Battery cell module and battery pack

Abstract

The application relates to the battery technical field and discloses a battery cell module and a battery pack. The battery cell module comprises a battery cell string, the battery cell string comprises a plurality of battery cells arranged in sequence, each battery cell has two different terminals, a first group of flow guides and a second group of flow guides are arranged side by side, both the first group of flow guides and the second group of flow guides comprise a plurality of flow guides arranged on the battery cell string, and each flow guide is connected with the different terminals of two adjacent battery cells. First temperature monitoring members are arranged on each flow guide of the first group of flow guides, or first temperature monitoring members are arranged on each flow guide of the second group of flow guides. Since the heat of the battery cell is conducted to the flow guides through the terminals, the arrangement mode of the application can ensure that the flow guide connected with at least one terminal of each battery cell is monitored, so that the battery cells in the battery cell string can be more comprehensively covered, and the problem that some battery cells have a monitoring blind area is effectively avoided.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a cell module and a battery pack. Background Technology

[0002] As the core unit of an energy storage system, the battery pack contains cell modules, which consist of cell strings. A cell string is composed of multiple cells arranged side-by-side and connected in series. Accurate monitoring of cell temperature has a significant impact on the safety, lifespan, and operational reliability of the cell module.

[0003] In related technologies, adjacent battery cells are connected in series via current-conducting busbars, and temperature monitoring devices are installed on these busbars to indirectly obtain the cell temperature. To reduce the number of temperature monitoring devices required, they are typically arranged on staggered current-conducting busbars. However, this arrangement can easily lead to monitoring blind spots in some cells within the battery string, affecting cell temperature monitoring. Summary of the Invention

[0004] This application provides a cell module and battery pack to solve or improve the problem that some cells have monitoring blind spots when temperature monitoring devices are arranged on the flow channel.

[0005] In a first aspect, this application provides a battery cell module, comprising: A battery cell string includes a plurality of battery cells arranged in sequence, each of the battery cells having two opposite terminals; The first and second sets of current guides are arranged side by side, each including multiple current guides disposed on the battery cell string, and each current guide is connected to the opposite terminals of two adjacent battery cells respectively; In this configuration, each of the first set of guide channels is provided with a first temperature monitoring element; or, each of the second set of guide channels is provided with a first temperature monitoring element.

[0006] Beneficial Effects: By installing a first temperature monitoring element on each of the first set of guide bars, or on each of the second set of guide bars, this application ensures that at least one guide bar connected to each cell's terminal is monitored, since the heat from the battery cell is conducted to the guide bars through the terminals. This arrangement achieves comprehensive coverage of the cells in the cell string, effectively avoiding the problem of monitoring blind spots for some cells. Furthermore, by installing the first temperature monitoring element only on one row of guide bars, the number of temperature monitoring elements required is reduced, thereby lowering the cost.

[0007] In one alternative embodiment, the device further includes an inlet and an outlet, the inlet being connected to the first cell in the cell string and the outlet being connected to the last cell in the cell string.

[0008] Beneficial effects: By arranging an inlet component on the first cell of the battery string, it is easier to connect the battery string to an external circuit, allowing external current to be reliably introduced into the battery string. Similarly, by arranging a lead-out component on the last cell of the battery string, it is easier to connect the battery string to an external circuit, allowing internal current to be stably extracted from the battery string, thus facilitating battery string assembly.

[0009] In one optional embodiment, each of the second set of guide vanes is provided with the first temperature monitoring element; The inlet and outlet are located at opposite ends of the cell string, with the inlet corresponding to the first set of current-carrying bars and the outlet corresponding to the second set of current-carrying bars. Beneficial effect: Based on the provision of a first temperature monitoring element on each current-carrying bar in the second set, arranging the inlet and outlet at opposite ends of the entire cell string, with them located at opposite ends of the diagonal, avoids spatial interference between the inlet and outlet and effectively prevents thermal interference caused by their close proximity.

[0010] In one alternative embodiment, the current guide includes a first connecting portion and a second connecting portion that are interconnected, and the first connecting portion and the second connecting portion are respectively connected to the opposite terminals of two adjacent battery cells.

[0011] Beneficial effects: By setting the current-conducting busbar as an interconnected first and second connection part, a relatively stable path can be formed, facilitating the series connection of adjacent cells. At the same time, it can reduce additional wires or soldering points, lowering the difficulty of busbar assembly.

[0012] In one alternative embodiment, the second group of flow channels has a first-end flow channel located at the first end along its arrangement direction, and the first connecting portion and the inlet member of the first-end flow channel are respectively connected to the opposite-shaped terminal of the first-end battery cell; In the second group of flow guides, the first temperature monitoring element is provided on the first connecting part of each flow guide.

[0013] Beneficial effects: By arranging the first connecting part and the inlet component on the first cell of the cell string, and placing the first temperature monitoring component on the first connecting part, the temperature of the first cell in the cell string can be indirectly monitored by the first temperature monitoring component through the current-carrying busbar. Simultaneously, since the first cell also has an inlet component that connects to the external circuit, monitoring the temperature of the first cell using the first temperature monitoring component can also indirectly monitor the temperature at the connection point between the inlet component and the external circuit, meeting different monitoring needs.

[0014] In one alternative embodiment, the first temperature monitoring element is located near the second connection portion.

[0015] Beneficial effects: By placing the first temperature monitoring device in the middle of the flow guide, the path length from the first temperature monitoring device to the terminals of the two adjacent cells is approximately equal. This allows for more balanced monitoring of the heating status of the two cells and effectively prevents the temperature monitoring response of one cell from lagging due to distance deviation, thereby improving the accuracy and consistency of temperature monitoring of the two cells.

[0016] In one alternative embodiment, a first thermally conductive insulating layer is provided between the first temperature monitoring element and the flow guide.

