Battery module and battery system

Abstract

The invention provides a battery module and a battery system. The battery module is used for being stacked with another battery module. The battery module comprises a shell, a common busbar, a positive electrode connector, a top column and a mechanical switch. The common busbar, the positive electrode connector, the negative electrode connector, the top column and the mechanical switch are all arranged in the shell. Wherein when the battery module is stacked with another battery module, the second end of the common busbar of the battery module is connected with the first end of the common busbar of another battery module, the cathode connector of the battery module is connected with the anode connector of another battery module, and the mechanical switch of the battery module is disconnected by the support pillar of another battery module. Through the arrangement of the common busbar, the positive electrode connector, the negative electrode connector, the top column and the mechanical switch, electrical connection can be automatically realized during stacking, the requirement of external wiring is reduced, the flexibility is improved, and the cost is reduced.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of electronic circuits, and particularly to a battery module and a battery system. Background Art

[0002] A conventional battery stacking system includes 1 control module, several battery modules and 1 base. Among them, the control module is equipped with a BMS (Battery Management System) and corresponding switches. The battery module contains battery cells and corresponding control systems. The battery module has positive and negative connectors and a total negative connector on the outside. The base contains a structure capable of short-circuiting the total negative connector and the negative connector of the battery module.

[0003] This solution must use a base to form a complete system. From the perspective of structural cost, the base needs to have a firm structure to bear the weight of all battery packs, and connectors for docking with the module, which requires high material selection and processing technology, driving up the production cost. From the perspective of maintenance, the presence of the base increases the system complexity. Once problems occur in the base, such as poor contact of connectors, structural damage, etc., not only is it difficult to troubleshoot faults, but also it is more cumbersome to replace the base, which will prolong the maintenance time and increase the maintenance cost. Summary of the Invention

[0004] The embodiments of the present application provide a battery module and a battery system, which can eliminate the base when the battery modules are stacked, so as to improve flexibility and reduce costs.

[0005] In a first aspect, the embodiments of the present application provide a battery module, which is used to be stacked with another battery module. The battery module includes: a housing; a common busbar, the common busbar is arranged in the housing, the first end of the common busbar is exposed on the first side of the housing, and the second end of the common busbar is exposed on the second side of the housing; a positive connector, the positive connector is arranged in the housing, the positive connector is exposed on the first side of the housing, and the positive connector is used to connect the positive electrode of the battery pack; a negative connector, the negative connector is arranged in the housing, the negative connector is exposed on the second side of the housing, and the negative connector is used to connect the negative electrode of the battery pack; a top post, the top post is arranged in the housing, and the top post protrudes from the first side of the housing; a mechanical switch, the mechanical switch is arranged on the second side in the housing, and the mechanical switch connects the common busbar and the negative connector; wherein, when the battery module is stacked with another battery module, the second end of the common busbar of the battery module is connected to the first end of the common busbar of another battery module, the negative connector of the battery module is connected to the positive connector of another battery module, and the mechanical switch of the battery module is disconnected by the top post of another battery module.

[0006] In some embodiments, the first side of the housing is disposed opposite to the second side of the housing.

[0007] In some embodiments, the mechanical switch includes: a first stationary contact connected to the common busbar; a second stationary contact connected to the negative connector; a moving contact that abuts against the first stationary contact and the second stationary contact; the moving contact is configured to be pushed by the top post of another battery module when the battery module is stacked with another battery module, so as to disconnect the connection between the moving contact and the first stationary contact and / or the connection between the moving contact and the second stationary contact.

[0008] In some embodiments, the mechanical switch further includes: a central post connected to the moving contact, and the central post is disposed between the first stationary contact and the second stationary contact; the central post is configured to be pushed by the top post of another battery module when the battery module is stacked with another battery module, so as to disconnect the connection between the moving contact and the first stationary contact and / or the connection between the moving contact and the second stationary contact.

[0009] In some embodiments, the first surface of the top post is opposite to the central post, the second surface of the central post is opposite to the top post, the first surface of the positive connector is opposite to the negative connector, and the second surface of the negative connector is opposite to the positive connector; wherein, the distance between the first surface of the top post and the second surface of the central post is greater than the distance between the first surface of the positive connector and the second surface of the negative connector.

