Battery cell equalization device and battery pack

Abstract

The application provides an electric cell equalization device and a battery pack, the device comprising a plurality of cable assemblies, an equalization control module and an overcurrent protection element; one end of the cable assembly is electrically connected with the equalization control module, and the other end of the cable assembly is used for electrically connecting with the battery; the overcurrent protection element is arranged on the cable assembly; wherein the overcurrent protection element is used for limiting the current flowing through the cable assembly; the equalization control module is configured to equalize the battery under the condition that the cable assembly is electrically connected with the battery. The electric cell equalization device sets the overcurrent protection element on each cable assembly in the electric cell equalization device to limit the current of each cable assembly of the electric cell equalization device, prevents excessive current from flowing into important components such as the equalization control module inside the electric cell equalization device, and further protects the electric cell equalization device from being damaged during the equalization process. It not only ensures the smooth equalization of the battery, but also avoids serious safety accidents such as fire caused by short circuit.

Description

Technical Field

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

[0002] Most batteries currently available contain multiple cells (or individual cells). Taking the power batteries of new energy vehicles as an example, due to differences in the manufacturing processes of individual cells and the influence of complex operating conditions, imbalances in parameters such as voltage and capacity among individual cells are frequent. For instance, under different operating conditions such as frequent start-stop and high-speed driving in new energy vehicles, the imbalance among individual cells is exacerbated by the differences in the depth and rate of charge and discharge of each cell.

[0003] To address battery imbalance, a cell balancing device is typically used to transfer or dissipate energy from individual cells to achieve equilibrium. During this process, the balancing harness of the cell balancing device connects to the individual cells for balancing.

[0004] However, during the battery balancing process using cell balancing devices, overcurrent issues frequently occur. For example, the current in the balancing harness may abnormally increase. Specifically, this can be caused by a short circuit within a single cell triggering a sudden current surge, which then flows excessively through the balancing harness and is conducted to the flexible printed circuit board (FPC, a crucial component of the cell balancing device). Because the FPC has limited current-carrying capacity and is easily damaged, excessive current flowing through it often damages the entire cell balancing device. In other words, current cell balancing devices are highly susceptible to damage during battery balancing. Utility Model Content

[0005] The purpose of this application is to provide a battery cell equalization device and a vehicle. By limiting the current of each cable assembly of the battery cell equalization device, excessive current is prevented from flowing into important components such as the equalization control module inside the battery cell equalization device, thereby protecting the battery cell equalization device from damage during the equalization process.

[0006] In a first aspect, this application provides a cell balancing device, including a plurality of cable assemblies, a balancing control module, and an overcurrent protection element; one end of the cable assembly is electrically connected to the balancing control module, and the other end of the cable assembly is used to be electrically connected to a battery; the overcurrent protection element is disposed on the cable assembly; wherein the overcurrent protection element is used to limit the current flowing through the cable assembly; the balancing control module is configured to balance the battery when the cable assembly is electrically connected to the battery.

[0007] The aforementioned cell balancing device, by incorporating overcurrent protection components on each cable assembly, limits the current flowing into these components, effectively preventing excessive current from entering critical components such as the balancing control module. This significantly protects the cell balancing device from damage during the balancing process. Ultimately, this ensures successful battery balancing while also preventing serious safety incidents such as fires caused by short circuits.

[0008] In conjunction with the first aspect, the overcurrent protection element may optionally include a removable fuse.

[0009] The aforementioned cell balancing device uses removable fuses as overcurrent protection components, resulting in lower costs. Furthermore, because removable fuses operate on the principle of melting under overcurrent conditions, their reliability is also higher. Thus, while reducing the cost of the cell balancing device, the higher reliability of the removable fuses provides better protection for the device.

[0010] In conjunction with the first aspect, optionally, the removable fuse is connected to the cable assembly via a plug and a socket; the cable assembly is provided with one of the plug and the socket; and the removable fuse is provided with the other of the plug and the socket.

[0011] The aforementioned cell balancing device connects the removable fuse to the cable assembly via a plug-and-socket connection, facilitating fuse replacement and thus improving the ease of use of the cell balancing device.

[0012] In conjunction with the first aspect, optionally, the cable assembly includes a cable connector, a pre-stage cable, and a post-stage cable; the cable connector has a pre-stage connector and a post-stage connector; wherein the pre-stage connector and the post-stage connector are electrically connected; one end of the pre-stage cable is inserted into the pre-stage connector, and the other end of the pre-stage cable is used for electrical connection to the battery; one end of the post-stage cable is inserted into the post-stage connector, and the other end of the post-stage cable is electrically connected to the equalization control module; the overcurrent protection element is disposed on the pre-stage cable and / or the post-stage cable.