[0017] Beneficial effects: By setting a first thermally conductive insulating layer between the first temperature monitoring element and the flow guide, it is possible to ensure that the heat on the flow guide can be effectively transferred to the first temperature monitoring element, and also to prevent short circuits between the first temperature monitoring element and the flow guide.

[0018] In one optional embodiment, the number of battery cells in the battery cell string is set to 2N+1, the number of current guides in the first group of current guides is set to N, and the number of current guides in the second group of current guides is set to N, where N is a positive integer.

[0019] Beneficial effects: By setting the number of cells in the cell string to an odd number, and coordinating the placement of the lead-in component, lead-out component, first temperature monitoring component, and second temperature monitoring component, when multiple cell strings are set up, it is possible to ensure temperature monitoring of the cells in each cell string, effectively reducing the cell temperature monitoring blind zone and improving the cell temperature monitoring quality.

[0020] Secondly, this application provides a battery pack, including: a housing; The aforementioned battery cell module is disposed within the housing.

[0021] Beneficial effects: Since the battery pack includes cell modules, the battery pack has the same beneficial effects as the cell modules provided in this application, which will not be elaborated further here.

[0022] In one optional embodiment, a plurality of battery cell modules are disposed inside the housing, the plurality of battery cell modules are connected in series, and a first connecting member is disposed between adjacent battery cell modules; The battery cell module includes an inlet and an outlet. The inlet is connected to the first battery cell in the battery cell string, and the outlet is connected to the last battery cell in the battery cell string. Different first connectors can be connected to the inlet and outlet in adjacent battery cell modules respectively.

[0023] Beneficial effects: By arranging multiple cell modules within the casing, the voltage of the battery pack can be increased. Furthermore, by utilizing different first connectors, inlets, and outlets, the assembly and connection of adjacent cell modules is facilitated, while also reducing the use of additional wiring harnesses, thereby lowering the energy loss associated with connecting adjacent cell modules.

[0024] In one alternative embodiment, in adjacent battery cell modules, the lead-out member, the first lap member, and the inlet member are an integral structure.

[0025] Beneficial effects: By making the lead-out part, the first lap part and the lead-in part into a single structure, it is easier to connect adjacent battery cell modules.

[0026] In one alternative embodiment, adjacent battery cell modules can be arranged along the extension direction of the battery cell string, and the first set of current guides in one of the battery cell modules is located on the same side as the second set of current guides in the other battery cell module.

[0027] Beneficial effects: By placing the first set of current guides of one battery cell module and the second set of current guides of another battery cell module on the same side, it is possible to further place the lead-out and lead-in components in the adjacent battery cell modules on the same side, thereby facilitating the connection of the two battery cell modules with a short distance by the first connector, which is beneficial to the layout of the first connector, and can also reduce the energy loss caused by the excessively long current guide path of the first connector.

[0028] In one alternative embodiment, a plurality of the battery cell modules are arranged in at least two rows, each row including at least two battery cell modules, and the battery cell modules are connected in series end to end, with the series connection directions of adjacent rows being opposite.

[0029] Beneficial effects: By arranging multiple battery cell modules in at least two rows with the series connection directions of adjacent rows opposite, the layout of multiple battery cell modules within the housing can be facilitated, improving the compactness of the layout. Simultaneously, it can reduce the length of the first overlap required between adjacent battery cell modules, lowering material costs.

[0030] In one alternative embodiment, the lead-out member is provided with a second temperature monitoring member, which is located near the first overlap member.

[0031] Beneficial effects: By installing a second temperature monitoring device on the lead-out component, when the number of cells in a cell string is odd, the temperature of the cell at the end of the string can be indirectly monitored by the second temperature monitoring device through the lead-out component, preventing monitoring errors for cells at the end. Simultaneously, the second temperature monitoring device can monitor the temperature at the connection point between the lead-out component and the first connector, thereby achieving temperature monitoring at the connection point of adjacent cell strings. This eliminates the need for an additional independent temperature monitoring device on the first connector, further reducing the number of temperature monitoring devices and lowering operating costs.

[0032] In one alternative embodiment, a second thermally conductive insulating layer is provided between the second temperature monitoring element and the lead-out element.

[0033] Beneficial effects: By setting a second thermally conductive insulating layer between the second temperature monitoring element and the lead-out element, heat from the lead-out element can be effectively transferred to the second temperature monitoring element, while also preventing short circuits between the two elements. Therefore, this design improves the overall structural safety.

[0034] In an optional embodiment, the system further includes a main inlet and a main outlet, the main inlet being connected to the inlet in the cell module located at the first end, and the main outlet being connected to the outlet in the cell module located at the tail end. The main inlet component is equipped with a third temperature monitoring component; And / or, a fourth temperature monitoring element is provided on the main lead-out component.

[0035] Beneficial effects: By placing a third temperature monitoring device on the main inlet, which serves as the overall input terminal of the battery pack, the temperature at the junction of the main inlet and the inlet of the cell module can be monitored, as well as the temperature of the cell at the beginning of the cell string. Similarly, by placing a fourth temperature monitoring device on the main outlet, which serves as the overall output terminal of the battery pack, the temperature at the junction of the main outlet and the outlet of the cell module can be monitored, as well as the temperature of the cell at the end of the cell string. This redundant design further improves the accuracy of temperature monitoring. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 A schematic diagram showing the positional relationship between the existing first temperature monitoring element and the flow guide. Figure 2 This is a schematic diagram of the structure of the battery cell module according to an embodiment of this application; Figure 3 for Figure 2 Top view; Figure 4 for Figure 3 A magnified view of a section at point A in the middle; Figure 5 for Figure 3 A magnified view of a section at point B in the middle; Figure 6 for Figure 3 A magnified view of a section at point C; Figure 7 for Figure 2 The front view; Figure 8 for Figure 7 A magnified view of a section at point D.