[0010] In some embodiments, the battery module further includes: a connection detection module disposed in the housing, a first end of the connection detection module is exposed on the first side of the housing, and the connection detection module is connected to the negative connector; the connection detection module is configured to output a connection detection signal during the process of connecting the second side of the battery module to the first side of another battery module and during the process of disconnecting the second side of the battery module from the first side of another battery module.

[0011] In some embodiments, the connection detection module includes: a first signal connector disposed on the housing, the first signal connector being exposed on a first side of the housing and configured to connect to a control module; a second signal connector disposed on the housing, the second signal connector connecting to the first signal connector; a diode D1, a positive electrode of the diode D1 being connected to a connection point between the first signal connector and the second signal connector, and a negative electrode of the diode D1 being connected to a negative electrode connector of the battery module; wherein when the battery module is stacked with another battery module, the second signal connector of the battery module connects to the first signal connector of the other battery module.

[0012] In some embodiments, a first surface of the first signal connector faces away from the second signal connector, and a second surface of the second signal connector faces away from the first signal connector; wherein a distance between the first surface of the first signal connector and the second surface of the second signal connector is less than a distance between a first surface of the positive electrode connector and a second surface of the negative electrode connector.

[0013] In a second aspect, an embodiment of the present application provides a battery system, the battery system including: at least two battery modules as described above, the at least two battery modules being stacked.

[0014] In some embodiments, the battery system further includes: a control module stacked with the at least two battery modules; the control module is configured to receive a connection detection signal output by the battery module to determine a connection state of the at least two battery modules.

[0015] Distinct from the prior art solutions, the embodiments of the present application provide a battery module and a battery system. The battery module is used to stack with another battery module. The battery module includes a housing, a common busbar, a positive connector, a negative connector, a top post, and a mechanical switch. In traditional battery module series connections, complex external wiring or bases are required. However, with the settings of the common busbar, positive connector, negative connector, top post, and mechanical switch in this battery module, electrical connection can be automatically achieved during stacking, reducing the need for external wiring and lowering the complexity and cost of connection. By utilizing the cooperation of the top post and the mechanical switch, series connection and switching state switching can be automatically achieved when the battery modules are stacked, eliminating the need for manual intervention for complex circuit connection and switch operation, and improving the convenience and reliability of battery module series connection. The design of the mechanical switch enables it to be in a closed state when the battery module is not stacked and automatically open when stacked, reducing safety issues such as short circuits that may occur during the series connection process and improving the safety of the battery module during the series connection process. Multiple battery modules can be conveniently stacked in series, and users can flexibly increase or decrease the number of battery modules according to actual voltage requirements to achieve flexible adjustment of the battery pack voltage, with good scalability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations do not limit the embodiments. Elements with the same reference numerals in the drawings represent similar elements, unless otherwise stated, and the drawings in the figures do not constitute a scale limitation.

[0017] Figure 1 is a schematic structural diagram of a battery module provided by an embodiment of the present application; Figure 2 is a schematic structural diagram of another battery module provided by an embodiment of the present application; Figure 3 is a schematic structural diagram of yet another battery module provided by an embodiment of the present application; Figure 4 is a schematic diagram of three distances in the battery module provided by an embodiment of the present application; Figure 5 is a schematic structural diagram of a battery system provided by an embodiment of the present application; Figure 6 is a schematic structural diagram of another battery system provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and detailedly describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0019] The technical features involved in the various embodiments of this application described below do not conflict with each other and can be combined with each other.

[0020] When an element is expressed as "connected" to another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween.

[0021] The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same type and do not limit the number of objects. For example, the first object can be one or multiple.

[0022] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a battery module 100 provided by an embodiment of this application.

[0023] An embodiment of this application provides a battery module 100. The battery module 100 is used to stack with another battery module ( Figure 1 not shown), and the battery module 100 includes a housing 11, a common busbar 21, a positive connector 31, a negative connector 41, a top post 51, and a mechanical switch 61.