[0013] The aforementioned cell balancing device increases the length of the cable assembly by configuring cable connectors for the cable assembly, even with limited cable length. Furthermore, the separate connectors between the pre-amplifier and post-amplifier cables facilitate individual replacement of the respective cables.

[0014] In conjunction with the first aspect, optionally, the other end of the rear-stage cable is detachably electrically connected to the equalization control module; the number of cable connectors is at least two, the number of pre-stage connectors on the cable connectors is at least two, and the number of rear-stage connectors is the same as the number of pre-stage connectors.

[0015] The aforementioned cell balancing device connects a certain number of pre-stage and post-stage cables via multiple cable connectors, achieving modularity of the cable assembly. This allows for the addition or removal of modular cable assemblies when balancing cells with varying numbers of individual cells, thereby further improving the ease of use and applicability of the cell balancing device.

[0016] In conjunction with the first aspect, optionally, the preamplifier ports are arranged on the cable connector along a first direction; the power amplifier ports are arranged on the cable connector along a second direction; wherein the first direction and the second direction are parallel.

[0017] The aforementioned cell balancing device arranges the front and rear connectors on the cable connectors in a straight line, making the front and rear cables more orderly. This facilitates connecting the corresponding connection points on the battery to the corresponding balancing connectors on the balancing control module via the corresponding cable assemblies.

[0018] In conjunction with the first aspect, optionally, the device further includes a cable bundling device; the number of cable bundling devices is the same as the number of cable connectors; the cable bundling device is sleeved on the entire group of downstream cables; wherein, the entire group of downstream cables refers to all downstream cables connected to the same cable connector.

[0019] The aforementioned cell balancing device uses a vertical cable device to gather the downstream cables connected to the unified cable connectors together, avoiding the messy arrangement of several downstream cables. It also makes it easier to identify the downstream cables connected to each cable connector.

[0020] In conjunction with the first aspect, the wire harness may optionally include heat shrink tubing.

[0021] The aforementioned cell balancing device uses heat shrink tubing to store downstream cables on the same cable connector. Compared to different tubing, the heat shrink tubing fits more tightly with the downstream cables, thereby improving the stability of storing and organizing the downstream cables.

[0022] In conjunction with the first aspect, optionally, the equalization control module is provided with equalization ports of the same number as the number of the downstream cables; the downstream cables are electrically connected to the equalization control module through the equalization ports.

[0023] The aforementioned cell balancing device, by setting a balancing port on the balancing control module, allows downstream cables to be quickly connected to or disconnected from the balancing control module through the balancing port, thereby further improving the ease of use of the cell balancing device.

[0024] In conjunction with the first aspect, optionally, the cable connector is provided with a first identifier consistent with the number of the rear-stage connectors; the first identifier is close to the rear-stage connectors and is used to mark the rear-stage connectors; the equalization control module is provided with a second identifier consistent with the number of equalization connectors; the second identifier is close to the equalization connectors and is used to mark the equalization connectors; wherein, the first identifier and the second identifier correspond one-to-one.

[0025] The aforementioned cell balancing device facilitates the connection of each downstream cable to its corresponding balancing port by setting a first identifier near the downstream connector and a second identifier corresponding to the balancing connector. Furthermore, it allows for the connection of the corresponding first cable to the corresponding cell in the battery based on the first and second identifiers.

[0026] In conjunction with the first aspect, optionally, the end of the cable assembly used for electrical connection with the battery is provided with an insulating terminal.

[0027] The aforementioned cell balancing device, by setting an insulating terminal at the end of the cable assembly connected to the battery, insulates that end of the cable assembly when it is not connected to the battery, thus preventing leakage of the cable assembly and protecting the cell balancing device.

[0028] Secondly, this application provides a battery pack including the cell balancing device described in the first aspect. The battery pack employs CTP (Cell to Pack) technology.

[0029] The aforementioned battery pack has the same beneficial effects as the cell balancing device described in the first aspect or any alternative embodiment of the first aspect.

[0030] Thirdly, this application provides a vehicle including the cell equalization device described in the first aspect.

[0031] The aforementioned vehicle has the same beneficial effects as the cell balancing device described in the first aspect or any alternative embodiment of the first aspect.