[0038] Explanation of reference numerals in the attached figures: 100, battery cell string; 1001, battery cell; 1. Flow guide; 101. First connecting part; 102. Second connecting part; 1010. Head flow guide; 110. First group of flow guides; 120. Second group of flow guides; 2. First temperature monitoring component; 3. Inlet component; 4. Outlet component; 5. First overlapping component; 6. Second temperature monitoring component; 7. First thermally conductive insulating layer; 8. Second thermally conductive insulating layer; 9. Main inlet component; 10. Main outlet component; 11. Third temperature monitoring component; 12. Fourth temperature monitoring component. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] As the core unit of an energy storage system, the battery pack contains a cell module consisting of a cell string 100, which is composed of multiple cells 1001 arranged side by side and connected in series. Accurate monitoring of the temperature of the cell 1001 has a significant impact on the safety, service life, and operational reliability of the cell module.

[0041] Reference Figure 1 In related technologies, adjacent battery cells 1001 are connected in series via a current-conducting busbar 1, and a first temperature monitoring element 2 is installed on the current-conducting busbar 1 to indirectly obtain the temperature of the battery cell 1001. Furthermore, to reduce the number of first temperature monitoring elements 2, they are typically arranged on different current-conducting busbars 1 at staggered intervals. However, this arrangement of the first temperature monitoring elements 2 easily leads to… Figure 1 The cell 1001 in the dotted frame area is outside the monitoring coverage of the adjacent first temperature monitoring device 2, resulting in a monitoring blind spot for the cell 1001 in that area.

[0042] When the cell 1001 in this area experiences an internal short circuit, overheating, or other abnormalities and its temperature rises, the first temperature monitoring device 2 may not be able to monitor the temperature of the cell 1001 in this area in a timely manner. This makes it difficult for the BMS component to collect the abnormal temperature signal in this area in a timely manner, which may cause it to miss the best warning time for thermal runaway, thus posing a safety hazard.

[0043] To solve the above problems, the following will be combined with... Figures 2 to 8 This describes an embodiment of the present application.

[0044] According to an embodiment of this application, in a first aspect, this application provides a battery cell module, which includes a battery cell string 100, a first set of current guides 110, a second set of current guides 120, and a first temperature monitoring device 2.

[0045] Among them, reference Figure 2 , Figure 3 , Figure 4The cell string 100 includes multiple cells 1001 arranged sequentially. This can be understood as follows: along the extension direction of the cell string 100, a first cell 1001, a second cell 1001, a third cell 1001, ..., a 2N+1th cell 1001 are arranged sequentially, where N is a positive integer. Each cell 1001 has two terminals of opposite polarity. Specifically, each cell 1001 can be roughly rectangular or flat. Typically, two terminals of opposite polarity are arranged on the top of the cell 1001; these terminals are the terminals of the cell 1001. Therefore, it can also be understood that a positive terminal and a negative terminal are arranged on the top of the cell 1001. Furthermore, adjacent cells 1001 are typically arranged such that the positive terminal of one cell 1001 is adjacent to the negative terminal of another adjacent cell 1001, so that subsequent adjacent cells 1001 can be connected in series through the current busbar 1.

[0046] Furthermore, the first set of current guides 110 and the second set of current guides 120, arranged side by side, both extend along the arrangement direction of the battery cells 1001, and both are located in the top region of the battery cell string 100 with terminals, so as to facilitate connection with the terminals of the battery cells 1001. At the same time, the first set of current guides 110 and the second set of current guides 120 can be located on both sides of the center line of the battery cell string 100, and their extension direction is approximately parallel to the center line of the battery cell string 100.

[0047] The first group of current-conducting bars 110 and the second group of current-conducting bars 120 both include multiple current-conducting bars 1 disposed on the cell string 100. Each current-conducting bar 1 is connected to the opposite-shaped terminals of two adjacent cells 1001. Specifically, the first group of current-conducting bars 110 includes multiple current-conducting bars 1, which can be understood as a first current-conducting bar 1, a second current-conducting bar 1, a third current-conducting bar 1, ..., an Nth current-conducting bar 1 being disposed sequentially along the extension direction of the cell string 100. Each current-conducting bar 1 is connected to the opposite-shaped terminals of two adjacent cells 1001. Similarly, the second group of current-conducting busbars 120 also includes multiple current-conducting busbars 1. This can be understood as follows: along the extension direction of the cell string 100, a first current-conducting busbar 1, a second current-conducting busbar 1, a third current-conducting busbar 1, ..., the Nth current-conducting busbar 1 are sequentially arranged. Each current-conducting busbar 1 is connected to the opposite-symmetric terminals of two adjacent cells 1001. This allows two opposite-symmetric terminals of some cells 1001 to be connected to a corresponding current-conducting busbar 1 in the first group of current-conducting busbars 110 and a corresponding current-conducting busbar 1 in the second group of current-conducting busbars 120, respectively. Through this arrangement, the first group of current-conducting busbars 110 and the second group of current-conducting busbars 120 can work together to connect the cells 1001 of the cell string 100 in series, forming a complete cell series circuit.

[0048] Optionally, the current guide 1 can be made of a metal material with good electrical conductivity, such as copper or aluminum. Preferably, the current guide 1 can be made of pure aluminum with a high thermal conductivity, so that the heat of the battery cell 1001 can be effectively conducted through the current guide 1, reducing heat conduction loss and improving the detection accuracy of the first temperature monitoring element 2. Furthermore, the specific shape of the current guide 1 can be approximately rectangular, or other geometric shapes that are easy to adapt to the terminal layout. Moreover, the current guide 1 and the terminals can be fixedly connected by welding, bolting, or other methods.

[0049] Based on the above, each guide bar 1 in the first group of guide bars 110 is provided with a first temperature monitoring element 2; or, each guide bar 1 in the second group of guide bars 120 is provided with a first temperature monitoring element 2. For ease of description, the following example is provided with each guide bar 1 in the second group of guide bars 120 being provided with a first temperature monitoring element 2.