[0024] Among them, the common busbar 21 is disposed in the housing 11. The first end of the common busbar 21 is exposed on the first side of the housing 11, and the second end of the common busbar 21 is exposed on the second side of the housing 11. The positive connector 31 is disposed in the housing 11, and the positive connector 31 is exposed on the first side of the housing 11. The positive connector 31 is used to connect the positive electrode of the battery pack 71. The negative connector 41 is disposed in the housing 11, and the negative connector 41 is exposed on the second side of the housing 11. The negative connector 41 is used to connect the negative electrode of the battery pack 71. The top post 51 is disposed in the housing 11, and the top post 51 protrudes from the first side of the housing 11. The mechanical switch 61 is disposed on the second side inside the housing 11, and the mechanical switch 61 connects the common busbar 21 and the negative connector 41.

[0025] Among them, when the battery module 100 stacks with another battery module ( Figure 1When stacking (not shown), the second end of the common busbar 21 of the battery module 100 is connected to the first end of the common busbar of another battery module ( Figure 1 not shown), the negative connector 41 of the battery module 100 is connected to the positive connector of another battery module ( Figure 1 not shown), and the mechanical switch 61 of the battery module 100 is disconnected by the top post of another battery module ( Figure 1 not shown).

[0026] In addition, the battery pack 71 can be a component of the battery module 100 or a component provided independently of the battery module 100, which is specifically set according to requirements.

[0027] In practical applications, the battery module 100 has two working states, one is the single battery module state, and the other is the state of multiple battery modules stacked together.

[0028] When the battery module 100 is in the single battery module state: When the battery module 100 is not stacked with other battery modules, the mechanical switch 61 is in the closed state. At this time, the common busbar 21 is connected to the negative connector 41 through the mechanical switch 61. The positive connector 31 of the battery module 100 is connected to the positive pole of the battery pack 71, and the negative connector 41 is connected to the negative pole of the battery pack 71, forming a complete battery power supply loop. The battery module 100 can work normally and provide electrical energy for the load (not shown in the figure).

[0029] When the battery module 100 is in the state of multiple battery modules stacked together: When the battery module 100 is stacked with another battery module, the second end of the common busbar 21 of the battery module 100 is connected to the first end of the common busbar of another battery module ( Figure 1 not shown), realizing the series connection of the common busbars; at the same time, the negative connector 41 of the battery module 100 is connected to the positive connector of another battery module ( Figure 1 not shown). The top post of another battery module ( Figure 1 not shown) will squeeze the mechanical switch 61 of the battery module 100 to disconnect the mechanical switch 61. This action changes the internal circuit connection state of the battery module 100, so that multiple stacked battery modules are connected in series. As the number of series-connected battery modules increases, the voltage of the entire battery pack also increases accordingly to meet the application scenarios with higher voltage requirements.

[0030] In this embodiment, an example is given for stacking another battery module below the battery module 100. The principle of stacking another battery module above the battery module 100 is similar and will not be elaborated here.

[0031] In some embodiments, the first side of the housing 11 is disposed opposite to the second side of the housing 11.

[0032] Among them, the housings 11 in the drawings are all rectangular parallelepipeds, and the drawings are cross-sections of the housing 11. The upper side of the housing 11 in the drawings is its first side, and the lower side of the housing 11 is its second side. The upper ends of the respective components in the drawings are their first ends, and the lower ends of the respective components are their second ends.

[0033] It should be noted that the housing 11 can be set as a cube, a cylinder, etc. according to actual needs.

[0034] In some other embodiments, the first side of the housing 11 and the second side of the housing 11 can be vertically arranged or arranged at other angles, specifically set according to actual needs.

[0035] Please refer to Figure 2 , Figure 2 which is a schematic structural diagram of another battery module 100 provided by an embodiment of the present application.

[0036] In some embodiments, as Figure 2 shown, the battery module 100 further includes a connection detection module 81. Among them, the connection detection module 81 is provided in the housing 11, the first end of the connection detection module 81 is exposed on the first side of the housing 11, and the connection detection module 81 is connected to the negative electrode connector 41.

