The fourth-level monitoring module 400 is the same module as other monitoring modules, and also includes a first battery cell connector, a second battery cell connector, two collection connectors, 16 front-stage connectors and 16 rear-stage connectors. The third-level monitoring module 300 and the fourth-level monitoring module 400 are connected by 14 wire harnesses. Specifically, two wire harnesses connect the two rear-stage connectors of the third-level monitoring module 300 with the two collection connectors of the fourth-level monitoring module 400, and 12 wire harnesses connect the 12 rear-stage connectors of the third-level monitoring module 300 with the 12 front-stage connectors of the fourth-level monitoring module 400. Figure 4 In the figure, four front-stage connectors and corresponding four rear-stage connectors that are not connected to the third-stage monitoring module 300 are shown by dashed-line circles at the fourth-stage monitoring module 400.

[0045] When adding the fifth battery cell, a monitoring module can be set on the battery cell as a fifth-level monitoring module. The fifth-level monitoring module is the same module as other monitoring modules, and also includes a first battery cell connector, a second battery cell connector, two collection connectors, 16 front-stage connectors and 16 rear-stage connectors. The fourth-level monitoring module 400 can be connected to the fifth-level monitoring module through 12 wire harnesses. Specifically, 2 wire harnesses connect the 2 rear-stage connectors of the fourth-level monitoring module 400 with the 2 collection connectors of the fifth-level monitoring module, and 10 wire harnesses connect the 10 rear-stage connectors of the fourth-level monitoring module 400 with the 10 front-stage connectors of the fifth-level monitoring module. In this way, the addition of the fifth battery cell is completed.

[0046] The battery cell monitoring device provided by the present application has a front-stage connector of the monitoring module that is internally connected to the rear-stage connector of the monitoring module and externally connected to the rear-stage connector of the front-stage module, which is equivalent to extending the rear-stage connector of the front-stage module to the rear-stage connector of the monitoring module. When it is necessary to add batteries of the next level on the basis of the current level, it is only necessary to connect the added batteries to the rear-stage connector of the monitoring module of the current level. When it is necessary to reduce batteries on the basis of the current level, the monitoring module of the current level and the batteries corresponding to the monitoring module can be directly removed, and the removal behavior will not affect the battery cell monitoring of the previous modules. The number of module batteries can be increased or decreased at the current level without redesigning the circuit, which greatly improves the scalability of the battery cell module.

[0047] The present application also provides a battery cell module, comprising a plurality of battery cells and a battery monitoring device corresponding to any embodiment provided in the present application.

[0048] The present application also provides a battery pack, comprising one or more of the above-mentioned battery cell modules.

[0049] As long as there is no conflict or contradiction in the technical features provided in the above embodiments, those skilled in the art can combine the various technical features according to actual conditions to form various different embodiments. However, due to the limited length of this application document, various different embodiments are not described in detail, but it can be understood that various different embodiments also fall within the scope disclosed in the embodiments of this application.

[0050] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery cell monitoring device, characterized in that: include: A monitoring module is provided in the battery cell, the monitoring module is connected between the front-stage module and the rear-stage module, the monitoring module is connected to the front-stage module forwardly, and the monitoring module is extended backwardly to connect to the rear-stage module; The monitoring module includes a plurality of front-stage connectors and a plurality of rear-stage connectors; The front-stage connector of the monitoring module is internally connected to the rear-stage connector of the monitoring module in a one-to-one correspondence, and is externally connected to the rear-stage connector of the front-stage module; The rear-stage connector of the monitoring module is externally used to connect to the front-stage connector of the rear-stage module; The monitoring module is at least used to transmit the monitoring data of the battery cell corresponding to the subsequent module to the preceding module, so that the monitoring data is finally transmitted to the monitoring system, and the monitoring system performs battery cell monitoring based on the monitoring data.