[0050] Understandably, the heat generated by the battery cell 1001 during operation is conducted to the connected current-carrying busbar 1 through the terminals of the battery cell 1001. Therefore, temperature monitoring of the current-carrying busbar 1 can indirectly provide feedback on the temperature status of the battery cell 1001 corresponding to the current-carrying busbar 1. In this embodiment, a first temperature monitoring element 2 is independently provided on each current-carrying busbar 1 belonging to the second group of current-carrying busbars 120. Therefore, at least one terminal of each battery cell 1001 connected to the current-carrying busbar 1 can be monitored, thereby achieving more comprehensive coverage of the battery cells 1001 in the battery cell string 100 and effectively avoiding the problem of monitoring blind spots for some battery cells 1001. At the same time, compared with the implementation method of providing a first temperature monitoring element 2 on each current-carrying busbar 110 and the second group of current-carrying busbars 120, this embodiment only provides a first temperature monitoring element 2 on the current-carrying busbar 110 of the second group of current-carrying busbars 120, which can effectively reduce the number of first temperature monitoring elements 2 used, thereby reducing the usage cost.

[0051] Optionally, the first temperature monitoring element 2 can be fixed to the flow guide 1 by means of bonding, fitting, or other methods. Furthermore, the specific arrangement of the first temperature monitoring element 2 can be adaptively adjusted according to actual needs. For example, the first temperature monitoring element 2 can be arranged on the surface of the flow guide 1 away from the battery cell 1001.

[0052] Optionally, the first temperature monitoring element 2 can be a component capable of temperature monitoring, such as a thermistor or a temperature sensor. For example, the first temperature monitoring element 2 can be an NTC thermistor, which has the advantages of high sensitivity and relatively low cost.

[0053] Furthermore, each first temperature monitoring element 2 can be connected to the sampling interface of the BMS component (not shown in the figure) via a signal line, so that the temperature signal detected by the first temperature monitoring element 2 can be transmitted to the BMS component in real time, so as to facilitate the monitoring of the temperature of the cell 1001 and timely feedback when the temperature of the cell 1001 is abnormal.

[0054] In some embodiments, refer to Figure 4 Each of the second set of guide bars 120 is provided with a first temperature monitoring element 2; the inlet element 3 and the outlet element 4 are located at the two ends of the diagonal of the cell string 100, and the inlet element 3 is provided in correspondence with the first set of guide bars 110, and the outlet element 4 is provided in correspondence with the second set of guide bars 120.

[0055] In this embodiment, when the first temperature monitoring element 2 is arranged on each of the guide columns 1 in the second group of guide columns 120, the inlet element 3 is arranged on one side of the arrangement direction of the first group of guide columns 110. That is, the inlet element 3 can also be understood as being located outside the starting end of the entire first group of guide columns 110, and not overlapping with any one of the guide columns 1 in the first group of guide columns 110. Similarly, the outlet element 4 is arranged on one side of the arrangement direction of the second group of guide columns 120. That is, the outlet element 4 can be understood as being located outside the end of the entire second group of guide columns 120, and not overlapping with any one of the guide columns 1 in the second group of guide columns 120.

[0056] With the above-described layout, the inlet element 3 and the outlet element 4 are arranged far apart on the outer sides of both ends of the cell string 100. On the one hand, this avoids physical interference between the inlet element 3 and the outlet element 4 in space, which is beneficial for assembling the inlet element 3 and the outlet element 4 onto different cells 1001. On the other hand, because the distance between the inlet element 3 and the outlet element 4 is relatively large, and there are multiple cells 1001 and current busbars 1 between them, it can effectively prevent mutual thermal interference caused by the inlet element 3 and the outlet element 4 being too close. Thus, when it is necessary to monitor the temperature of the inlet element 3 and the outlet element 4, the accuracy of temperature monitoring can be improved.

[0057] Understandably, the aforementioned inlet 3 can serve as the input terminal of the current input cell string 100, and the outlet 4 can serve as the output terminal of the current output cell string 100. Through the cooperation of inlet 3 and outlet 4, an interface can be formed between the cell string 100 and an external circuit.

[0058] Optionally, the lead-in component 3 and the lead-out component 4 can be copper busbars, aluminum busbars or other conductive structures. The lead-in component 3 and the lead-out component 4 can be fixedly connected to the terminals of the battery cell 1001 by means of welding, bolt connection or other methods.

[0059] In some embodiments, refer to Figure 2 , Figure 4In the first group of guide bars 110 and the second group of guide bars 120, the guide bar 1 includes a first connecting part 101 and a second connecting part 102 that are connected to each other. The first connecting part 101 and the second connecting part 102 are respectively connected to the opposite terminals of two adjacent cells 1001.

[0060] In this embodiment, when the first connecting part 101 is connected to the positive terminal of one of the battery cells 1001, the second connecting part 102 is connected to the negative terminal of another adjacent battery cell 1001, thereby enabling the two adjacent battery cell strings 100 to be connected in series through the current busbar 1. Conversely, the first connecting part 101 can also be connected to the negative terminal of one of the battery cells 1001, while the second connecting part 102 is connected to the positive terminal of another adjacent battery cell 1001. In this way, by setting the current busbar 1 as an interconnected first connecting part 101 and second connecting part 102, the first connecting part 101 and the second connecting part 102 can form a relatively stable path, facilitating the series connection of adjacent battery cell strings 100. At the same time, it can also reduce additional wires or solder points, reducing the assembly difficulty of the current busbar 1.

[0061] Optionally, the first connecting part 101 and the second connecting part 102 can be formed into an integral structure by stamping, bending or other processing methods. Alternatively, the first connecting part 101 and the second connecting part 102 can also be fixed by welding or bolt connection.

