Battery module and energy storage equipment

Abstract

The invention relates to a battery module and energy storage equipment, the battery module comprises a battery cell group and a circuit assembly, the battery cell group comprises a plurality of battery cells arranged along a first direction, each battery cell comprises a battery cell body and a plurality of electrode terminals extending out of the battery cell body, the plurality of electrode terminals comprise two first electrode terminals and at least one second electrode terminal, and the first electrode terminals and the second electrode terminals are arranged in the first direction. The first electrode terminals and the second electrode terminals are opposite in polarity, the battery cell group comprises a first side and a second side which are opposite in the second direction, the two first electrode terminals are located on the first side and the second side respectively, the first direction is perpendicular to the second direction, the circuit assembly comprises first heating circuits, and each first heating circuit comprises a first branch and a second branch. One first branch circuit is electrically connected to the first electrode terminal, located on the first side, of one battery cell, and one second branch circuit is electrically connected to the first electrode terminal, located on the second side, of one battery cell.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage devices, and in particular to a battery module and an energy storage device. Background Art

[0002] The core component of battery energy storage equipment is the battery module, which includes multiple battery cells. In a low temperature environment, preheating the battery cells can help the battery module reach an optimal operating temperature before charging or discharging, thereby improving the performance of the battery module and extending the life of the battery module.

[0003] At present, most of the methods of heating the battery module are to set an independent heating element outside the battery cell, which makes the internal structure of the battery module more complicated. Summary of the invention

[0004] The embodiments of the present application provide a battery module and an energy storage device, which can simplify the internal structure of the battery module.

[0005] In a first aspect, an embodiment of the present application provides a battery module, comprising a cell group and a circuit assembly, the cell group comprising a plurality of cells arranged along a first direction, each cell comprising a cell body and a plurality of electrode terminals extending from the cell body, the plurality of electrode terminals comprising two first electrode terminals and at least one second electrode terminal, the first electrode terminal and the second electrode terminal having opposite polarities, the cell group comprising a first side and a second side opposite to each other along a second direction, the two first electrode terminals being respectively located on the first side and the second side, a second electrode terminal and one of the first electrode terminals being located on the same side, and the first direction being perpendicular to the second direction; the circuit assembly comprising a first heating circuit, each first heating circuit comprising a first branch and a second branch, a first branch being electrically connected to a first electrode terminal of a cell located on the first side, and a second branch being electrically connected to the first electrode terminal of the cell located on the second side.

[0006] By passing current through the pole piece inside the battery cell body to generate heat, the internal structure of the battery module is simplified compared to setting up an additional independent heating element in the battery module. The two first electrode terminals in this solution are respectively located on the first side and the second side. During the heating process of the battery cell, the two first electrode terminals are far apart, which can reduce the heat accumulation at the connection position of the two first electrode terminals and the first heating circuit, and improve the accuracy of the temperature detection of the battery cell body by the temperature sensing element near the first electrode terminal.

[0007] During the normal charging and discharging process of the battery module, the cells in the battery module need to be connected in series or in parallel. The two first electrode terminals can shunt the current flowing into or out of the cell body, thereby reducing heat generation and improving battery safety. The same cell has two first electrode terminals, which can also relatively reduce the overall internal resistance of the cell during the normal charging and discharging process of the battery module, thereby reducing heat generation and further improving battery safety.

[0008] In one or more of the above optional embodiments, the battery cell includes a soft-pack battery cell.

[0009] In one or more of the above optional embodiments, a heat insulating member is provided between adjacent battery cells, and the thermal conductivity of the heat insulating member at 25° C. is less than 1 W / (m·K).

[0010] In one or more of the above optional embodiments, the circuit assembly includes a first circuit board, the first circuit board includes a first substrate and a plurality of first conductive plates, the plurality of first conductive plates are connected to the first substrate, and one first conductive plate is electrically connected to a first branch; on the same side of adjacent battery cells, the first electrode terminal of one battery cell and the second electrode terminal of another battery cell are connected to the same first conductive plate, and the adjacent first branches are disconnected.

[0011] In one or more optional embodiments above, the first heating circuit includes an auxiliary circuit, the auxiliary circuit includes more than one first auxiliary branch, each first auxiliary branch is connected to more than two first branches, and the first branches connected to the same first auxiliary branch are not adjacent to each other. The first auxiliary branch is used to connect to an external power supply device.

[0012] In one or more of the above optional embodiments, the circuit component includes a battery management system module, the battery management system module is connected to the first circuit board, the first branch and the second branch are respectively electrically connected to the battery management system module, and the battery management system module is configured to control the disconnection and conduction of the first heating circuit.