[0032] In summary, the cell balancing device and vehicle provided in this application effectively protect the cell balancing device from damage during the balancing process by setting overcurrent protection elements on each cable assembly in the cell balancing device to limit the current of each cable assembly. This ensures smooth battery balancing and effectively avoids serious safety accidents such as fires caused by short circuits. The connection between the removable fuse and the cable assembly is achieved through a plug-and-socket connection, facilitating fuse replacement. Multiple cable connectors connect a certain number of front-end and rear-end cables, achieving modularity of the cable assembly. This allows for the addition or removal of modular cable assemblies when balancing batteries with different numbers of individual cells, further improving the ease of use and applicability of the cell balancing device. A vertical cable device organizes the rear-end cables connected to the unified cable connectors together, avoiding the messy arrangement of several rear-end cables and making it easier to identify the rear-end cables connected to each cable connector. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a first schematic diagram of a cell equalization device provided in an embodiment of this application; Figure 2 This is a second schematic diagram of the cell balancing device provided in the embodiments of this application.

[0035] Icons: 100, Cell equalization device; 110, Cable assembly; 111, Cable connector; 1111, Preamplifier connector; 1112, Power amplifier connector; 1113, First identifier; 112, Preamplifier cable; 113, Power amplifier cable; 120, Equalization control module; 121, Equalization connector; 122, Second identifier; 130, Overcurrent protection element; 140, Heat shrink tubing; 150, Insulating terminal. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0041] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0042] Please refer to Figure 1 , Figure 1 This is a first schematic diagram of the cell equalization device 100 provided in the embodiments of this application. The cell equalization device 100 provided in the embodiments of this application may include a plurality of cable assemblies 110, an equalization control module 120, and an overcurrent protection element 130.

[0043] The cable assembly 110 may include multi-level cables, plugs, cable connectors, and cable storage components. One end of the cable assembly 110 can be electrically connected to the balancing control module 120, and the other end can be electrically connected to the battery. Typically, the individual cells within a battery are connected in series. During battery balancing, each cable assembly 110 of the cell balancing device 100 is connected to the positive and negative terminals of the battery, as well as to the connection points where the individual cells are connected in series. Taking a battery consisting of two individual cells as an example, this battery includes two individual cells, namely cell 1 and cell 2. The positive terminal of cell 1 and the negative terminal of cell 2 serve as the positive and negative terminals for connecting the battery to the load; the negative terminal of cell 1 and the positive terminal of cell 2 are electrically connected via a wire. Therefore, during the balancing process of this battery, three cable assemblies 110 of the cell balancing device 100 are typically used. Two cable assemblies 110 are connected to the positive and negative terminals of the battery, respectively, and the remaining cable assembly 110 is used to connect the negative terminal of cell 1 to cell 2. Therefore, the N-cable assembly 110 can connect and balance N-1 individual batteries.

[0044] The overcurrent protection element 130 can specifically be a smart circuit breaker, a fuse, a transistor overcurrent protection element, an electronic overload relay, etc. This overcurrent protection element 130 can be installed on the cable assembly 110. Specifically, the overcurrent protection element 130 can limit the current flowing through the cable assembly 110. That is, if the current in the cable assembly 110 exceeds a current threshold, the cable assembly 110 will no longer conduct. For example, with a fuse, if the current exceeds the threshold, the fuse will blow to cut off the circuit; similarly, with a transistor overcurrent protection element, if the current exceeds the threshold, the current will be cut off based on the transistor's current amplification and switching characteristics.

[0045] The equalization control module 120 can be configured to equalize the battery when the cable assembly 110 is electrically connected to the battery. The equalization control module 120 can be a core component in the cell equalization device 100 and may include an FPC.

[0046] In the above implementation process, by setting overcurrent protection elements 130 on each cable assembly 110 in the cell equalization device 100, the current of each cable assembly 110 of the cell equalization device 100 is limited, which basically prevents excessive current from flowing into important components such as the equalization control module 120 inside the cell equalization device 100, thereby effectively protecting the cell equalization device 100 from damage during the equalization process. Ultimately, this ensures successful battery equalization and also effectively avoids serious safety accidents such as fires caused by short circuits.

[0047] In some alternative implementations, the overcurrent protection element 130 may include a removable fuse.

[0048] In the above implementation process, by using a removable fuse as the overcurrent protection element 130, the cost is lower, and since the removable fuse is based on the principle that it will melt under overcurrent conditions, its reliability is also higher. Thus, on the basis of reducing the cost of the cell equalization device 100, the higher reliability of the removable fuse also provides better protection for the cell equalization device 100.