[0062] In some embodiments, refer to Figure 4 The second group of guide bars 120 has a first end guide bar 1010 located at the first end along its arrangement direction. The first connecting part 101 and the inlet 3 of the first end guide bar 1010 are respectively connected to the opposite terminal of the first end cell 1001. In the second group of guide bars 120, a first temperature monitoring element 2 is provided on the first connecting part 101 of each guide bar 1.

[0063] In this embodiment, the second set of current guides 120 has a first-end current guide 1010 and a last-end current guide 1 along its arrangement direction, and the battery cell string 100 also has a first-end battery cell 1001 and a last-end battery cell 1001 along its battery cell arrangement direction. The two opposite-shaped terminals of the first-end battery cell 1001 are connected to the inlet member 3 and the first connecting portion 101, respectively. Thus, the inlet member 3 acts as an input terminal to introduce external current into the first-end battery cell 1001. After flowing through the first-end battery cell 1001, the current flows out from the other terminal of the first-end battery cell 1001 and enters the first connecting portion 101 of the first-end current guide 1, and then passes through the second connecting portion 102 of the current guide 1 to the next battery cell 1001.

[0064] Furthermore, the first temperature monitoring element 2 is arranged on the first connection portion 101. In this case, the first temperature monitoring element 2 ensures that the temperature of the first cell 1001 in the cell string 100 is indirectly monitored by the first temperature monitoring element 2 through the current guide 1. Simultaneously, since the first cell 1001 is also provided with an inlet element 3, which is connected to an external circuit, when there is a loose connection between the inlet element 3 and the external circuit, a large amount of heat will be generated at the connection point. This heat can be conducted along the inlet element 3 to the terminals of the first cell 1001, causing the first cell 1001 to heat up. Therefore, by using the first temperature monitoring element 2 to monitor the temperature of the first cell 1001, it is also possible to indirectly monitor and provide feedback on the temperature at the connection point between the inlet element 3 and the external circuit, meeting different detection needs.

[0065] In some embodiments, refer to Figure 4 In order to further improve the monitoring accuracy of the first temperature monitoring device 2 on the adjacent battery cell 1001, the first temperature monitoring device 2 is placed close to the second connection part 102.

[0066] In this embodiment, the current guide 1 is used to connect the opposite-shaped terminals of adjacent battery cells 1001. The current guide 1 has a certain size in the arrangement direction of the adjacent battery cells 1001. The dimensions of the first connecting part 101 and the second connecting part 102 can be approximately the same, so that the connection point of the first connecting part 101 and the second connecting part 102 is approximately close to the center of the entire current guide 1. In this way, the first temperature monitoring element 2 is arranged in approximately the middle of the current guide 1, so that the path length from the first temperature monitoring element 2 to the terminals of the two adjacent battery cells 1001 is approximately equal, which can improve the accuracy and consistency of temperature monitoring of adjacent battery cells 1001.

[0067] Specifically, when two adjacent battery cells 1001 generate heat during charging and discharging, the heat can be conducted along the first connecting part 101 and the second connecting part 102 to the middle of the current busbar 1. At the same time, the temperature changes of the two battery cells 1001 can reach the first temperature monitoring element 2 approximately simultaneously. This setting can monitor the heating of the two battery cells 1001 in a relatively balanced manner, effectively preventing the situation where the temperature monitoring response of one battery cell 1001 is rapid but the temperature monitoring response of the other battery cell 1001 is delayed due to distance deviation, thereby ensuring the consistency of the temperature monitoring accuracy of the two battery cells 1001.

[0068] In some embodiments, a first thermally conductive insulating layer 7 is provided between the first temperature monitoring element 2 and the flow guide 1.

[0069] In this embodiment, the first thermally conductive insulating layer 7 has thermally conductive and insulating functions. The first thermally conductive insulating layer 7 is fixed to the flow channel 1 by means of bonding, bolting, or other methods. Then, the first temperature monitoring element 2 is fixed to the first thermally conductive insulating layer 7. This allows the first temperature monitoring element 2 to be indirectly attached to the surface of the flow channel 1 using the first thermally conductive insulating layer 7, ensuring that the heat from the flow channel 1 can be efficiently transferred to the monitoring end of the first temperature monitoring element 2. Simultaneously, the first thermally conductive insulating layer 7 has an insulating function, effectively preventing the first temperature monitoring element 2 from directly contacting the flow channel 1 and causing a short circuit risk, thus ensuring the safety of the first temperature monitoring element 2 in use.

[0070] In some embodiments, refer to Figure 2 , Figure 3 The number of cells 1001 in the cell string 100 is set to 2N+1, the number of current guides 1 in the first group of current guides 110 is set to N, and the number of current guides 1 in the second group of current guides 120 is set to N, where N is a positive integer, that is, N can be 1, 2, 3, etc.

[0071] In this embodiment, by setting the number of cells 1001 in the cell string 100 to an odd number, one terminal of the first cell 1001 in the cell string 100 is connected to the inlet 3, and one terminal of the last cell 1001 is connected to the outlet 4. Thus, each of the N current guides 1 in the second set of current guides 120 is equipped with a first temperature monitoring element 2, enabling the monitoring of the temperature of each of the two adjacent cells 1001 connected to it. Simultaneously, the temperature of the first cell 1001 is monitored by the first temperature monitoring element 2 on the first connection portion 101 of the first current guide 1, and the temperature of the last cell 1001 is monitored by a second temperature monitoring element 6 on the outlet 4. The second temperature monitoring element 6 can also monitor the temperature at the connection point between the outlet 4 and the first connecting element 5. In this way, by reducing the overall number of temperature monitoring devices and limiting the number of cells 1001 in the cell string 100 to an odd number, and by coordinating the arrangement of the inlet 3, outlet 4, first temperature monitoring device 2 and second temperature monitoring device 6, when multiple cell strings 100 are set up, it is possible to ensure that the temperature of cells 1001 in each cell string 100 is monitored, effectively reducing the temperature monitoring blind spot of cell 1001 and improving the temperature monitoring quality of cell 1001.

