Battery module and battery pack thereof

Abstract

The invention discloses a battery module and a battery pack thereof, and aims to solve the defects required by a container due to the fact that the length of the existing battery pack is only half of the width of the container. The module comprises a front module and a rear module, both the front module and the rear module are provided with battery cells and integrated busbars, the battery cells of the front module are electrically connected with the battery cells of the rear module, and the integrated busbars are electrically connected with the integrated busbars of the front module and the rear module through flexible circuit boards. The front module and the rear module are connected through the connecting bar and the flexible circuit board, so that the length of a single battery pack is increased, the energy storage container is supported to open a door at a single side, and the deployment density of the container is improved while the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of power storage, and more specifically, to a battery module and a battery pack thereof. Background Art

[0002] Battery packs can be used as supporting components for new energy sources such as wind energy and solar energy. New energy sources such as wind energy and solar energy have the problem of imbalance in time latitude, and need to be equipped with corresponding energy storage components. Battery packs can also be used as a supplement to the existing power grid as an AC power supply for important equipment to prevent sudden power outages from affecting normal operation and causing damage to equipment, eliminate "power pollution" such as surges, instantaneous high / low voltages, wire noise and frequency deviations in the mains, improve power quality, and provide high-quality power for computers, etc.

[0003] When deploying battery energy storage solutions, relevant technologies will be deployed in clusters in the form of battery cells-battery modules-battery packs-battery clusters-battery storage containers, and a battery management system will be used between each group to perform fire warning, thermal management, balancing control, charge and discharge management, fault diagnosis, etc.

[0004] Existing battery packs are generally combined into 1P52S and four 1P13S small modules. Each small module uses a PCB board or FPC acquisition circuit board to collect voltage and temperature, forming a 4-row 13-column arrangement of cells. When deployed in a 20-foot container, symmetrical deployment on both sides is adopted. The disadvantage of this method is that due to the need to connect the wiring harness and facilitate manual management, the symmetrically deployed containers need to have doors on both sides, which requires adjacent containers to provide aisles for support personnel to walk in, and back-to-back deployment cannot be achieved.

[0005] In summary, there is an urgent need for a battery module and a battery pack thereof, which are longer than existing battery packs (to adapt to the width of the container) so as to realize single-sided door opening of the container, reduce the cost of the container, support back-to-back deployment of the containers, and improve the energy density per unit area. Summary of the invention

[0006] The present invention overcomes the problem that the existing battery pack length is only half of the width of the container, resulting in insufficient container requirements, and provides a battery module and its battery pack, which can support single-sided door opening, reduce container costs, support back-to-back deployment of containers, and improve energy density per unit area.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: A battery module comprises a front module and a rear module, both of which have battery cells and an integrated busbar, the battery cells of the front module are electrically connected to the battery cells of the rear module, and the integrated busbars of the front module and the rear module are electrically connected via a flexible circuit board.

[0008] The number of battery cells in the front module is the same as the number of battery cells in a single battery pack in the prior art. The present application further provides a rear module based on the front module, and the number of battery cells in the rear module is similar to that in the front module. The integrated busbar includes a PCB for transmitting electrical signals, a sampling sensor, and an aluminum connecting bar for electrically connecting adjacent battery cells. A power source is formed between the battery cells in the front module and the rear module through the aluminum bar. The front module and the rear module form a power source through the physical connection of the aluminum bar.

[0009] In order to be compatible with existing production processes, the existing module molding equipment is used to arrange the battery cells of the front module and the rear module, and then the integrated busbar and flexible circuit board are positioned and fixed on the battery cells.

[0010] Among them, the battery cells (including the battery cells of the front module and the battery cells of the rear module) are electrically connected through the connecting bar, and the two ends of the connecting bar are respectively connected to the corresponding pole positions of the battery cells. The PCB and the sampling sensor are located on the top of the connecting bar.

[0011] The present application connects two sub-modules equivalent to the size of existing modules through a flexible circuit board, thereby merging the two modules in length. In this way, it is only necessary to set up a fire protection interface, a liquid cooling interface and an electrical connection wire on one side of the battery pack to manage the original two modules and realize single-sided door opening and back-to-back deployment of the container.

[0012] Preferably, the integrated busbar is provided with collection sensors corresponding to the number of cells, and the collection sensors are set corresponding to the cells. In the prior art, based on the standard requirements for the impedance of the voltage sampling copper wire loop, one collection point (collection sensor) is set for two cells, which has the risk of inaccurate sampling temperature and untimely alarm. This application reduces the impedance of the loop by thickening the cross-sectional area of ​​the sampling copper wire, thereby supporting more collection points.

[0013] Preferably, the acquisition sensors of the front module and the rear module are electrically connected to the controllers on the front module and the rear module respectively, and the controllers on the front module and the rear module transmit electrical signals representing the temperature through the flexible circuit board. The structure receives temperature information through two controllers, so that the acquisition points on the front module and the rear module only need to be connected to the controllers on the front module and the rear module, thereby reducing the length of the line and reducing the impedance of the loop. The processed electrical signals representing the numerical values ​​are directly transmitted between the controllers on the front module and the rear module and transmitted to the upper-level battery management system in the form of relays.

