Battery pack with high-low voltage loop structure

Abstract

The application discloses a battery pack with high-low voltage loop structure, which comprises a circuit board and a tab support, the circuit board is installed on the tab support, a total positive electrode conductive metal row of the battery cell and a total negative electrode conductive metal row of the battery cell are fixedly arranged on the tab support, a flexible acquisition circuit board fixing buckle is arranged on the tab support, and the flexible acquisition circuit board fixing buckle is clamped and fixed with a flexible acquisition circuit board; reasonable arrangement of components and connection of the conductive metal row are integrated on the circuit board, so that the problems of more electrical parts, low integration, and safety hazards of more electrical connections in the prior art scheme are solved; the total positive and negative electrode output structure is simplified, the number of conductive parts is reduced, the sealing problem caused by embedding the conductive metal row in the upper cover is avoided, and the complexity of the upper cover is reduced; the upper cover is only a pure plastic part without any insert, and the manufacturing process and the cost of the part itself are obviously reduced.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically to a battery pack employing a high- and low-voltage circuit structure. Background Technology

[0002] According to a soft-pack lithium-ion start-stop battery system disclosed in Chinese patent application CN108232079A, this low-voltage power battery system has a complex structure, low integration, many parts, and high cost; the vent is located at the top of the battery pack, and there is a circuit board separating it from the cells, without any reserved venting channel.

[0003] The 48V start-stop power supply disclosed in Chinese patent application CN207624781U has a complex structure and low space utilization. The electrical components are fixed on the mounting plate, and the high voltage main positive and negative terminals and the low voltage communication port are assembled on the top cover with independent structures, resulting in low integration and leakage risk. The bolt fixing of the base plate requires additional sealing design, which increases the cost. Due to the weight of the base plate, the leakage risk is relatively high. There is no breathable explosion-proof balance valve, resulting in low safety.

[0004] The low-voltage acquisition harness communicates with the circuit board using plug-in connection, and some plug-ins also require floating plugs to absorb assembly errors.

[0005] Therefore, the disadvantages of the existing battery pack structure are as follows:

[0006] 1. The system is complex, with many electrical components, low integration, low space utilization, high cost, and multiple electrical connections that pose safety hazards.

[0007] 2. Too many mounting points for components and housings, as well as numerous assembly points on the housing itself, can lead to a risk of leakage.

[0008] 3. Some battery packs lack ventilation and explosion-proof features, resulting in low safety.

[0009] 4. In the existing solution, the positive and negative conductive metal busbars are injection molded into the plastic cover and then connected to the internal conductive components. However, there is a sealing problem with the injection-molded conductive metal busbars.

[0010] 5. In the existing technical solution, the vent is located at the top of the battery pack, and there is a circuit board separating it from the battery cell. During the venting process, the high-temperature and high-pressure gas first damages the circuit board, causing an internal short circuit, which can easily lead to thermal runaway of the battery pack. Secondly, the high-pressure gas venting channel is blocked by the circuit board, making it difficult to quickly release the high-pressure gas, which can cause the battery pack to explode.

[0011] 6. The low-voltage acquisition harness communicates with the circuit board using plug-in connection. In order to absorb tolerances and meet assembly requirements, one side of the plug-in also needs to use a floating connector, which increases the number of parts and the cost. Summary of the Invention

[0012] The technical problem that the invention aims to solve

[0013] The technical problem to be solved by the present invention is to provide a battery pack with a high and low voltage circuit structure, which solves the problems of low safety, high cost and low quality of existing battery pack structures.