[0072] Understandably, since N is a positive integer, the cell module described in this embodiment can be flexibly adapted to lithium-ion battery systems with different total number of series. For example, it can be adapted to lithium-ion battery systems with various series, such as 1P26S, 1P48S, 1P52S, and 1P60S. For ease of understanding, the following description uses the cell module adapted to a 1P52S lithium-ion battery system as an example.

[0073] Specifically, the 1P52S lithium-ion battery system is composed of four independent 1P13S cell modules combined together. The four 1P13S cell modules are arranged in two rows, with each row containing two 1P13S cell modules. The four 1P13S cell modules are connected in series via the first connector 5 to form a complete 52-cell circuit.

[0074] Secondly, this application provides a battery pack, including a housing and a cell module, wherein the cell module is disposed within the housing.

[0075] In this embodiment, since the battery pack also includes the aforementioned cell module, the battery pack has the beneficial effects brought by the cell module provided in this embodiment, which will not be elaborated further here.

[0076] In some embodiments, refer to Figure 3 , Figure 5 The box contains multiple battery cell modules, which are connected in series. A first connector 5 is provided between adjacent battery cell modules. Each battery cell module includes an inlet 3 and an outlet 4. The inlet 3 is connected to the first battery cell 1001 of the battery cell string 100, and the outlet 4 is connected to the last battery cell 1001 of the battery cell string 100. Different first connectors 5 can be connected to the inlet 3 and outlet 4 of adjacent battery cell modules respectively.

[0077] In this embodiment, multiple independent battery cell modules can be sequentially arranged along the length of the housing, or sequentially along the width of the housing, or both along the length and width of the housing. By placing multiple battery cell modules within the housing, the voltage of the battery pack can be increased. Furthermore, by utilizing different first connecting members in conjunction with the lead-in and lead-out members, the assembly and connection of adjacent battery cell modules can be facilitated, while also reducing the use of additional wiring harnesses, thereby reducing the energy loss during the connection between adjacent battery cell modules.

[0078] In this embodiment, lead-out 4 serves as the current output terminal of the cell string 100. One end of lead-out 4 is connected to the cell 1001 located at the tail end of the cell string 100, and the other end is fixedly connected to the first connecting member 5. When the battery pack includes two or more cell modules, the connection between different cell modules can be achieved through the first connecting member 5. In this way, when multiple cell modules are provided, it is convenient to arrange each cell module, making the overall structure compact. At the same time, the first connecting member 5 also facilitates the assembly and connection of each cell module, reducing the assembly difficulty of the overall structure.

[0079] Optionally, the first connecting piece 5 can be a conductive structure such as a copper busbar or an aluminum busbar. Its specific shape and size can be adaptively adjusted according to the specific layout of multiple battery cell strings 100 so that adjacent battery cell strings 100 can be connected.

[0080] In some embodiments, in adjacent cell modules, the lead-out member 4, the first connecting member 5, and the lead-in member 3 are an integral structure.

[0081] In this embodiment, the lead-out part 4, the first overlapping part 5, and the lead-in part 3 can be an integrally formed structure. By integrating the above three into a whole component, compared with the three being separate parts, not only can the number of parts and assembly processes be reduced, but also no additional overlapping or welding transfer is required, thereby improving the connection efficiency and connection reliability between adjacent battery cell modules.

[0082] In some embodiments, refer to Figure 2 , Figure 3 Adjacent battery cell modules can be arranged along the extension direction of the battery cell string 100, and the first set of current guides 110 in one battery cell module is located on the same side as the second set of current guides 120 in another battery cell module.

[0083] Understandably, each cell module includes a cell string 100, in which multiple cells 1001 are arranged sequentially in a straight line, and the arrangement direction of the multiple cells 1001 is defined as the extension direction of the cell string 100. Thus, by placing the first set of current-carrying bars 110 of one cell module and the second set of current-carrying bars 120 of another cell module on the same side, it is possible to further place the lead-out members 4 and lead-in members 3 in adjacent cell modules on the same side. This facilitates the first connecting member 5 to achieve a short-distance connection between the two cell modules, which is beneficial for the layout of the first connecting member 5 and also reduces energy loss caused by excessively long current-carrying paths in the first connecting member 5.

[0084] In some embodiments, multiple battery cell modules are arranged in at least two rows, each row including at least two battery cell modules, and each battery cell module is connected in series from end to end, with the series connection directions of adjacent rows being opposite.

[0085] In this embodiment, multiple independent cell modules can be arranged sequentially along the length and width of the housing. For example, when using a 1P52S lithium-ion battery system, this battery system is composed of four independent 1P13S cell modules combined together. The four 1P13S cell modules are arranged in two rows, with each row containing two 1P13S cell modules. Furthermore, in order to connect two adjacent 1P13S cell modules in series to increase the total voltage, a first connector 5 is used as the connecting conductor between adjacent cell modules. In addition, by using different first connectors 5 in conjunction with the inlet 3 and the outlet 4, the assembly and connection of adjacent cell modules can be facilitated, and the use of additional wiring harnesses can be reduced, thereby reducing the energy loss of connecting adjacent cell modules.

[0086] Based on the above, when multiple cell modules are configured, for example, taking the 1P52S lithium-ion battery system mentioned above, two cell modules are arranged along the extension direction of the cell string 100. Furthermore, in these two cell modules, the first set of current guides 110 of one cell module and the second set of current guides 120 of the other cell module are located on the same side. Thus, by designing the positional layout of the first set of current guides 110 and the second set of current guides 120 on adjacent cell modules, the lead-out member 4 and the lead-in member 3 in adjacent cell modules can be located on the same side. This facilitates the first connecting member 5 to achieve a short-distance connection between the two cell modules, which is beneficial for the layout of the first connecting member 5 and also reduces energy loss caused by excessively long conduction paths in the first connecting member 5.