[0013] In one or more of the above optional embodiments, the circuit assembly includes a plurality of first temperature sensing elements provided on a first circuit board, the first temperature sensing elements measure the temperature of the first conductive sheet, the first temperature sensing elements are electrically connected to the battery management system module, and transmit signals to the battery management system module; the battery management system module is configured to adjust the corresponding first heating circuit to be open circuit when the circuit assembly is in a heating state and the temperature measured by the first temperature sensing element is greater than or equal to a first threshold value, and the range of the first threshold value is 0-15°C.

[0014] In one or more optional embodiments above, a first temperature sensing element is provided on one side of each first conductive sheet, and a first conductive sheet is connected to a first heating circuit.

[0015] In one or more of the above optional embodiments, the first temperature sensing element includes a thermistor, and the distance between the first temperature sensing element and the corresponding first conductive sheet is between 2 mm and 5 mm.

[0016] In one or more of the above optional embodiments, the first temperature sensing element is a negative temperature coefficient thermistor

[0017] In one or more optional embodiments above, between adjacent battery cells, the first conductive sheet, the first electrode terminal connected to the first conductive sheet, and the second electrode terminal are stacked and connected.

[0018] In one or more of the above optional embodiments, each battery cell includes two second electrode terminals, which are respectively located on the first side and the second side; the circuit assembly includes a second circuit board, the second circuit board includes a second substrate and a plurality of second conductive plates, and the plurality of second conductive plates are connected to the second substrate; between adjacent battery cells, a first electrode terminal and a second electrode terminal located on the first side are connected to the same first conductive plate, and a first electrode terminal and a second electrode terminal located on the second side are connected to the same second conductive plate, and the second conductive plates are connected to the second branches one by one; and adjacent second branches are disconnected.

[0019] In one or more optional embodiments above, the auxiliary circuit includes more than one second auxiliary branch, each second auxiliary branch is connected to more than two second branches, and the second branches connected to the same second auxiliary branch are not adjacent to each other. The second auxiliary branch is used to connect to an external power supply device.

[0020] In one or more optional embodiments above, between adjacent battery cells, the second conductive sheet, the first electrode terminal connected to the second conductive sheet, and the second electrode terminal are stacked and connected.

[0021] In one or more of the above optional embodiments, the first branch includes a circuit provided on a first circuit board, and the second branch includes a circuit provided on a second circuit board.

[0022] In one or more optional embodiments above, the first auxiliary branch includes a circuit provided on the first circuit board, and the circuit included in the first auxiliary branch is integrated on the first substrate.

[0023] In one or more optional embodiments above, the second auxiliary branch includes a circuit provided on the second circuit board, and the circuit included in the second auxiliary branch is integrated on the second substrate.

[0024] In one or more of the above optional embodiments, each battery cell includes two second electrode terminals, which are respectively located on the first side and the second side; the circuit assembly includes a second heating circuit, each second heating circuit includes a third branch and a fourth branch, a third branch is electrically connected to the second electrode terminal of a battery cell located on the first side, and a fourth branch is electrically connected to the second electrode terminal of a battery cell located on the second side.

[0025] In a second aspect, an embodiment of the present application provides another battery module, which includes a battery cell group and a circuit assembly, the battery cell group includes a plurality of battery cells arranged along a first direction, each battery cell includes a battery cell body and a plurality of electrode terminals extending from the battery cell body, the plurality of electrode terminals include two first electrode terminals and at least one second electrode terminal, the first electrode terminal and the second electrode terminal have opposite polarities, the battery cell group includes a first side and a second side opposite to each other along a second direction, the two first electrode terminals are located on the same side, the second electrode terminal and the first electrode terminal are located on different sides, and the first direction is perpendicular to the second direction; the circuit assembly includes a first heating circuit, each first heating circuit includes a first branch and a second branch, a first branch is electrically connected to a first electrode terminal of a battery cell, and a second branch is electrically connected to another first electrode terminal of the battery cell.

[0026] In a third aspect, an embodiment of the present application provides an energy storage device, which includes the above-mentioned battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application.

[0028] Figure 1 A partial structural schematic diagram of a battery module provided in some embodiments of the present application;

[0029] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of the A area in the middle;

[0030] Figure 3 A schematic structural diagram of a battery module portion of a structure from another perspective provided in some embodiments of the present application;

[0031] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of the middle B area;

[0032] Figure 5 A schematic diagram of the structure of a battery module provided in some embodiments of the present application;

[0033] Figure 6 One of the schematic diagrams of a portion of a first heating circuit provided in some embodiments of the present application;

[0034] Figure 7 One of the schematic diagrams of a portion of a first heating circuit provided in another embodiment of the present application;

[0035] Figure 8 One of the schematic diagrams of a part of the first heating circuit and the second heating circuit provided in another embodiment of the present application;

[0036] Fig. 9 One of the schematic diagrams of a part of the first heating circuit and the second heating circuit provided in another embodiment of the present application;

[0037] Fig.10 One of the schematic diagrams of a portion of a first heating circuit provided in another embodiment of the present application;