[0014] Technical solution

[0015] To solve the above problems, the technical solution provided by the present invention is as follows:

[0016] A battery pack employing a high-low voltage circuit structure includes a circuit board, an upper cover and a tab bracket that are mounted in conjunction with the circuit board, a lower housing, and a cell assembly installed within the lower housing. From top to bottom, the components are the upper cover, the circuit board, and the tab bracket. The tab bracket is mounted on the cell assembly. The lower housing is connected to the upper cover. The circuit board includes a main positive terminal and a main negative terminal. A relay control switch and a positive electrode conductive metal busbar are sequentially provided on the side of the main positive terminal. A shunt and a negative electrode conductive metal busbar are sequentially provided on the side of the main negative terminal. The circuit board also includes a low-voltage communication pin. The relay control switch and the shunt are integrated on the circuit board. The upper cover has mounting holes for the conductive metal busbars of the main positive and main negative terminals and vent holes. The tab bracket has main positive and main negative electrode conductive metal busbars for cells that correspond to and connect with the positive and negative electrode conductive metal busbars.

[0017] Furthermore, the electrode bracket is provided with a flexible acquisition circuit board fixing buckle, the flexible acquisition circuit board is fixedly engaged by the flexible acquisition circuit board fixing buckle, and the flexible acquisition circuit board is provided with only one flexible acquisition circuit board output end.

[0018] Furthermore, the circuit board is also provided with a flexible acquisition circuit board communication docking plug, which is connected to the output end of the flexible acquisition circuit board.

[0019] Furthermore, the total positive conductive metal busbar and the total negative conductive metal busbar of the battery cell are arranged on different sides of the tab support, and the electrical contact surfaces of the total positive conductive metal busbar and the total negative conductive metal busbar of the battery cell are two perpendicular surfaces.

[0020] Furthermore, the positive electrode connecting conductive metal busbar and the negative electrode connecting conductive metal busbar are selectively designed as soft conductive metal busbars.

[0021] Furthermore, a sealing and limiting groove is provided around the outer side of the mounting hole of the electrode conductive metal busbar, and a second sealing element is installed in the sealing and limiting groove.

[0022] Furthermore, the upper cover is also provided with a low-voltage communication interface, which is used to engage with the low-voltage communication pin; or the low-voltage communication interface and the low-voltage communication pin are directly disposed on the circuit board, and the upper cover is provided with a reserved hole, which is disposed at the corresponding position of the low-voltage communication interface and is used to allow the low-voltage communication interface to pass through the upper cover.

[0023] Furthermore, the upper cover is also provided with an exhaust hole, which is located on the side wall of the upper cover. The exhaust hole is located below the circuit board at the installation position of the upper cover. The exhaust hole corresponds to the installation position of the bolt-connected positive electrode conductive metal busbar and the total positive electrode conductive metal busbar of the battery cell, as well as the negative electrode-connected conductive metal busbar and the total negative electrode conductive metal busbar of the battery cell. A breathable membrane is provided inside the exhaust hole.

[0024] Furthermore, the vent hole can be used as an installation clearance hole during the assembly process to connect the total positive conductive metal busbar of the battery cell to the positive conductive metal busbar and the total negative conductive metal busbar of the battery cell to the negative conductive metal busbar.

[0025] Furthermore, the upper cover is also provided with a circuit board positioning post and a circuit board fixing structure. The circuit board fixing structure is used to fix the circuit board inside the upper cover, and the tab bracket is provided with an upper cover positioning hole that cooperates with the circuit board positioning post.

[0026] Beneficial effects

[0027] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0028] 1. The reasonable arrangement of components and the connection of conductive metal busbars are all integrated onto the circuit board, which solves the problems of the current solution having a large number of electrical components, low integration, and safety hazards due to numerous electrical connections.

[0029] 2. The overall positive and negative output structure is simplified, the number of conductive parts is reduced, the sealing problem caused by the embedded conductive metal busbar in the top cover is avoided, and the complexity of the top cover is reduced. The top cover of this solution is only a pure plastic part without any inserts, which significantly reduces the cost of manufacturing process and parts themselves.