[0087] Optionally, when the battery cell module is arranged in two rows, the multiple first connecting parts 5 in the two rows can be arranged in a U-shape, that is, the current input terminal of the battery cell module at the first end and the current output terminal of the battery cell module at the last end can be located on the same side of the housing, thereby facilitating the layout of the current input and current output terminals of multiple battery cell modules in the housing.

[0088] Alternatively, when the battery cell module is arranged in two or more rows, the overall structure formed by multiple first overlapping parts 5 in the multiple rows can be arranged in an S-shape to minimize the length of the first overlapping parts 5 between two adjacent battery cell modules, thereby reducing material costs.

[0089] In some embodiments, refer to Figure 5 When the number of cells 1001 in the cell string 100 is odd, one terminal of the tail cell 1001 in the cell string 100 is connected to the current busbar 1, and the other terminal is connected to the lead-out member 4. The tail cell 1001 is prone to having a monitoring blind zone. Furthermore, a second temperature monitoring element 6 is provided on the lead-out member 4, and the second temperature monitoring element 6 is close to the first connecting member 5.

[0090] In this embodiment, a second temperature monitoring element 6 is provided on the lead-out element 4. Even if the number of cells 1001 in the cell string 100 is odd, the cell 1001 located at the end of the cell string 100 can still have its temperature indirectly monitored by the second temperature monitoring element 6 through the lead-out element 4, thereby effectively preventing the cell 1001 located at the end from having monitoring errors.

[0091] Based on this, when there are multiple cell strings 100, adjacent cell strings 100 need to be connected by a first connector 5. The connection point between the lead-out member 4 and the first connector 5 (which can also be understood as the overlap point between the lead-out member 4 and the first connector 5) is prone to overheating if loosening occurs. Therefore, monitoring of this connection point is necessary. In this embodiment, by setting a second temperature monitoring element 6 on the lead-out member 4, the heat generated at the connection point between the first connector 5 and the lead-out member 4 can be transferred to the lead-out member 4. Real-time monitoring of the temperature of the lead-out member 4 using the second temperature monitoring element 6 indirectly obtains the temperature at the connection point between the first connector 5 and the lead-out member 4, enabling temperature monitoring at the overlap point of adjacent cell strings 100. This eliminates the need for an additional independent temperature monitoring element on the first connector 5, further reducing the number of temperature monitoring elements and lowering usage costs.

[0092] Furthermore, the second temperature monitoring element 6 is arranged at the connection between the lead-out element 4 and the first overlapping element 5, so that the temperature change at the connection between the lead-out element 4 and the first overlapping element 5 can be quickly transmitted to the second temperature monitoring element 6, thereby achieving rapid response of temperature monitoring.

[0093] Optionally, the second temperature monitoring element 6 can be fixed to the lead-out element 4 by means of bonding, fitting, or other methods. The specific arrangement position of the second temperature monitoring element 6 can be adapted to actual needs. For example, the second temperature monitoring element 6 can be arranged on the surface of the lead-out element 4 away from the cell 1001.

[0094] Optionally, the second temperature monitoring element 6 can be a component capable of temperature monitoring, such as a thermistor or a temperature sensor. For example, the second temperature monitoring element 6 can be an NTC thermistor, which has the advantages of high sensitivity and relatively low cost.

[0095] In some embodiments, refer to Figure 5 A second thermally conductive insulating layer 8 is provided between the second temperature monitoring element 6 and the lead-out element 4.

[0096] In this embodiment, the second thermally conductive insulating layer 8 has both thermal conductivity and insulation functions. The second thermally conductive insulating layer 8 is fixed to the lead-out component 4 by means of bonding, bolting, or other methods. Then, the second temperature monitoring component 6 is fixed to the second thermally conductive insulating layer 8. This allows the second temperature monitoring component 6 to be indirectly attached to the surface of the lead-out component 4 via the second thermally conductive insulating layer 8, ensuring that the heat from the lead-out component 4 can be efficiently transferred to the monitoring end of the second temperature monitoring component 6. Simultaneously, the second thermally conductive insulating layer 8 has an insulating function, effectively preventing the second temperature monitoring component 6 from directly contacting the lead-out component 4 and causing a short circuit risk, thus ensuring the safety of the second temperature monitoring component 6 in use.

[0097] Optionally, the first thermally conductive insulating layer 7 between the first temperature monitoring element 2 and the flow guide 1, and the second thermally conductive insulating layer 8 between the second temperature monitoring element 6 and the lead-out element 4, can be structures such as thermally conductive silicone pads, ceramic insulating sheets, or thermally conductive silicone grease coatings.

[0098] In some embodiments, refer to Figure 6 , Figure 7 , Figure 8 The battery pack also includes a main inlet 9 and a main outlet 10. The main inlet 9 is connected to the inlet 3 in the cell module at the first end, and the main outlet 10 is connected to the outlet 4 in the cell module at the last end. Specifically, when multiple cell modules are connected in series inside the housing, the entire battery pack requires a main positive input terminal and a main negative output terminal to connect the battery pack to an external circuit.

[0099] Among them, reference Figure 8 A third temperature monitoring element 11 is provided on the main inlet component 9. Specifically, by arranging the third temperature monitoring element 11 on the main inlet component 9, which serves as the overall input end of the battery pack, the third temperature monitoring element 11 can monitor the temperature at the junction of the main inlet component 9 and the inlet component 3 of the cell module located at the first end. At the same time, it can also monitor the temperature of the cell 1001 located at the first end of the cell string 100. By adopting the above-mentioned redundant design, the accuracy of temperature monitoring of the entire cell module can be further improved.

[0100] Among them, reference Figure 6 A fourth temperature monitoring element 12 is provided on the main lead-out component 10. By arranging the fourth temperature monitoring element 12 on the main lead-out component 10, which serves as the overall output end of the battery pack, the fourth temperature monitoring element 12 can monitor the temperature at the junction of the main lead-out component 10 and the lead-out component 4 of the cell module located at the tail end. At the same time, it can also monitor the temperature of the cell 1001 located at the tail end of the cell string 100. With the above-mentioned redundant design, the accuracy of temperature monitoring of the entire cell module can be further improved.