[0014] Preferably, the front module and the rear module position the cells by means of tie bands and front and rear end plates, respectively. The structure is fully compatible with the existing cell arrangement and positioning device, reduces the production cost of the device and improves the flexibility of the production line.

[0015] Preferably, a positioning film is also included, which is coated on the integrated busbar and the flexible circuit board on the front module and the rear module. The positioning film is made of PET, and the integrated busbar and the flexible circuit board are fixed by PET to ensure that the flexible circuit board in the middle is not subjected to stress.

[0016] Preferably, the currents provided by the front module and the rear module are equal. According to common knowledge, the voltages of parallel circuits are the same, and the currents are cumulative, and the currents of series circuits are the same and the voltages are cumulative. The front module and the rear module have the same parallel group. For example, the front module and the rear module are both two groups of cells in parallel. The configuration makes the currents output by the front module and the rear module the same.

[0017] Preferably, the battery module comprises two groups of parallel battery cells.

[0018] Preferably, the configurations of the controllers of the front module and the rear module are the same, the controller that responds first after awakening is the main controller, and the other controller only provides the functions of collecting electrical signals and relaying electrical signals. The structure provides redundancy of the module, and preferably taking the controller that responds first as the main controller can speed up the response speed of the battery module, coordinate the work of the two controllers, return it to the existing technology of single controller control, and reduce costs.

[0019] A battery pack includes the battery modules as described above, wherein the battery modules are connected in series.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The front module and the rear module are connected by connecting rows and flexible circuit boards, thereby increasing the length of a single battery pack and supporting the energy storage container to open the door on one side, reducing costs while increasing the deployment density of containers. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the present invention; Figure 2 yes Figure 1 Schematic diagram of removing the positioning membrane; Figure 3 yes Figure 2 Schematic diagram of further removing the integrated busbar; Figure 4 is a schematic diagram of the battery cell connection of the present invention; In the figure: Front module 1, rear module 2, battery cell 3, integrated busbar 4, flexible circuit board 5, positioning film 6, end plate 7, cable tie 8, connecting bar 9. DETAILED DESCRIPTION

[0022] The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.

[0023] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present disclosure, and do not specifically refer to any part or element in the present disclosure and should not be understood as limitations on the present disclosure.

[0026] In the present disclosure, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present disclosure can be determined according to specific circumstances, and they cannot be understood as limitations on the present disclosure.

[0027] Example: A battery module, Figure 1 As shown, it includes a front module 1 and a rear module 2. Among them, the length of the front module 1 is the same as the length of the existing battery module. For example, the number of battery cells 3 in the front module 1 is the same as the number of battery cells 3 in a single battery pack in the prior art. The difference is that the rear module 2 is externally mounted. The present application further provides a rear module 2 on the basis of the front module 1, and the number of battery cells 3 in the rear module 2 is similar to the number of battery cells 3 in the front module 1. The integrated busbar 4 includes a PCB for transmitting electrical signals, a sampling sensor, and an aluminum connecting bar 9 for electrically connecting adjacent battery cells 3. A power supply is formed between each battery cell 3 in the front module 1 and the rear module 2 through the aluminum bar. The front module 1 and the rear module 2 form a power supply through the physical connection of the aluminum bar.

[0028] The form of the external plug-in is as follows: the front module 1 and the rear module 2 both have battery cells 3 and integrated busbars 4, the battery cells 3 of the front module 1 and the battery cells 3 of the rear module 2 are connected by connecting bars 9 to the poles of adjacent battery cells 3, and the integrated busbars 4 collect the integrated busbars 4 of the front module 1 and the rear module 2 and are connected through flexible circuit boards 5.

[0029] Ginseng Figure 3 As shown, the cells 3 inside the front module 1 and the rear module 2 are connected via a connecting bar 9 , and the connecting bar 9 inside the front module 1 and the rear module 2 is shorter than the connecting bar 9 connecting the front module 1 and the rear module 2 .

[0030] Ginseng Figure 2 As shown, the front module 1 and the rear module 2 each use an integrated busbar 4 (CCS) to electrically control and detect the corresponding battery cell 3, and the integrated busbar 4 of the front module 1 and the rear module 2 are connected by physical contact using a flexible circuit board 5. The flexible circuit board 5 is connected to the corresponding interface of the integrated busbar 4 on the front module 1 and the rear module 2 through the copper wire group fixed on the flexible sheet body in a manner such as a jumper, so as to realize the connection and communication of the controllers on the front module 1 and the rear module 2.

[0031] Ginseng Figure 1 As shown, a positioning film 6 is also included, and the positioning film 6 is coated on the integrated busbar 4 and the flexible circuit board 5 on the front module 1 and the rear module 2. The positioning film 6 is made of PET, and the integrated busbar 4 and the flexible circuit board 5 are fixed by PET to ensure that the flexible circuit board 5 in the middle is not subjected to stress.