[0037] Specifically, the connection detection module 81 is used to output a connection detection signal during the process of connecting the second side of the battery module 100 to the first side of another battery module ( Figure 2 not shown), and during the process of disconnecting the second side of the battery module 100 from the first side of another battery module ( Figure 2 not shown).

[0038] In practical applications, when the second side of the battery module 100 approaches and starts to connect to the first side of another battery module, the connection detection module 81 will sense a physical proximity or contact change. Since one end of the connection detection module 81 is exposed on the first side of the housing 11 and the other end is connected to the negative electrode connector 41, this physical change will cause the circuit state inside the connection detection module 81 to change, for example, triggering the internal switch element to conduct or changing the parameters of elements such as resistors and capacitors, thereby generating an electrical signal change, and this changed electrical signal is output as a connection detection signal to indicate that the two battery modules are performing a connection operation.

[0039] When the second side of the battery module 100 is disconnected from the first side of another battery module, the connection detection module 81 will also sense this physical separation change, thereby causing the internal circuit state to change again, resulting in a change in the electrical signal, and outputting the connection detection signal again to indicate that the two battery modules are performing a disconnection operation.

[0040] Please refer to Figure 3 , Figure 3 which is another schematic structural diagram of the battery module 100 provided by the embodiments of the present application.

[0041] In some embodiments, as Figure 3 shown, the mechanical switch 61 includes a first stationary contact 611, a second stationary contact 612, and a moving contact 613. Among them, the first stationary contact 611 is connected to the common busbar 21. The second stationary contact 612 is connected to the negative connector 41. The moving contact 613 abuts against the first stationary contact 611 and the second stationary contact 612.

[0042] Specifically, the moving contact 612 is used to be pushed by the top post ( Figure 3 not shown) of another battery module when the battery module 100 is stacked with another battery module ( Figure 3 not shown), so as to disconnect the connection between the moving contact 613 and the first stationary contact 611 and / or the connection between the moving contact 613 and the second stationary contact 612.

[0043] Among them, the first stationary contact 611, the second stationary contact 612, and the moving contact 613 are all made of conductive metal materials.

[0044] In practical applications, when the battery module 100 is stacked with another battery module, the top post of the other battery module will contact the mechanical switch 61. Specifically, the top post of the other battery module pushes the moving contact 613, so that the connection between the moving contact 613 and the first stationary contact 611 and / or the connection between the moving contact 613 and the second stationary contact 612 are disconnected. In this way, the electrical connection between the common busbar 21 and the negative connector 41 in the battery module 100 is cut off.

[0045] In some embodiments, as Figure 3 shown, the mechanical switch 61 further includes a central post 614. Among them, the central post 614 is connected to the moving contact 613, and the central post 614 is arranged between the first stationary contact 611 and the second stationary contact 612.

[0046] Specifically, the central post 614 is used to be pushed by the top post ( Figure 3 not shown) of another battery module when the battery module 100 is stacked with another battery module ( Figure 3 not shown), so as to disconnect the connection between the moving contact 613 and the first stationary contact 611 and / or the connection between the moving contact 613 and the second stationary contact 612.

[0047] Among them, the central post 614 can be set as an insulating material. The central post 614 is fixed to the housing 11 through an elastic material, and the elastic material can be a spring or an elastic metal sheet. The elastic material abuts the moving contact 613 against the first stationary contact 611 and the second stationary contact 612, so that the negative electrode of the battery pack 71 is connected to the common busbar 21.

[0048] In practical applications, such as Figure 3 As shown, when the battery module 100 is not stacked with another battery module, the moving contact 613 abuts against the first static contact 611 and the second static contact 612. At this time, since the first static contact 611 is connected to the common bus bar 21 and the second static contact 612 is connected to the negative connector 41, the common bus bar 21 and the negative connector 41 are electrically connected through the first static contact 611, the moving contact 613, and the second static contact 612.