[0038] Fig.11 One of the schematic diagrams of a portion of a first heating circuit provided in another embodiment of the present application;

[0039] Fig.12 One of the schematic diagrams of a part of the first heating circuit and the second heating circuit provided in another embodiment of the present application;

[0040] Fig.13 One of the schematic diagrams of a part of the first heating circuit and the second heating circuit provided in another embodiment of the present application;

[0041] Fig.14 One of the schematic diagrams of a portion of a first heating circuit provided in another embodiment of the present application;

[0042] Fig.15 One of the schematic diagrams of a part of the first heating circuit and the second heating circuit provided in another embodiment of the present application;

[0043] Fig.16 A schematic diagram of the structure of a battery module provided in some other embodiments of the present application;

[0044] Fig.17 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application.

[0045] In the figure:

[0046] 11, battery cell; 11a, first electrode terminal; 11b, second electrode terminal; 11c, battery cell body; Y1, first side; Y2, second side; 12, end wall;

[0047] 21. first circuit board; 211. first substrate; 212. first conductive sheet; 22. battery management system module; 23. second circuit board; 231. second substrate; 232. second conductive sheet; 24. first heating circuit; 24a. first branch; 24b. second branch; 25. second heating circuit; 25a. third branch; 25b. fourth branch; 26. auxiliary circuit; 26a. first auxiliary branch; 26b. second auxiliary branch; 27. first temperature sensing element;

[0048] 3. Shell;

[0049] 4. External power supply equipment;

[0050] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0052] The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship. In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments.

[0053] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0054] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", etc. 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] In the embodiments of the present application, "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "perpendicular" also includes not only the absolutely perpendicular situation, but also the roughly perpendicular situation conventionally recognized in engineering. For example, if the angle between two directions is 80° to 90°, the two directions can be considered perpendicular; if the angle between two directions is 0° to 10°, the two directions can be considered parallel.

[0056] In order to solve the problems in the prior art, the present application provides a battery module and an energy storage device, which are described in detail below in conjunction with the accompanying drawings.

[0057] Figure 1 A partial structural schematic diagram of a battery module provided in some embodiments of the present application; Figure 2 for Figure 1 Schematic diagram of the enlarged structure of the A area in the middle; Figure 3 A schematic structural diagram of a battery module portion of a structure from another perspective provided in some embodiments of the present application; Figure 4 for Figure 3 Schematic diagram of the enlarged structure of the middle B area; Figure 6 One of the schematic diagrams of a portion of a first heating circuit provided in some embodiments of the present application; Figure 7 One of the schematic diagrams of a portion of a first heating circuit provided in another embodiment of the present application; Figure 8 One of the schematic diagrams of a part of the first heating circuit and the second heating circuit provided in another embodiment of the present application; Fig. 9 One of the schematic diagrams of a part of the first heating circuit and the second heating circuit provided in another embodiment of the present application; Fig.17 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application.

[0058] See also Figures 1 to 4 , Figures 6 to 9 ,and Fig.17 As shown, an embodiment of the present application provides a battery module, the battery module includes a cell group, the cell group includes a plurality of cell 11 arranged along a first direction X, each cell 11 includes a cell body 11c and a plurality of electrode terminals extending from the cell body 11c, the plurality of electrode terminals include two first electrode terminals 11a and at least one second electrode terminal 11b, the first electrode terminal 11a and the second electrode terminal 11b have opposite polarities, the cell group includes a first side Y1 and a second side Y2 opposite to each other along a second direction Y, the two first electrode terminals 11a are respectively located on the first side Y1 and the second side Y2, a second electrode terminal 11b and one of the first electrode terminals 11a are located on the same side, and the first direction X is perpendicular to the second direction Y.

[0059] In some embodiments, the battery cell 11 includes a soft-pack battery cell.

[0060] In some embodiments, the battery module includes a circuit assembly, the circuit assembly includes a first heating circuit 24, each first heating circuit 24 includes a first branch 24a and a second branch 24b, a first branch 24a is electrically connected to a first electrode terminal 11a of a battery cell 11 located on the first side Y1, and a second branch 24b is electrically connected to the first electrode terminal 11a of the battery cell 11 located on the second side Y2.

[0061] The two first electrode terminals 11a of the same battery cell are connected through the same electrode piece in the battery cell body 11c. The first branch 24a and the second branch 24b are used to connect the external power supply device 4. The external power supply device 4 forms a current in the corresponding electrode pieces in each battery cell body 11c through the first heating circuit 24. The electrode pieces in the battery cell body 11c have internal resistance. When the current passes through the electrode pieces in the battery cell body 11c, heat will be generated inside the battery cell body 11c to gradually increase the temperature of the battery cell and achieve heating of the battery cell. In addition, the number of first heating circuits 24 can be one or more; each first heating circuit 24 can include a first branch 24a and a second branch 24b, or can include multiple first branches 24a and multiple second branches 24b.