[0101] Optionally, the aforementioned main inlet 9 and main outlet 10 can be conductive structures such as copper busbars or aluminum busbars.

[0102] Optionally, the third temperature monitoring element 11 and the fourth temperature monitoring element 12 can be components capable of temperature monitoring, such as thermistors or temperature sensors. For example, the third temperature monitoring element 11 and the fourth temperature monitoring element 12 can be NTC thermistors, which have the advantages of high sensitivity and relatively low cost.

[0103] Optionally, a first thermally conductive insulating layer 7 or a second thermally conductive insulating layer 8 of the same type as described above can be provided between the third temperature monitoring element 11 and the main inlet element 9 to achieve thermal conductivity and insulation between the third temperature monitoring element 11 and the main inlet element 9. Correspondingly, a first thermally conductive insulating layer 7 or a second thermally conductive insulating layer 8 of the same type as described above can be provided between the fourth temperature monitoring element 12 and the main outlet element 10 to achieve thermal conductivity and insulation between the fourth temperature monitoring element 12 and the main outlet element 10.

[0104] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery cell module, characterized in that, include: A battery cell string (100) includes a plurality of battery cells (1001) arranged in sequence, each of the battery cells (1001) having two opposite terminals; The first group of current-conducting bars (110) and the second group of current-conducting bars (120) are arranged side by side. Both of them include multiple current-conducting bars (1) arranged on the battery cell string (100). Each current-conducting bar (1) is connected to the opposite terminals of two adjacent battery cells (1001). In the first group of guide channels (110), each of the guide channels (1) is provided with a first temperature monitoring element (2); or, in the second group of guide channels (120), each of the guide channels (1) is provided with a first temperature monitoring element (2).

2. The battery cell module according to claim 1, characterized in that, It also includes an inlet (3) and an outlet (4), wherein the inlet (3) is connected to the first end of the battery cell (1001) in the battery cell string (100), and the outlet (4) is connected to the last end of the battery cell (1001) in the battery cell string (100).

3. The cell module according to claim 2, characterized in that, Each of the flow guides (1) in the second group of flow guides (120) is provided with the first temperature monitoring element (2); The inlet (3) and the outlet (4) are located at opposite ends of the diagonal of the battery cell string (100), and the inlet (3) is corresponding to the first set of guides (110), and the outlet (4) is corresponding to the second set of guides (120).

4. The cell module according to claim 3, characterized in that, The flow guide (1) includes a first connecting part (101) and a second connecting part (102) that are connected to each other. The first connecting part (101) and the second connecting part (102) are respectively connected to the opposite terminals of two adjacent cells (1001).

5. The battery cell module according to claim 4, characterized in that, The second group of guides (120) has a first end guide (1010) located at the first end along its arrangement direction. The first connecting part (101) of the first end guide (1010) and the inlet member (3) are respectively connected to the opposite terminal of the first end cell (1001). In the second group of guide tubes (120), each of the guide tubes (1) is provided with the first temperature monitoring element (2) on the first connecting part (101).

6. The cell module according to claim 5, characterized in that, The first temperature monitoring element (2) is close to the second connecting part (102).

7. The battery cell module according to any one of claims 1-6, characterized in that, A first thermally conductive insulating layer (7) is provided between the first temperature monitoring element (2) and the flow guide (1).

8. The cell module according to any one of claims 1-6, characterized in that, The number of cells (1001) in the cell string (100) is set to 2N+1, the number of current guides (1) in the first group of current guides (110) is set to N, and the number of current guides (1) in the second group of current guides (120) is set to N, where N is a positive integer.

9. A battery pack, characterized in that, include: Box; The battery cell module according to any one of claims 1-8, wherein the battery cell module is disposed in the housing.

10. The battery pack according to claim 9, characterized in that, The housing contains a plurality of battery cell modules, which are connected in series, and a first connector (5) is provided between adjacent battery cell modules. The battery cell module includes an inlet (3) and an outlet (4). The inlet (3) is connected to the first end of the battery cell (1001) of the battery cell string (100), and the outlet (4) is connected to the last end of the battery cell (1001) of the battery cell string (100). Different first connectors (5) can be connected to the inlet (3) and the outlet (4) in adjacent battery cell modules respectively.

11. The battery pack according to claim 10, characterized in that, In the adjacent battery cell modules, the lead-out member (4), the first connecting member (5), and the lead-in member (3) are an integral structure.

12. The battery pack according to claim 10, characterized in that, The adjacent battery cell modules can be arranged along the extension direction of the battery cell string (100), and the first set of current guides (110) in one of the battery cell modules is located on the same side as the second set of current guides (120) in the other battery cell module.

13. The battery pack according to claim 12, characterized in that, Multiple battery cell modules are arranged in at least two rows, each row including at least two battery cell modules, and each battery cell module is connected in series from end to end, with the series connection directions of adjacent rows being opposite.

14. The battery pack according to claim 10, characterized in that, The lead-out member (4) is provided with a second temperature monitoring member (6), which is close to the first overlap member (5).

15. The battery pack according to claim 14, characterized in that, A second thermally conductive insulating layer (8) is provided between the second temperature monitoring element (6) and the lead-out element (4).

16. The battery pack according to claim 10, characterized in that, It also includes a main inlet (9) and a main outlet (10), wherein the main inlet (9) is connected to the inlet (3) in the battery cell module located at the first end, and the main outlet (10) is connected to the outlet (4) in the battery cell module located at the tail end; The main inlet component (9) is provided with a third temperature monitoring component (11). And / or, a fourth temperature monitoring element (12) is provided on the main lead-out element (10).

Images