[0032] The front module 1 and the rear module 2 are positioned by the cable tie 8 and the front and rear end plates 7, respectively. The structure is fully compatible with the existing battery cell 3 arrangement and positioning device, reducing the production cost of the device and improving the flexibility of the production line. In the process of producing the front module 1 and the rear module 2, the front module 1 and the rear module 2 can be produced separately according to the existing production line, and then the front module 1 and the rear module 2 are connected by the flexible circuit board 5, and then covered with the positioning film 6.

[0033] The configurations of the controllers of the front module 1 and the rear module 2 are the same. The controller that responds first after awakening is the main controller, and the other controller only provides the functions of collecting electrical signals and relaying electrical signals. The structure provides redundancy of the module. It is preferred that the controller that responds first is the main controller to speed up the response speed of the battery module, coordinate the work of the two controllers, return it to the existing technology of single controller control, and reduce costs. When one controller fails, the other controller takes over as the main controller.

[0034] The integrated busbar 4 is provided with collection sensors corresponding to the number of battery cells 3, and the collection sensors are arranged corresponding to the battery cells 3. In the prior art, based on the standard requirements for the impedance of the voltage sampling copper wire loop, one collection point (collection sensor) is set for two battery cells 3, which has the risk of inaccurate sampling temperature and untimely alarm. The present application reduces the impedance of the loop by thickening the cross-sectional area of ​​the sampling copper wire, thereby supporting more collection points. In another embodiment, the collection sensors on the front module 1 and the rear module 2 are connected at intervals to form several collection loops, and are respectively connected to the pins on the controller. The controller periodically receives signals from each loop, thereby achieving full collection under the existing diameter of the sampling copper wire.

[0035] The acquisition sensors of the front module 1 and the rear module 2 are electrically connected to the controllers on the front module 1 and the rear module 2 respectively, and the controllers on the front module 1 and the rear module 2 transmit the electrical signals representing the temperature through the flexible circuit board 5. The structure receives the temperature information through two controllers, so that the acquisition points on the front module 1 and the rear module 2 only need to be connected to the controllers on the front module 1 and the rear module 2, thereby reducing the length of the line and reducing the impedance of the loop. The processed electrical signals representing the numerical values ​​are directly transmitted between the controllers on the front module 1 and the rear module 2, and transmitted to the upper-level battery management system in the form of relays.

[0036] The currents provided by the front module 1 and the rear module 2 are equal. According to common knowledge, the voltages of parallel circuits are the same and the currents are cumulative, and the currents of series circuits are the same and the voltages are cumulative. The front module 1 and the rear module 2 have the same parallel group. For example, the front module 1 and the rear module 2 are both two groups of battery cells 3 in parallel. The configuration makes the currents output by the front module 1 and the rear module 2 the same. Specifically, the battery module includes two groups of battery cells 3 in parallel.

[0037] Ginseng Figure 4 As shown, the front module 1 and the rear module 2 form a dual parallel structure through the connecting row 9. Specifically, the battery cells 3 are arranged along the length direction. The connecting row 9 has four contacts, which are connected to one pole of the first to fourth battery cells 3 (assuming to be the positive pole), and the other connecting row 9 is connected to the other pole (negative pole) of the third to sixth battery cells 3…, the number of battery cells 3 is 26, and the last two battery cells 3 are connected to the positive pole through a short connecting row 9.

[0038] The present application connects two sub-modules equivalent to the existing module scale through a flexible circuit board 5, thereby merging the two modules in length. In this way, it is only necessary to set up a fire protection interface, a liquid cooling interface and an electrical connection wire on one side of the battery pack to manage the original two modules and realize single-sided door opening and back-to-back deployment of the container.

[0039] A battery pack comprises the battery modules as described above, wherein the battery modules are connected in series.

[0040] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A battery module, characterized in that: It includes a front module and a rear module, both of which have battery cells and integrated busbars, the battery cells of the front module and the battery cells of the rear module are electrically connected, and the integrated busbars of the front module and the rear module are electrically connected through a flexible circuit board.

2. A battery module according to claim 1, characterized in that: The integrated busbar is provided with collection sensors corresponding to the number of battery cells, and the collection sensors are arranged corresponding to the battery cells.

3. A battery module according to claim 2, characterized in that: The acquisition sensors of the front module and the rear module are electrically connected to the controllers on the front module and the rear module respectively, and the controllers on the front module and the rear module transmit electrical signals representing the temperature through the flexible printed circuit board.

4. A battery module according to claim 1, characterized in that: The front module and rear module position the battery cells through cable ties and front and rear end plates respectively.

5. A battery module according to claim 1, characterized in that: It also includes a positioning film, which is coated on the integrated busbar and the flexible circuit board on the front module and the rear module.

6. A battery module according to claim 1, characterized in that: The currents provided by the front module and the rear module are equal.

7. A battery module according to claim 6, characterized in that: The battery module includes two groups of parallel battery cells.

8. A battery module according to claim 1, characterized in that: The configurations of the controllers of the front module and the rear module are the same. The controller that responds first after awakening is the main controller, and the other controller only provides the functions of collecting and relaying electrical signals.

9. A battery pack, characterized in that: It comprises a plurality of battery modules as claimed in any one of claims 1 to 8, wherein the battery modules are connected in series.

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