[0062] This solution generates heat by passing current through the pole piece inside the battery body 11c, which simplifies the internal structure of the battery module compared to setting up an additional independent heating element in the battery module. The two first electrode terminals 11a in this solution are respectively located on the first side Y1 and the second side Y2. During the heating process of the battery cell, the two first electrode terminals 11a are far apart, which can reduce the heat accumulation at the connection position of the two first electrode terminals 11a and the first heating circuit 24, and improve the accuracy of the temperature detection of the battery body 11c by the temperature sensing element near the first electrode terminal 11a.

[0063] During normal charging and discharging of the battery module, the cells in the battery module need to be connected in series or in parallel, and the two first electrode terminals 11a can shunt the current flowing into or out of the cell body 11c, thereby reducing heat generation and improving battery safety. The same cell has two first electrode terminals 11a, which can also relatively reduce the overall internal resistance of the cell during normal charging and discharging of the battery module, thereby reducing heat generation and further improving battery safety.

[0064] In some embodiments, the external power supply device 4 provides a 24V DC power to the first branch 24a and the second branch 24b, and the current passing through each first electrode terminal 11a is less than or equal to 5A, so that the battery cell can be slowly heated.

[0065] like Fig.17 As shown, Fig.17A schematic diagram of a structure in which multiple electrode terminals are not bent. In some embodiments, each battery cell includes two first electrode terminals 11a and two second electrode terminals 11b, the polarity of the first electrode terminal 11a is positive, and the polarity of the second electrode terminal 11b is negative, and the first branch 24a and the second branch 24b are used to connect to the external power supply device 4, so that the current provided by the external power supply device 4 passes through the first electrode terminal 11a with a positive polarity and flows through the corresponding electrode sheet, thereby generating heat and gradually increasing the temperature of the battery cell to achieve preheating of the battery cell.

[0066] like Figure 6 As shown, in some embodiments, the number of the second electrode terminals 11b is one, the polarity of the first electrode terminal 11a is positive, and the polarity of the second electrode terminal 11b is negative. The first branch 24a and the second branch 24b are used to connect the external power supply device 4 so that the current provided by the external power supply device 4 passes through the first electrode terminal 11a with positive polarity and flows through the corresponding electrode piece, thereby generating heat and gradually increasing the temperature of the battery cell to achieve preheating of the battery cell.

[0067] like Figure 7 As shown, in some embodiments, the number of second electrode terminals 11b is one, the polarity of the second electrode terminal 11b is positive, the polarity of the first electrode terminal 11a is negative, and the first branch 24a and the second branch 24b are used to connect the external power supply device 4 so that the current provided by the external power supply device 4 passes through the first electrode terminal 11a with negative polarity and flows through the corresponding electrode piece, thereby generating heat and gradually increasing the temperature of the battery cell to achieve preheating of the battery cell.

[0068] In some embodiments, a heat insulator is provided between adjacent battery cells, and the thermal conductivity of the heat insulator at 25° C. is less than 1 W / (m·K) to reduce the thermal impact between adjacent battery cells. The heat insulator may be a heat insulating material such as foam or aerogel.

[0069] like Figure 1 and Figure 4 As shown, in some embodiments, end walls 12 are installed on both sides of the battery cell group along the first direction X. The end walls 12 are in a grid structure and can protect the battery cells.

[0070] like Figures 1 to 4 As shown, in some embodiments, the second direction Y is perpendicular to the first direction X, and the thickness of the battery cell group along the first direction X can be relatively reduced.

[0071] Figure 5 A schematic diagram of the structure of a battery module provided in some embodiments of the present application.

[0072] like Figure 5As shown, the battery module includes a shell 3, and the battery cell group and the circuit assembly are accommodated in the shell 3 to protect the battery cell group and the circuit assembly.

[0073] Fig.10 One of the schematic diagrams of a portion of the first heating circuit 24 provided in another embodiment of the present application; Fig.11 This is one of the schematic diagrams of a portion of the first heating circuit 24 provided in another embodiment of the present application.

[0074] like Figure 1 , Figure 2 , Fig.10 and Fig.11 As shown, in some embodiments, the circuit component includes a first circuit board 21, the first circuit board 21 includes a first substrate 211 and a plurality of first conductive sheets 212, the plurality of first conductive sheets 212 are connected to the first substrate 211, and one first conductive sheet 212 is electrically connected to a first branch 24a; on the same side of adjacent battery cells 11, the first electrode terminal 11a of one battery cell 11 and the second electrode terminal 11b of another battery cell 11 are connected to the same first conductive sheet 212, and adjacent battery cells 11 are connected in series; and adjacent first branches 24a are disconnected.