[0030] 3. The upper cover and lower shell are connected by snap-fit, eliminating the need for bolt connections and installation, thus improving efficiency and reducing costs;

[0031] 4. The vent of this invention is located on the side of the battery pack and extends directly to the top of the battery cell, which solves the risk that the venting channel of the battery pack is blocked by the circuit board, preventing the effective discharge of high-temperature gas.

[0032] 5. Optimize by removing the plug-in at the flexible acquisition circuit board end, retaining only the non-floating plug-in at the circuit board end, making full use of the flexibility of the flexible acquisition circuit board to achieve the connection of low-voltage communication lines, thereby reducing costs. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the battery pack assembly proposed in Embodiment 1 of the present invention;

[0034] Figure 2 This is a schematic diagram of a battery pack explosion according to Embodiment 1 of the present invention;

[0035] Figure 3 This is a schematic diagram of the current flow direction proposed in Embodiment 1 of the present invention;

[0036] Figure 4 This is a schematic diagram of the upper cover proposed in Embodiment 1 of the present invention;

[0037] Figure 5 This is a schematic diagram of the electrode holder proposed in Embodiment 1 of the present invention;

[0038] Figure 6 This is a schematic diagram of the circuit board proposed in Embodiment 1 of the present invention;

[0039] Figure 7 This is a cross-sectional view of the battery pack proposed in Embodiment 1 of the present invention;

[0040] Figure 8 This is a schematic diagram of the communication docking plug structure of the flexible acquisition circuit board proposed in Embodiment 1 of the present invention;

[0041] Figure 9 This is a schematic diagram of a battery pack explosion according to Embodiment 2 of the present invention;

[0042] Figure 10 This is a schematic diagram of the low-voltage communication plug-in structure proposed in Embodiment 2 of the present invention;

[0043] Figure 11 This is a cross-sectional schematic diagram of Embodiment 2 of the present invention. Detailed Implementation

[0044] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0045] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. The terms "first," "second," etc., used in this invention are for the convenience of describing the technical solutions of the invention and have no specific limiting effect; they are all general terms and do not constitute a limitation on the technical solutions of the invention. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. In the description of this invention, 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, and are only for the convenience of describing the invention and simplifying the description, not to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict, all of which are within the scope of protection claimed by this invention.

[0046] Example 1

[0047] Combined with appendix Figure 1-7 A battery pack employing a high-low voltage circuit structure includes an upper cover 1, a circuit board 2, a tab bracket 4, a cell assembly 6, and a lower housing 3. The upper cover 1 and the lower housing 3 form an outer shell with an internal cavity. The circuit board 2, the tab bracket 4, and the cell assembly 6 are installed within the cavity formed by the upper cover 1 and the lower housing 3. The cell assembly 6 is located at the bottom and is installed within the lower housing 3. The tab bracket 4 is connected to the cell assembly 6. The tab bracket 4 is fixed and electrically connected to the cell assembly 6. The circuit board 2 is installed on the tab bracket 4. The tab bracket 4 and the upper cover 1 cooperate to synchronously limit the tab bracket 4, the circuit board 2, and the upper cover 1, ensuring perfect coordination, reducing errors, and stabilizing the battery structure. The upper cover 1 and the lower housing 3 are also fixedly connected.

[0048] The battery cell assembly 6 is composed of multiple stacked battery cells. The battery cell assembly 6 is a functional component that stores electrical energy and discharges it.

[0049] The lower housing 3 is provided with a connecting protrusion 3.1, and the upper cover 1 is provided with an upper cover fixing buckle 1.3. The upper cover fixing buckle 1.3 cooperates with the connecting protrusion 3.1 to fix the lower housing 3 and the upper cover 1. In other embodiments, the connecting protrusion 3.1 and the fixing buckle 1.3 can be replaced with other mating connection structures. A first sealing member 7 is provided at the abutment position of the lower housing 3 and the upper cover 1. The first sealing member 7 is used to make the lower housing 3 and the upper cover 1 form a sealed cavity.