[0049] When the battery module 100 is stacked with another battery module, the top post of the other battery module will contact the mechanical switch 61. Since the central post 614 is connected to the moving contact 613 and is disposed between the first static contact 611 and the second static contact 612, when the top post of the other battery module pushes the central post 614, it will drive the moving contact 613 to move, also causing the connection between the moving contact 613 and the first static contact 611 and / or the connection between the moving contact 613 and the second static contact 612 to be disconnected, thereby cutting off the electrical connection between the common bus bar 21 and the negative connector 41.

[0050] After the battery modules are stacked, the pushing force of the top post of the other battery module on the moving contact 613 or the central post 614 is maintained, so that the moving contact 613 and the static contacts (the first static contact 611 and / or the second static contact 612) remain disconnected, and the circuit remains open to meet the specific working requirements or safety needs after the battery modules are stacked.

[0051] When the battery module 100 is separated from another battery module, the pushing force of the top post of the other battery module on the moving contact 613 or the central post 614 disappears. Under the action of its own elasticity or other reset mechanisms, the moving contact 613 returns to the state of abutting against the first static contact 611 and the second static contact 612, and the electrical connection between the common bus bar 21 and the negative connector 41 is restored.

[0052] In summary, through the connection and disconnection of the moving contact and the static contacts, and the pushing action of the central post, this mechanical switch effectively controls the circuit connection state during the stacking and separation of the battery modules.

[0053] In some embodiments, the first surface of the top post 51 faces away from the central post, the second surface of the central post 614 faces away from the top post 51, the first surface of the positive connector 31 faces away from the negative connector 41, and the second surface of the negative connector 41 faces away from the positive connector 31. Among them, the distance between the first surface of the top post 51 and the second surface of the central post 614 is greater than the distance between the first surface of the positive connector 31 and the second surface of the negative connector 41.

[0054] It should be noted that the upper surface of the component in the attached drawing is its first surface, and the lower surface of the component in the attached drawing is its second surface. As Figure 4 shown, the distance L1 represents the distance between the first surface of the top post 51 and the second surface of the central post 614. The distance L2 represents the distance between the first surface of the positive electrode connector 31 and the second surface of the negative electrode connector 41.

[0055] In practical applications, when the battery module 100 is stacked with another battery pack, first, the central post 613 will be pushed by the top post of another battery module, so that the moving contact 613 is separated from the first static contact 611 and / or the second static contact 612. After that, as the distance between the two battery modules 100 gradually approaches, the negative electrode connector 41 of the battery module 100 is connected to the positive electrode connector ( Figure 3 not shown) of another battery module.

[0056] When the battery module 100 is disconnected from another battery module, first, the negative electrode connector 41 of the battery module 100 is disconnected from the positive electrode connector of another battery module. After that, the pushing force of the top post of another battery module on the moving contact 613 or the central post 614 disappears. Under the action of its own elasticity or other reset mechanisms, the moving contact 613 returns to the state of abutting against the first static contact 611 and the second static contact 612, and the electrical connection between the common bus bar 21 and the negative electrode connector 41 is restored again.

[0057] By setting the distance L1 to be greater than the distance L2, the risk of battery pack short circuit can be reduced. Moreover, during the entire disconnection process, the contact and separation of each conductive contact are pure mechanical action processes, with relatively high reliability.

[0058] In some embodiments, as Figure 3 shown, the connection detection module 81 includes a first signal connector 811, a second signal connector 812, and a diode D1. The first signal connector 811 is provided on the housing 11. The first signal connector 811 is exposed on the first side of the housing 11. The first signal connector 811 is used to connect to a control module ( Figure 3 not shown). The second signal connector 812 is provided on the housing 11. The second signal connector 812 is connected to the first signal connector 811. The positive electrode of the diode D1 is connected to the connection point between the first signal connector 811 and the second signal connector 812, and the negative electrode of the diode D1 is connected to the negative electrode connector 41 of the battery module 100.

[0059] Among them, when the battery module 100 is stacked with another battery module ( Figure 3 not shown), the second signal connector 812 of the battery module 100 is connected to the first signal connector ( Figure 3 not shown) of another battery module.