2. The battery cell monitoring device according to claim 1, characterized in that: The monitoring module is connected to the front-stage module via N wire harnesses, and the monitoring module is connected to the rear-stage module via N-2 wire harnesses, where N is an even number greater than or equal to 4.

3. The battery cell monitoring device according to claim 1, characterized in that: The monitoring module also includes a battery cell connector and a collection connector; The cell connector of the monitoring module is connected to the cell corresponding to the monitoring module; The acquisition connector of the monitoring module is internally connected to the battery connector of the monitoring module, and is externally used to connect to the rear-stage connector of the front-stage module; The rear-stage connector of the monitoring module is also used to connect to the collection connector of the rear-stage module.

4. The battery cell monitoring device according to claim 3, characterized in that: The front-stage module is an outlet module at the first stage, and the outlet module includes a connector, a battery core connector and a plurality of rear-stage connectors; The cell connector of the outlet module is connected to the cell corresponding to the outlet module, and is used to collect monitoring data of the cell corresponding to the outlet module; A part of the rear-stage connectors of the outlet module is connected to the front-stage connector of the monitoring module, and another part of the rear-stage connectors is connected to the collection connector of the monitoring module; The first end of the connector is connected to the monitoring system, and the second end is respectively connected to the battery cell connector of the outlet module and each subsequent connector of the outlet module, so as to receive monitoring data of the battery cell from the battery cell connector of the outlet module and / or each subsequent connector of the outlet module, and transmit the received monitoring data to the monitoring system.

5. The battery cell monitoring device according to claim 4, characterized in that: The sum of the number of the collection connector of the monitoring module and the number of the front-stage connectors is equal to the number of the rear-stage connectors of the outlet module.

6. The battery cell monitoring device according to claim 3, characterized in that: The monitoring module is an S-th level module, the preceding module is an S-1-th level module, the following module is an S+1-th level module, and S is a positive integer greater than or equal to 3; The front-stage module includes multiple front-stage connectors, multiple rear-stage connectors, battery cell connectors and collection connectors; the front-stage connectors of the front-stage module are internally connected to the rear-stage connectors of the front-stage module in a one-to-one correspondence, and are externally connected to the rear-stage connectors of the S-2-stage module; the rear-stage connectors of the front-stage module are externally connected to the front-stage connector or the collection connector of the monitoring module; the battery cell connectors of the front-stage module are connected to the battery cells corresponding to the front-stage module; the collection connectors of the front-stage module are internally connected to the battery cell connectors of the front-stage module, and are externally connected to the rear-stage connectors of the S-2-stage module; The rear-stage module includes multiple front-stage connectors, multiple rear-stage connectors, battery cell connectors and collection connectors; the front-stage connectors of the rear-stage module are internally connected to the rear-stage connectors of the rear-stage module in a one-to-one correspondence, and are externally connected to the rear-stage connectors of the monitoring module; the rear-stage connectors of the rear-stage module are externally used to connect to the front-stage connectors or collection connectors of the S+2nd-stage module; the battery cell connectors of the rear-stage module are connected to the corresponding batteries of the rear-stage module; the collection connectors of the rear-stage module are internally connected to the battery cell connectors of the rear-stage module, and externally connected to the rear-stage connectors of the monitoring module.

7. The battery cell monitoring device according to claim 3, characterized in that: A temperature sensor is arranged on the battery core connector of the monitoring module.

8. The battery cell monitoring device according to claim 3, characterized in that: The battery cell connector includes a first battery cell connector and a second battery cell connector, the first battery cell connector and the second battery cell connector are connected to the same battery cell, the first battery cell connector is used to collect first monitoring data of the battery cell, the first monitoring data includes voltage and / or temperature data, and the second battery cell connector is used to collect second monitoring data of the battery cell, the second monitoring data is other data different from the first monitoring data.

9. A battery cell module, characterized in that: Comprising a battery cell monitoring device as described in any one of claims 1 to 8.

10. A battery pack, characterized in that: Comprising the battery cell module as claimed in claim 9.

Images