[0049] In some alternative implementations, the removable fuse can be connected to the cable assembly 110 via a plug and a socket. The cable assembly 110 may be equipped with one of the plug and the socket. The removable fuse may be equipped with the other of the plug and the socket.

[0050] For example, the removable fuse may specifically be a glass tube fuse. The fuse is disposed inside the glass tube. A plug is disposed outside the glass tube, and a socket adapted to the plug is disposed on the cable assembly 110; or a socket is disposed outside the glass tube, and a plug adapted to the socket is disposed on the cable assembly 110.

[0051] In the above implementation process, the connection between the removable fuse and the cable assembly 110 is achieved through a plug-in connection between the plug and the socket, which facilitates fuse replacement. This improves the ease of use of the cell balancing device 100.

[0052] Please refer to Figure 2 , Figure 2 This is a second schematic diagram of the cell equalization device 100 provided in this application embodiment. In some optional embodiments, the cable assembly 110 may include a cable connector 111, a pre-stage cable 112, and a post-stage cable 113. The cable connector 111 may have a pre-stage connector 1111 and a post-stage connector 1112. The pre-stage connector 1111 and the post-stage connector 1112 are electrically connected.

[0053] One end of the preamp cable 112 can be plugged into the preamp socket 1111, and the other end of the preamp cable 112 can be electrically connected to the battery. One end of the power amplifier cable 113 can be plugged into the power amplifier socket 1112, and the other end of the power amplifier cable 113 can be electrically connected to the equalization control module 120. In other words, the preamp cable 112 and the power amplifier cable 113 can be electrically connected through the cable connector 111.

[0054] The overcurrent protection element 130 can be installed on the pre-amplifier cable 112 and / or the post-amplifier cable 113. That is, the overcurrent protection element 130 can be installed only on the pre-amplifier cable 112, or only on the post-amplifier cable 113, or both the pre-amplifier cable 112 and the post-amplifier cable 113 can be equipped with the overcurrent protection element 130.

[0055] In the above implementation process, by configuring cable connectors 111 for cable assembly 110, the length of cable assembly 110 is increased by combining cables when the cable length is limited. Furthermore, since the pre-stage cable 112 and the post-stage cable 113 are respectively connected to the connectors 111, the individual replacement of the pre-stage cable 112 and the post-stage cable 113 is convenient.

[0056] Please continue to refer to Figure 2 In some alternative implementations, the other end of the power cable 113 may be detachably electrically connected to the equalization control module 120. The number of cable connectors 111 may be at least two, the number of preamplifier ports 1111 on the cable connectors 111 may be at least two, and the number of power amp ports 1112 may be the same as the number of preamplifier ports 1111.

[0057] For example, there are three cable connectors 111, and each cable connector 111 has 10 pre-amplifier ports 1111. Therefore, based on the previous description, the cable assembly 110 on each cable connector 111 can balance 9 individual cells. Each cable connector 111, along with its connected pre-amplifier cable 112 and post-amplifier cable 113, can be considered a module. Three such modules can balance 27 individual cells. In practical applications, based on the detachable connection between the post-amplifier cable 113 and the balancing control module 120, the number of modules can be configured according to the specific number of individual cells in the battery. For example, if the battery to be balanced on a device includes 10 individual cells, then two modules are sufficient for the cell balancing device 100. In other words, two cable connectors 111, along with their connected pre-amplifier cables 112 and post-amplifier cables 113, can be installed on the balancing control module 120. When the cell balancing device 100 is removed from the device and used to balance a battery consisting of 25 individual cells on another device, another module can be installed on the balancing control module 120, namely a cable connector 111 connected to the pre-stage cable 112 and the post-stage cable 113.

[0058] In the above implementation process, a certain number of pre-stage cables 112 and post-stage cables 113 are connected by multiple cable connectors 111, realizing the modularization of the cable assembly 110. This facilitates the addition or removal of modular cable assemblies 110 when the cell balancing device 100 is balancing cells of different numbers. This further improves the ease of use and applicability of the cell balancing device 100.

[0059] Please continue to refer to Figure 2 In some alternative embodiments, the preamplifier port 1111 may be arranged on the cable connector 111 along a first direction. The power amp port 1112 may be arranged on the cable connector 111 along a second direction. The first direction may be parallel to the second direction.

[0060] In other words, both the preamplifier connector 1111 and the power amp connector 1112 are arranged in a straight line on the cable connector 111. For example, a terminal block.