[0075] In the process of producing the first circuit board 21, the plurality of first conductive sheets 212 are pre-assembled to the first substrate 211, which can improve the overall assembly efficiency of the battery cell group and the plurality of first conductive sheets 212. During the charging and discharging process of the battery module, the first conductive sheet 212 can collect parameters such as the voltage and current of the corresponding electrode terminals to monitor the battery module and improve the safety of the battery module.

[0076] In some embodiments, the first circuit board 21 includes a printed circuit board (PCB), and in other embodiments, the first circuit board 21 includes a flexible printed circuit (FPC).

[0077] like Fig.11 As shown, in some embodiments, the first heating circuit 24 includes an auxiliary circuit 26, and the auxiliary circuit 26 includes more than one first auxiliary branch 26a, each first auxiliary branch 26a is connected to more than two first branches 24a, and the first branches 24a connected to the same first auxiliary branch 26a are not adjacent to each other. The first auxiliary branch 26a is used to connect to the external power supply device 4, that is, multiple first branches 24a can be connected to the external power supply device 4 through one first auxiliary branch 26a, thereby simplifying the complexity of the first heating circuit 24.

[0078] like Figure 1As shown, in some embodiments, the circuit assembly includes a battery management system module 22, and the battery management system module 22 includes a circuit board and electronic components arranged on the circuit board. The battery management system module 22 is connected to the first circuit board 21, and the first branch 24a and the second branch 24b are electrically connected to the battery management system module 22 respectively. The battery management system module 22 is configured to control the disconnection and conduction of the first heating circuit 24. The battery management system module 22 can control the disconnection and conduction between the first heating circuit 24 and the external power supply device 4, and then control the preheating state of the battery cell; during the charging and discharging process of the battery module, the battery management system module 22 can receive the electrical signal collected by the first conductive sheet 212 to realize the monitoring of the battery module and improve the safety of the battery module.

[0079] like Figure 1 and Figure 2 As shown, in some embodiments, the circuit component includes a plurality of first temperature sensing elements 27 disposed on the first circuit board 21, the first temperature sensing elements 27 measure the temperature of the first conductive sheet 212, the first temperature sensing elements 27 are electrically connected to the battery management system module 22, and transmit signals to the battery management system module 22.

[0080] The battery management system module 22 is configured to adjust the corresponding first heating circuit 24 to be disconnected when the circuit component is in a heating state and the temperature measured by the first temperature sensing element 27 is greater than or equal to a first threshold value, and the range of the first threshold value is 0-15°C. The first temperature sensing element 27 can detect the temperature of the battery cell in the heating state, and can also detect the temperature of the battery cell during normal charging and discharging. The first heating circuit 24 corresponding to the first temperature sensing element 27 refers to the first heating circuit 24 connected to the battery cell corresponding to the first conductive sheet 212 in the temperature measurement area of ​​the first temperature sensing element 27. The battery management system module 22 can combine factors such as the thermal conductivity efficiency of the electrode terminal and the thermal conductivity efficiency of the first conductive sheet 212. The battery management system module 22 can control the on and off of the corresponding first heating circuit 24 according to the battery cell temperature to adjust the heating state of the corresponding battery cell, thereby reducing the heating temperature difference between the battery cells.

[0081] In some embodiments, the first threshold is 10 degrees Celsius.

[0082] like Figure 2 As shown, in some embodiments, a first temperature sensing element 27 is provided on one side of each first conductive sheet 212, and a first conductive sheet 212 is connected to a first heating circuit 24. The first temperature sensing element 27, the first conductive sheet 212 and the first heating circuit 24 are arranged in a one-to-one correspondence, so that the battery management system module 22 controls the on and off of the corresponding first heating circuit 24 of each battery cell 11 to adjust the heating state of the corresponding battery cell 11 and further reduce the heating temperature difference between the battery cells 11.

[0083] In some embodiments, the first temperature sensing element 27 includes a thermistor, and the distance between the first temperature sensing element 27 and the corresponding first conductive sheet 212 is between 2 mm and 5 mm, which is conducive to improving the thermistor to measure the temperature change of the corresponding first conductive sheet 212. The thermistor and the corresponding first conductive sheet 212 can be arranged along the first direction X, along the second direction Y, or along the third direction Z. Specifically, Figure 2 As shown, in this embodiment, the thermistor and the corresponding first conductive sheet 212 are arranged along the first direction X, which can relatively reduce the overall size of the first circuit board 21 along the second direction Y and the third direction Z; the distance between the thermistor and the corresponding first conductive sheet 212 refers to the spacing between the thermistor and the corresponding first conductive sheet 212 along the first direction X.

[0084] In some embodiments, the first temperature sensing element 27 is a negative temperature coefficient thermistor (NTC, Negative Temperature Coefficient).