[0050] The tab bracket 4 is fixedly provided with a total positive conductive metal busbar 4.1 and a total negative conductive metal busbar 4.2 of the battery cells. The tab bracket 4 is provided with a flexible acquisition circuit board fixing buckle 4.3, which engages and fixes a flexible acquisition circuit board 5. The flexible acquisition circuit board 5 is used to collect the voltage, current and temperature information of each battery cell, summarize it to a port, and the port is connected to the circuit board 2 to transmit the information to the circuit board 2 for processing. The flexible acquisition circuit board 5 is provided with a flexible acquisition circuit board output terminal 5.1 for connecting to the interface. The tab bracket 4 is provided with a top cover positioning hole 4.4, which is used for auxiliary positioning when installing the circuit board 2 and the top cover 1. In other embodiments, the tab bracket 4 can also use other methods to fix the flexible acquisition circuit board 5, as long as the flexible acquisition circuit board 5 is fixed on the tab bracket 4, that is, the flexible acquisition circuit board 5 is fixed on the tab bracket 4 by means of thread fixing, slot engagement, etc.

[0051] The connectors of the total positive conductive metal busbar 4.1 and the total negative conductive metal busbar 4.2 of the battery cell are provided with a connection structure for connection, preferably a press-fit, but welding or other methods can also be used instead. They are electrically connected to the components on the circuit board 2 through threaded engagement to form a current loop. At this time, the total positive conductive metal busbar 4.1 and the total negative conductive metal busbar 4.2 of the battery cell are electrically connected to the battery cell assembly 6. The total positive conductive metal busbar 4.1 and the total negative conductive metal busbar 4.2 of the battery cell are used as intermediate connectors for charging and discharging the battery cell assembly 6.

[0052] In a preferred embodiment, the total positive conductive metal busbar 4.1 and the total negative conductive metal busbar 4.2 of the battery cell are disposed on the side of the tab bracket 4. The installation positions of the total positive conductive metal busbar 4.1 and the total negative conductive metal busbar 4.2 of the battery cell are as close as possible to the outer edge of the tab bracket 4 to facilitate subsequent connection operations. At the same time, it is better when the total positive conductive metal busbar 4.1 and the total negative conductive metal busbar 4.2 of the battery cell are disposed on different sides of the tab bracket 4. The electrical contact surfaces of the total positive conductive metal busbar 4.1 and the total negative conductive metal busbar 4.2 of the battery cell are two perpendicular surfaces, which facilitates adjustment and absorption of manufacturing errors in the front-back and left-right directions, facilitates the layout of circuit components on the circuit board 2, and makes connection and adjustment more convenient.

[0053] The circuit board 2 includes a main positive terminal 2.1 and a main negative terminal 2.2. A relay control switch 2.6 and a positive terminal conductive metal busbar 2.3 are sequentially arranged on the side of the main positive terminal 2.1. A shunt 2.7 and a negative terminal conductive metal busbar 2.4 are sequentially arranged on the side of the main negative terminal 2.2. The circuit board 2 also includes a low-voltage communication pin 2.5 for low-voltage connection. The main positive terminal 2.1, positive terminal conductive metal busbar 2.3, and relay control switch 2.6 form the positive side circuit, providing the positive terminal to the battery cell assembly 6. The main negative terminal 2.2, negative terminal conductive metal busbar 2.4, and shunt 2.7 form the negative side circuit, providing the positive terminal to the battery cell assembly. 6 provides the negative terminal. The positive terminal is connected to the conductive metal busbar 2.3 and the total positive conductive metal busbar 4.1 of the battery cell through a connection structure. The negative terminal is connected to the conductive metal busbar 2.4 and the total negative conductive metal busbar 4.2 of the battery cell through a connection structure. The positive and negative terminal connecting copper plates and the total positive and negative conductive metal busbars of the battery cell adopt the same connection method. The preferred connection method is a press-fit threaded connection. The relay control switch 2.6 and the shunt 2.7 are integrated on the circuit board 2. Through the integrated positive and negative terminal side circuits, the shortest connection path, the smallest part volume, and the simplest assembly relationship are achieved, simplifying the structure, optimizing the layout of components, and at the same time, the current transmission line is also shorter with no unnecessary losses.