[0061] In the above implementation process, by arranging the preamplifier port 1111 and the emulator port 1112 on the cable connector 111 in a straight line, the preamplifier cable 112 and the emulator cable 113 are made more orderly, which facilitates the connection of the corresponding connection point on the battery to the corresponding equalization port 121 on the equalization control module 120 through the corresponding cable assembly 110.

[0062] Please continue to refer to Figure 2 In some optional embodiments, the cell equalization device 100 provided in this application may further include a wire bundling device. The number of wire bundling devices may be the same as the number of cable connectors 111. The wire bundling device may be sleeved on the entire group of downstream cables 113. The entire group of downstream cables may be all downstream cables 113 connected to the same cable connector 111.

[0063] Cable management devices can specifically include rubber sleeves, cable ties, coiled termination straps, and guide rail cable clamps. These devices allow downstream cables 113 belonging to the same module to be bundled together.

[0064] In the above implementation process, the vertical cable device gathers the downstream cables 113 connected to the unified cable connector 111 together, avoiding the mess of several downstream cables 113, and also makes it easier to identify the downstream cables 113 connected to each cable connector 111.

[0065] Please continue to refer to Figure 2 In some alternative embodiments, the wire harness may include heat shrink tubing 140.

[0066] As an alternative implementation, before using the heat shrink tubing 140 to house the downstream cables 113 on the same cable connector 111, the downstream cables 113 can be bundled with electrical rubber. Then, the heat shrink tubing 140 is applied and heated to shrink it.

[0067] In the above process, by using heat shrink tubing 140 to store the downstream cable 113 on the same cable connector 111, compared with different sleeves, the heat shrink tubing 140 fits more tightly with the downstream cable 113, thereby improving the stability of storing and organizing the downstream cable 113.

[0068] Please continue to refer to Figure 2 In some optional embodiments, the equalization control module 120 may be provided with equalization ports 121 in the same number as the downstream cables 113. The downstream cables 113 can be electrically connected to the equalization control module 120 through the equalization ports 121.

[0069] The equalization connector 121 can be a connector used to connect the power supply cable 113 to the various equalization points on the equalization control module 120. Accordingly, the end of the power supply cable 113 can be configured with a plug that is compatible with the equalization connector 121.

[0070] In the above implementation process, by setting an equalization port 121 on the equalization control module 120, the downstream cable 113 can be quickly connected to or disconnected from the equalization control module 120 through the equalization port 121, thereby further improving the ease of use of the cell equalization device 100.

[0071] Please continue to refer to Figure 2 In some alternative embodiments, the cable connector 111 may be provided with a first identifier 1113 corresponding to the number of rear connectors 1112. The first identifier 1113 may be located near the rear connectors 1112 and may be used to mark the rear connectors 1112. The first identifier 1113 may specifically be a number or an English letter, etc.

[0072] The equalization control module 120 may be equipped with a second identifier 122, the same number as the equalization sockets 121. The second identifier 122 may be located near the equalization sockets 121 and may be used to mark the equalization sockets 121. The second identifier 122 may be a number or an English letter, etc.

[0073] The first identifier can correspond one-to-one with the second identifier. For example, each of the downstream connectors 1112 of the cable connector 111 is sequentially marked with a first identifier 1113 such as "1, 2, 3...". Correspondingly, the equalization connector 121 of the equalization control module 120 is also sequentially marked with a second identifier 122 such as "1, 2, 3...". Therefore, when connecting the downstream cable 113 to the equalization control module 120, the downstream cable 113 connected to the downstream connector 1112 marked with "1" can be connected to the equalization connector 121 on the equalization control module 120 marked with "1"; similarly, the downstream cable 113 connected to the downstream connector 1112 marked with "2" can be connected to the equalization connector 121 on the equalization control module 120 marked with "2".

[0074] In the above implementation process, by setting a first identifier 1113 near the rear stage connector 1112 and a corresponding second identifier 122 on the equalization connector 121, it is convenient to connect each rear stage cable 113 to the corresponding equalization connector 121. Furthermore, based on the first identifier 1113 and the second identifier 122, the corresponding first cable can be connected to the corresponding cell in the battery.

[0075] Please continue to refer to Figure 2 In some alternative embodiments, the cable assembly 110 may have an insulating terminal 150 at one end for electrical connection to the battery. The insulating terminal 150 is typically a metal conductive component for wire connection, and its main structure is a metal piece embedded in insulating plastic.

[0076] In the above implementation process, by providing an insulating terminal 150 at the end of the cable assembly 110 that is connected to the battery, the cable assembly 110 is insulated at this end when it is not connected to the battery, thus preventing leakage of the cable assembly 110. Furthermore, by insulating this end of the cable assembly 110, the battery cell equalization device 100 is protected.