[0085] like Figure 1 and Figure 2 As shown, in some embodiments, between adjacent battery cells, the first conductive sheet 212, the first electrode terminal 11a connected to the first conductive sheet 212, and the second electrode terminal 11b are stacked and connected. The first conductive sheet 212 and the corresponding first electrode terminal 11a and second electrode terminal 11b are stacked and connected, which can increase the contact area between adjacent components, thereby reducing the resistance at the connection position of adjacent components, reducing heat generation, and improving the safety of the battery.

[0086] Fig.12 One of the schematic diagrams of a part of the first heating circuit 24 and the second heating circuit 25 provided in another embodiment of the present application; Fig.13 This is one of the schematic diagrams of a portion of the first heating circuit 24 and the second heating circuit 25 provided in another embodiment of the present application.

[0087] like Figures 1 to 4 , Fig.12 and Fig.13 ,and Fig.17 As shown, in some embodiments, each battery cell 11 includes two second electrode terminals 11b, the two second electrode terminals 11b are respectively located on the first side Y1 and the second side Y2, and one first electrode terminal 11a and one second electrode terminal 11b are located on the same side.

[0088] The circuit assembly includes a second circuit board 23, and the second circuit board 23 includes a second substrate 231 and a plurality of second conductive sheets 232, and the plurality of second conductive sheets 232 are connected to the second substrate 231. Between adjacent battery cells 11, a first electrode terminal 11a and a second electrode terminal 11b located on the first side Y1 are connected to the same first conductive sheet 212, and a first electrode terminal 11a and a second electrode terminal 11b located on the second side Y2 are connected to the same second conductive sheet 232, and the second conductive sheet 232 is connected to the second branch 24b in a one-to-one correspondence, and adjacent battery cells 11 are connected in series. Adjacent second branches 24b are disconnected.

[0089] In some embodiments, the second circuit board 23 includes a printed circuit board (PCB), and in other embodiments, the second circuit board 23 includes a flexible printed circuit (FPC).

[0090] like Fig.13 As shown, in some embodiments, the auxiliary circuit 26 includes more than one second auxiliary branch 26b, each second auxiliary branch 26b is connected to more than two second branches 24b, and the second branches 24b connected to the same second auxiliary branch 26b are not adjacent to each other. The second auxiliary branch 26b is used to connect to the external power supply device 4, that is, multiple second branches 24b can be connected to the external power supply device 4 through one second auxiliary branch 26b, thereby simplifying the complexity of the first heating circuit 24.

[0091] In some embodiments, between adjacent battery cells, the second conductive sheet 232, the first electrode terminal 11a and the second electrode terminal 11b connected to the second conductive sheet 232 are stacked and connected. The second conductive sheet 232 and the corresponding first electrode terminal 11a and second electrode terminal 11b are stacked and connected, which can increase the contact area between adjacent components, thereby reducing the resistance at the connection position of adjacent components, reducing heat generation, and improving the safety of the battery.

[0092] In some embodiments, a second temperature sensing element (not shown) is provided on one side of each second conductive sheet 232, and a second conductive sheet 232 is connected to a first heating circuit 24. The second temperature sensing element, the second conductive sheet 232 and the first heating circuit 24 are arranged in a one-to-one correspondence, so that the battery management system module 22 controls the on and off of the corresponding first heating circuit 24 of each battery cell 11 to adjust the heating state of the corresponding battery cell 11 and further reduce the heating temperature difference between the battery cells 11.

[0093] like Figures 1 to 4As shown, in some embodiments, two electrode terminals of the same battery cell located on the first side Y1 are spaced apart along the third direction Z, and two electrode terminals of the same battery cell located on the second side Y2 are spaced apart along the third direction Z. The third direction Z, the second direction Y and the first direction X are perpendicular to each other, which can relatively improve the heat dissipation efficiency of each electrode terminal and reduce the risk of heat accumulation at adjacent electrode terminals.

[0094] like Figures 1 to 3 As shown, in some embodiments, the first branch 24a includes a circuit provided on the first circuit board 21, and the second branch 24b includes a circuit provided on the second circuit board 23. The circuit included in the first branch 24a is integrated on the first substrate 211, and the circuit included in the second branch 24b is integrated on the second substrate 231.

[0095] like Figures 1 to 3 As shown, in some embodiments, the first auxiliary branch 26 a includes a circuit disposed on the first circuit board 21 , and the circuit included in the first auxiliary branch 26 a is integrated on the first substrate 211 .

[0096] In some embodiments, the second auxiliary branch 26 b includes a circuit disposed on the second circuit board 23 , and the circuit included in the second auxiliary branch 26 b is integrated on the second substrate 231 .