[0060] In some embodiments, the first surface of the first signal connector 811 faces away from the second signal connector 812, and the second surface of the second signal connector 812 faces away from the first signal connector 811. Among them, the distance between the first surface of the first signal connector 811 and the second surface of the second signal connector 812 is less than the distance between the first surface of the positive electrode connector 31 and the second surface of the negative electrode connector 41.

[0061] It should be noted that the upper surface of the component in the attached drawing is its first surface, and the lower surface of the component in the attached drawing is its second surface. As Figure 4 shown, the distance L1 represents the distance between the first surface of the top post 51 and the second surface of the center post 614. The distance L2 represents the distance between the first surface of the positive electrode connector 31 and the second surface of the negative electrode connector 41. The distance L3 represents the distance between the first surface of the first signal connector 811 and the second surface of the second signal connector 812.

[0062] In practical applications, as Figure 3 shown, when the second side of the battery module 100 is not connected to another battery module, the negative electrode of the diode D1 is connected to the common bus bar 21 (the common bus bar is similar to ground) through the first stationary contact 611, the moving contact 613, and the second stationary contact 612, so that the positive electrode of the diode D1 is at a low level.

[0063] When the second side of the battery module 100 approaches and starts to connect to the first side of another battery module, since the distance L3 is less than the distance L2 (see Figure 4 ), and the distance L2 is less than the distance L1. First, the center post 614 of the battery module 100 is pushed, disconnecting the connection between the moving contact 613 and the first stationary contact 611 and / or the connection between the moving contact 613 and the second stationary contact 612, so that the positive electrode of the diode D1 becomes a high level (i.e., the connection detection signal). Then, the two battery modules gradually approach until when the negative electrode connector 41 of the battery module 100 is connected to the positive electrode connector of another battery module, the positive electrode of the diode D1 becomes a low level. Thus, the control module ( Figure 3 not shown) connected to the first signal connector 811 can obtain a high level signal (i.e., the connection detection signal) from the first signal connector 811.

[0064] When the second side of the battery module 100 starts to disconnect from the first side of another battery module, the order is opposite to that of the connection process of the above two battery modules 100. When the two battery modules disconnect, the positive electrode of the diode D1 also obtains a high level signal (i.e., the connection detection signal).

[0065] In summary, through the above method, the connection detection module 81 can monitor the connection and disconnection status between battery modules in real time, and transmit relevant information to other circuits or devices by outputting a connection detection signal for corresponding control or feedback.

[0066] An embodiment of the present application provides a battery module 100. Traditional series connection of battery modules requires complex external wiring or bases, while this battery module 100 can automatically achieve electrical connection during stacking through the settings of a common bus bar 21, a positive connector 31, a negative connector 41, a top post 51, and a mechanical switch 61, reducing the need for external wiring and lowering the complexity and cost of connection. By using the cooperation of the top post 51 and the mechanical switch 61, series connection and switching of the switch state are automatically achieved during stacking of the battery modules, eliminating the need for manual intervention for complex circuit connection and switch operations, and improving the convenience and reliability of series connection of the battery modules. The design of the mechanical switch 61 enables it to be in a closed state when the battery modules are not stacked and automatically disconnect when stacked, reducing safety problems such as short circuits that may occur during series connection and improving the safety of the battery modules during series connection. Multiple battery modules can be conveniently stacked in series, and users can flexibly increase or decrease the number of battery modules according to actual voltage requirements to achieve flexible adjustment of the battery pack voltage, having good scalability.

[0067] Please refer to Figure 5 , Figure 5 which is a schematic structural diagram of a battery system provided by an embodiment of the present application.

[0068] An embodiment of the present application provides a battery system 1000. The battery system 1000 includes at least two battery modules, and the structure of each battery module in the at least two battery modules is the same as the structure of the battery module 100 in the above embodiment. The at least two battery modules are stacked.

[0069] Figure 5 Taking the stacking of two battery modules as an example, as Figure 5 shown, the battery module 100 and the battery module 200 are stacked.