[0077] Based on the same concept, embodiments of this application provide a battery pack that may include the cell balancing device 100 described above. This battery pack may employ CTP (Cell to Pack) technology.

[0078] Based on the same concept, embodiments of this application provide a vehicle that may include the cell equalization device 100 as described above.

[0079] The above implementation process is the same as that of the cell balancing device 100 described above, and will not be repeated here.

[0080] In summary, the cell balancing device 100 and vehicle provided in the various embodiments of this application effectively protect the cell balancing device 100 from damage during the balancing process by providing overcurrent protection elements 130 on each cable assembly 110 in the cell balancing device 100 to limit the current of each cable assembly 110. This ensures smooth battery balancing and effectively avoids serious safety accidents such as fires caused by short circuits. The connection between the removable fuse and the cable assembly 110 is achieved through a plug-and-socket connection, facilitating fuse replacement. Multiple cable connectors 111 connect a certain number of front-end cables 112 and rear-end cables 113, realizing the modularity of the cable assembly 110. This allows the cell balancing device 100 to easily add or remove modular cable assemblies 110 when balancing batteries with different numbers of individual cells. This further improves the ease of use and applicability of the cell balancing device 100. The vertical cable device gathers the downstream cables 113 connected to the unified cable connector 111 together, avoiding the mess of several downstream cables 113, and also makes it easier to identify the downstream cables 113 connected to each cable connector 111.

[0081] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A cell balancing device, characterized in that, Includes several cable assemblies, a balanced control module, and overcurrent protection components; One end of the cable assembly is electrically connected to the equalization control module, and the other end of the cable assembly is used to electrically connect to the battery; The overcurrent protection element is disposed on the cable assembly; wherein the overcurrent protection element is used to limit the current flowing through the cable assembly; The equalization control module is configured to equalize the battery when the cable assembly is electrically connected to the battery.

2. The cell balancing device according to claim 1, characterized in that, The overcurrent protection element includes a removable fuse; wherein the removable fuse is connected to the cable assembly via a plug and socket; The cable assembly is provided with one of the plug and the socket; The detachable fuse is equipped with the other of the plug and socket.

3. The cell balancing device according to claim 1, characterized in that, The cable assembly includes cable connectors, a pre-amplifier cable, and a post-amplifier cable; The cable connector has a pre-amplifier port and a post-amplifier port; wherein the pre-amplifier port and the post-amplifier port are electrically connected. One end of the preamp cable is inserted into the preamp socket, and the other end of the preamp cable is used for electrical connection with the battery. One end of the power cable is plugged into the power connector, and the other end of the power cable is electrically connected to the equalization control module. The overcurrent protection element is disposed on the pre-amplifier cable and / or the post-amplifier cable.

4. The cell balancing device according to claim 3, characterized in that, The other end of the downstream cable is detachably electrically connected to the equalization control module; The number of cable connectors is at least two, the number of pre-amplifier ports on the cable connectors is at least two, and the number of post-amplifier ports is the same as the number of pre-amplifier ports.

5. The cell balancing device according to claim 4, characterized in that, The pre-amplifier ports are arranged along the first direction on the cable connector; The rear connector is arranged along the second direction on the cable connector; Wherein, the first direction is parallel to the second direction.

6. The cell balancing device according to claim 4, characterized in that, The device also includes a wire harness; The number of the wire harness devices is the same as the number of the cable connectors; The cable bundle is fitted over the entire set of downstream cables; wherein, the entire set of downstream cables refers to all downstream cables connected to the same cable connector.

7. The cell balancing device according to claim 4, characterized in that, The equalization control module is equipped with equalization ports that are the same number as the number of downstream cables; The downstream cable is electrically connected to the equalization control module through the equalization connector.

8. The cell balancing device according to claim 7, characterized in that, The cable connector is provided with a first identifier that is consistent with the number of the rear-stage connectors; The first identifier is located near the rear connector and is used to mark the rear connector; The equalization control module is provided with a second identifier that is consistent with the number of equalization ports. The second identifier is located near the equalization socket and is used to mark the equalization socket; The first identifier and the second identifier correspond one-to-one.

9. The cell balancing device according to any one of claims 1 to 8, characterized in that, The cable assembly has an insulated terminal at one end for electrical connection with the battery.

10. A battery pack, characterized in that, Includes the cell balancing device according to any one of claims 1 to 9.

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