[0097] like Figure 8 and Fig. 9 As shown, in some embodiments, each battery cell includes two second electrode terminals 11b, and the two second electrode terminals 11b are respectively located on the first side Y1 and the second side Y2. The circuit assembly includes a second heating circuit 25, and each second heating circuit 25 includes a third branch 25a and a fourth branch 25b. One third branch 25a is electrically connected to the second electrode terminal 11b of a battery cell located on the first side Y1, and one fourth branch 25b is electrically connected to the second electrode terminal 11b of a battery cell located on the second side Y2. The third branch 25a and the fourth branch 25b are used to connect to the external power supply device 4. The external power supply device 4 forms a current in the corresponding electrode pieces in each battery cell body 11c through the second heating circuit 25. The electrode pieces in the battery cell body 11c have internal resistance. When the current passes through the electrode pieces in the battery cell body 11c, heat will be generated inside the battery cell body 11c to gradually increase the temperature of the battery cell and realize preheating of the battery cell. By setting up the second heating circuit 25, the heating efficiency of each battery cell can be improved during the preheating process; during the normal charging and discharging process of the battery module, the two second electrode terminals 11b can reduce heat generation and improve battery safety by dispersing current and relatively reducing the overall internal resistance of the battery cell.

[0098] like Figure 8As shown, in some embodiments, each first branch 24a, each second branch 24b, each third branch 25a and each fourth branch 25b are respectively connected to a corresponding external power supply device 4 to pass current to the corresponding electrode to achieve heating of the battery cell.

[0099] like Fig. 9 As shown, in some embodiments, each first branch 24a is simultaneously connected to the external power supply device 4, each second branch 24b is simultaneously connected to the external power supply device 4, each third branch 25a is simultaneously connected to the external power supply device 4, and each fourth branch 25b is simultaneously connected to the external power supply device 4, which can simplify the circuit structure and relatively reduce the wiring difficulty.

[0100] Fig.14 This is one of the schematic diagrams of a portion of the first heating circuit 24 provided in another embodiment of the present application.

[0101] like Fig.14 As shown, an embodiment of the present application provides another battery module, including a cell group and a circuit assembly, the cell group including a plurality of cells arranged along a first direction X, each cell including a cell body 11c and a plurality of electrode terminals extending from the cell body 11c, the plurality of electrode terminals including two first electrode terminals 11a and at least one second electrode terminal 11b, the first electrode terminal 11a and the second electrode terminal 11b having opposite polarities, the cell group including a first side Y1 and a second side Y2 opposite to each other along a second direction Y, the two first electrode terminals 11a being located on the same side, the second electrode terminal 11b and the first electrode terminal 11a being located on different sides, and the first direction X being perpendicular to the second direction Y; the circuit assembly including a first heating circuit 24, each first heating circuit 24 including a first branch 24a and a second branch 24b, a first branch 24a being electrically connected to a first electrode terminal 11a of a cell, and a second branch 24b being electrically connected to another first electrode terminal 11a of the cell.

[0102] This solution generates heat by passing current through the pole piece inside the battery body 11c, which simplifies the internal structure of the battery module compared to setting up an additional independent heating element in the battery module. During the normal charging and discharging process of the battery module, the battery cells in the battery module need to be connected in series or in parallel. The two first electrode terminals 11a can shunt the current flowing into or out of the battery body 11c, thereby reducing heat and improving the safety of the battery; the same battery cell has two first electrode terminals 11a, which can also relatively reduce the overall internal resistance of the battery cell during the normal charging and discharging process of the battery module, thereby reducing heat and further improving the safety of the battery.

[0103] Fig.15 This is one of the schematic diagrams of a portion of the first heating circuit 24 and the second heating circuit 25 provided in another embodiment of the present application.

[0104] like Fig.15 As shown, each battery cell includes two second electrode terminals 11b, and the two second electrode terminals 11b are located on the second side Y2. The circuit assembly includes a second heating circuit 25, and each battery cell is connected to the corresponding second heating circuit 25. Each second heating circuit 25 includes a third branch 25a and a fourth branch 25b. The third branch 25a is connected to one second electrode terminal 11b of the corresponding battery cell, and the fourth branch 25b is connected to another second electrode terminal 11b of the corresponding battery cell. By setting the second heating circuit 25, the heating efficiency of each battery cell can be improved during the preheating process; during the normal charging and discharging process of the battery module, the two second electrode terminals 11b can reduce heat generation and improve the safety of the battery by dispersing the current and relatively reducing the overall internal resistance of the battery cell.

[0105] Fig.16 A schematic diagram of the structure of a battery module provided in some other embodiments of the present application.

[0106] like Fig.16 As shown, in some embodiments, the present application provides an energy storage device, including the battery module in the above embodiment. Since the energy storage device includes the battery module in the above embodiment, it has at least all the beneficial effects brought by the above embodiment, which will not be repeated here.

[0107] In some embodiments, the energy storage device includes a conductive member, and the battery module is provided with more than one, and the battery modules are all connected to the conductive member, and the conductive member is used to connect to the external power supply device 4 to achieve heating of each battery module. In other embodiments, the battery module can be heated by the electric energy of the battery cell 11.