[0070] Among them, the battery module 100 includes a housing 11, a common bus bar 21, a positive connector 31, a negative connector 41, a top post 51, a mechanical switch 61 (including a first stationary contact 611, a second stationary contact 612, a moving contact 613, and a center post 614), and a connection detection module 81 (including a first signal connector 811, a second signal connector 812, and a diode D1). The positive connector 31 is connected to the positive electrode of the battery pack 71, and the negative connector 41 is connected to the negative electrode of the battery pack 71.

[0071] Among them, the battery module 200 includes a housing 12, a common bus bar 22, a positive electrode connector 32, a negative electrode connector 42, a top post 52, a mechanical switch 62 (including a first stationary contact 621, a second stationary contact 622, a moving contact 623, and a center post 624), and a connection detection module 82 (including a first signal connector 821, a second signal connector 822, and a diode D2). The positive electrode connector 32 is connected to the positive electrode of the battery pack 72, and the negative electrode connector 42 is connected to the negative electrode of the battery pack 72.

[0072] Specifically, the working principle of the connection and disconnection of the two battery packs can refer to the above-mentioned embodiments, and will not be elaborated here.

[0073] Please refer to Figure 6 , Figure 6 which is a schematic structural diagram of another battery system provided by an embodiment of the present application.

[0074] In some embodiments, the battery system 1000 further includes a control module 90. The control module 90 is stacked with at least two battery modules. The control module 90 is configured to receive the connection detection signals output by the battery modules to determine the connection status of the at least two battery modules. The connection status includes a connected and / or disconnected state and a state that is not in a connected and / or disconnected state.

[0075] Specifically, the control module 90 includes a housing 91, a control unit 92, and a level detection unit 93. The control unit 92 and the level detection unit 93 are both disposed in the housing 91, and the control unit 92 is connected to the level detection unit 93. When the control module 90 is stacked with a battery module ( Figure 6 in this case, it is the battery module 100), the level detection unit 93 is connected to the first signal connector of the battery module.

[0076] Among them, the control unit 92 can be an MCU (Microcontroller Unit), or other devices that can achieve the same function. In the battery system 1000, the function of the control unit 92 is to receive the signals transmitted by the level detection unit 93 and process and analyze these signals, so as to determine the connection status of the at least two battery modules (including a connected and / or disconnected state and a state that is not in a connected and / or disconnected state).

[0077] The main function of the level detection unit 93 is to detect the level signal output by the first signal connector of the battery module. Since the connection detection module (such as the connection detection module 81 of the battery module 100) outputs a high-level signal (i.e., the connection detection signal) during the connection and / or disconnection process of the battery module. The level detection unit 93 detects and measures the high-level signal, and transmits the level information to the control unit 92, so that the control unit 92 can judge the connection status of the battery system 1000 according to the level situation.

[0078] It should be noted that, as Figure 6 shown, during the connection process of the two battery modules, the mechanical switch 61 (including the first stationary contact 611, the second stationary contact 612, the moving contact 613, and the central column 614) is first disconnected, and then the negative connector 41 and the positive connector 32 are connected.

[0079] During the disconnection process of the two battery packs, the negative connector 41 and the positive connector 32 are first disconnected, and the moving contact 613 in the mechanical switch 61 connects the first stationary contact 611 and the second stationary contact 612. During the process from the disconnection of the negative connector 41 and the positive connector 32 to the connection of the mechanical switch 61, when the mechanical switch 61 is not connected, the control module 90 will be powered down briefly (which may cause the control unit 92 and the level detection unit 93 not to work), and a super capacitor can be added to the control module 90 to supply power to the control unit 92 and the level detection unit 93.