[0108] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A battery module, characterized in that: include: A cell group, comprising a plurality of cells arranged along a first direction, each of the cells comprising a cell body and a plurality of electrode terminals extending from the cell body, the plurality of electrode terminals comprising two first electrode terminals and at least one second electrode terminal, the first electrode terminal and the second electrode terminal having opposite polarities, the cell group comprising a first side and a second side opposite to each other along a second direction, two of the first electrode terminals being located on the first side and the second side, one of the second electrode terminals and one of the first electrode terminals being located on the same side, and the first direction being perpendicular to the second direction; The circuit assembly includes a first heating circuit, each of the first heating circuits includes a first branch and a second branch, one of the first branches is electrically connected to a first electrode terminal of a battery cell located on the first side, and one of the second branches is electrically connected to the first electrode terminal of the battery cell located on the second side.

2. The battery module according to claim 1, characterized in that: The circuit assembly includes a first circuit board, the first circuit board includes a first substrate and a plurality of first conductive sheets, the plurality of first conductive sheets are connected to the first substrate, and one first conductive sheet is electrically connected to one first branch; On the same side of the adjacent battery cells, the first electrode terminal of one battery cell and the second electrode terminal of another battery cell are connected to the same first conductive sheet; The adjacent first branch is disconnected.

3. The battery module according to claim 2, characterized in that: The circuit assembly comprises: A battery management system module is connected to the first circuit board, the first branch and the second branch are electrically connected to the battery management system module respectively, and the battery management system module is configured to control the first heating circuit to be disconnected and turned on.

4. The battery module according to claim 3, characterized in that: The circuit assembly comprises: a plurality of first temperature sensing elements disposed on the first circuit board, the first temperature sensing elements measuring the temperature of the first conductive sheet, the first temperature sensing elements being electrically connected to the battery management system module and transmitting signals to the battery management system module; The battery management system module is configured to adjust the corresponding first heating circuit to be open circuit when the circuit component is in a heating state and the temperature measured by the first temperature sensing element is greater than or equal to a first threshold, and the range of the first threshold is 0-15°C.

5. The battery module according to claim 4, characterized in that: A first temperature sensing element is disposed on one side of each of the first conductive sheets, and one of the first conductive sheets is connected to one of the first heating circuits.

6. The battery module according to claim 4 or 5, characterized in that: The first temperature sensing element comprises a thermistor, and a distance between the first temperature sensing element and the corresponding first conductive sheet is between 2 mm and 5 mm.

7. The battery module according to any one of claims 2 to 6, characterized in that: The first conductive sheet, the first electrode terminal connected to the first conductive sheet, and the second electrode terminal are stacked and connected between adjacent battery cells.

8. The battery module according to any one of claims 2 to 7, characterized in that: Each of the battery cells comprises two second electrode terminals, and the two second electrode terminals are respectively located on the first side and the second side; The circuit assembly includes a second circuit board, the second circuit board includes a second substrate and a plurality of second conductive sheets, and the plurality of second conductive sheets are connected to the second substrate; Between adjacent battery cells, one of the first electrode terminals and one of the second electrode terminals located on the first side are connected to the same first conductive sheet, one of the first electrode terminals and one of the second electrode terminals located on the second side are connected to the same second conductive sheet, and the second conductive sheet is connected to the second branch in a one-to-one correspondence; The adjacent second branch is disconnected.

9. The battery module according to claim 8, characterized in that: The first branch includes a circuit disposed on a first circuit board, and the second branch includes a circuit disposed on a second circuit board.

10. The battery module according to claim 1, characterized in that: Each of the battery cells comprises two second electrode terminals, and the two second electrode terminals are respectively located on the first side and the second side; The circuit assembly includes a second heating circuit, each of the second heating circuits includes a third branch and a fourth branch, one of the third branches is electrically connected to a second electrode terminal of a battery cell located on the first side, and one of the fourth branches is electrically connected to a second electrode terminal of a battery cell located on the second side.

11. A battery module, characterized in that: include: A cell group, comprising a plurality of cells arranged along a first direction, each of the cells comprising a cell body and a plurality of electrode terminals extending from the cell body, the plurality of electrode terminals comprising two first electrode terminals and at least one second electrode terminal, the first electrode terminal and the second electrode terminal having opposite polarities, the cell group comprising a first side and a second side opposite to each other along a second direction, the two first electrode terminals being located on the same side, the second electrode terminal and the first electrode terminal being located on different sides, and the first direction being perpendicular to the second direction; The circuit assembly includes a first heating circuit, each of the first heating circuits includes a first branch and a second branch, one of the first branches is electrically connected to one of the first electrode terminals of a battery cell, and one of the second branches is electrically connected to another of the first electrode terminals of the battery cell.

12. An energy storage device, characterized in that: A battery module comprising any one of claims 1 to 11.

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