[0080] The embodiment of the present application provides a battery system 1000. The traditional series connection of battery modules requires complex external wiring or a base, while the battery modules in this battery system 1000 can automatically achieve electrical connection when stacked, reducing the need for external wiring, and lowering the complexity and cost of connection. When the battery modules are stacked, series connection and switching state switching can be automatically achieved without manual intervention for complex circuit connection and switch operation, improving the convenience and reliability of the series connection of battery modules. Multiple battery modules can be conveniently stacked in series, and users can flexibly increase or decrease the number of battery modules according to actual voltage requirements to achieve flexible adjustment of the voltage of the battery system 1000, having good scalability.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them; under the idea of the present application, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the present application as described above. For the sake of brevity, they are not provided in detail; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery module, characterized in that, The battery module is used to stack with another battery module, and the battery module includes: A housing; A common busbar, which is arranged in the housing. The first end of the common busbar is exposed on the first side of the housing, and the second end of the common busbar is exposed on the second side of the housing; A positive connector, which is arranged in the housing. The positive connector is exposed on the first side of the housing and is used to connect the positive electrode of the battery pack; A negative connector, which is arranged in the housing. The negative connector is exposed on the second side of the housing and is used to connect the negative electrode of the battery pack; A top post, which is arranged in the housing and protrudes from the first side of the housing; A mechanical switch, which is arranged on the second side inside the housing. The mechanical switch connects the common busbar and the negative connector; Wherein, when the battery module stacks with another battery module, the second end of the common busbar of the battery module is connected to the first end of the common busbar of another battery module, the negative connector of the battery module is connected to the positive connector of another battery module, and the mechanical switch of the battery module is disconnected by the top post of another battery module.

2. The battery module according to claim 1, wherein The first side of the housing is arranged opposite to the second side of the housing.

3. The battery module according to claim 1, wherein The mechanical switch includes: A first stationary contact, which is connected to the common busbar; A second stationary contact, which is connected to the negative connector; A moving contact, which abuts against the first stationary contact and the second stationary contact; the moving contact is used to be pushed by the top post of another battery module when the battery module stacks with another battery module, so as to disconnect the connection between the moving contact and the first stationary contact and / or the connection between the moving contact and the second stationary contact.

4. The battery module according to claim 3, wherein The mechanical switch further includes: A central post, which is connected to the moving contact and is arranged between the first stationary contact and the second stationary contact; the central post is used to be pushed by the top post of another battery module when the battery module stacks with another battery module, so as to disconnect the connection between the moving contact and the first stationary contact and / or the connection between the moving contact and the second stationary contact.

5. The battery module according to claim 4, wherein The first surface of the top post is opposite to the central post, the second surface of the central post is opposite to the top post, the first surface of the positive connector is opposite to the negative connector, and the second surface of the negative connector is opposite to the positive connector; Wherein, the distance between the first surface of the top post and the second surface of the central post is greater than the distance between the first surface of the positive connector and the second surface of the negative connector.

6. The battery module according to claim 5, wherein The battery module further includes: A connection detection module is provided in the housing. The first end of the connection detection module is exposed on the first side of the housing, and the connection detection module is connected to the negative electrode connector. The connection detection module is configured to output a connection detection signal during the process of connecting the second side of the battery module to the first side of another battery module and during the process of disconnecting the second side of the battery module from the first side of another battery module.

7. The battery module according to claim 6, wherein the connection detection module includes: a first signal connector provided in the housing, the first signal connector being exposed on the first side of the housing, and the first signal connector being configured to connect to a control module; a second signal connector provided in the housing, the second signal connector being connected to the first signal connector; a diode D1, the positive electrode of the diode D1 being connected to the connection point between the first signal connector and the second signal connector, and the negative electrode of the diode D1 being connected to the negative electrode connector of the battery module; wherein, when the battery module is stacked with another battery module, the second signal connector of the battery module is connected to the first signal connector of another battery module.

8. The battery module according to claim 7, wherein The first surface of the first signal connector faces away from the second signal connector, and the second surface of the second signal connector faces away from the first signal connector; wherein the distance between the first surface of the first signal connector and the second surface of the second signal connector is less than the distance between the first surface of the positive electrode connector and the second surface of the negative electrode connector.

9. A battery system, characterized in that, The battery system includes: at least two battery modules according to any one of claims 1 to 8, and the at least two battery modules are stacked.

10. The battery system according to claim 9, characterized in that The battery system further includes: a control module, the control module being stacked with the at least two battery modules; the control module is configured to receive the connection detection signal output by the battery module to determine the connection state of the at least two battery modules.

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