[0054] The connection within the cell assembly 6 forms two interfaces, positive and negative. The positive terminal is connected to the main positive conductive metal busbar 4.1 of the cell assembly 6, which in turn connects to the positive connecting conductive metal busbar 2.3. The positive connecting conductive metal busbar 2.3 is connected to the main positive terminal 2.1 via a relay control switch 2.6. The control relay switch 2.6 replaces the relay and is integrated onto the circuit board, allowing the circuit to be controlled via the circuit board 2. The negative terminal is connected to the main negative conductive metal busbar 4.2 of the cell assembly 6, which in turn connects to the negative connecting conductive metal busbar 2.4. The negative connecting conductive metal busbar 2.4 is connected to the main negative terminal 2.2 via a shunt 2.7. The separate shunt 2.7 is integrated onto the circuit board and can collect the circuit current, serving a detection function.

[0055] Both the main positive terminal 2.1 and the main negative terminal 2.2 are composed of a terminal base 2.1.1 and a connecting terminal 2.1.2. The terminal base 2.1.1 is fixed on the circuit board 2, and the connecting terminal 2.1.2 is inserted into the terminal base 2.1.1 to form the main positive terminal 2.1 and the main negative terminal 2.2. The connecting terminal 2.1.2 is connected to external components and serves to conduct electricity. The terminal base 2.1.1 can fix the connecting terminal 2.1.2, so that the main positive terminal 2.1 and the main negative terminal 2.2 remain stable and do not shake.

[0056] The positive electrode connecting conductive metal busbar 2.3 and the negative electrode connecting conductive metal busbar 2.4 can be selectively designed as soft conductive metal busbars according to the manufacturing precision requirements, in order to absorb assembly tolerances and ensure full contact during connection.

[0057] The conductive metal busbars mentioned in the text are preferably made of copper or aluminum, but other metals with good conductivity can also be used.

[0058] The circuit board 2 is also equipped with a flexible acquisition circuit board communication docking plug 2.8. The flexible acquisition circuit board communication docking plug 2.8 is equipped with a switch for fixing the connection components. The common choice is to push the switch to achieve a fixed connection by pressing. The flexible acquisition circuit board communication docking plug 2.8 is connected to the output terminal 5.1 of the flexible acquisition circuit board. The signal of the flexible acquisition circuit board 5 is processed by the circuit board 2. There is no plug at the output terminal 5.1 of the flexible acquisition circuit board, only an exposed pin attached to the flexible acquisition circuit board. After inserting it into the flexible acquisition circuit board communication docking plug 2.8, push the built-in switch of the flexible acquisition circuit board communication docking plug 2.8 to press it together, so that they are connected together. Using the exposed pin at one end of the flexible acquisition circuit board as the connection structure, the connection is convenient.

[0059] The flexible acquisition circuit board communication connector 2.8 is one port of the circuit on the circuit board. After the signal passes through the circuit designed by various chips and components on the circuit board 2, it is connected to the other port low-voltage communication pin 2.5. The signal of the external device is connected to the circuit board 2, thereby obtaining the relevant signals of the flexible acquisition circuit board 5 after being processed by the circuit board 2.

[0060] The upper cover 1 is provided with electrode conductive metal busbar mounting holes 1.1 corresponding to the main positive terminal 2.1 and the main negative terminal 2.2. A sealing limiting groove 1.2 is provided around the outside of the mounting holes 1.1. The electrode conductive metal busbar mounting holes 1.1 are used to insert the main positive and negative terminals respectively. A second sealing element 8 is placed in the sealing limiting groove 1.2 so that the main positive and negative terminals can remain stable when they enter the electrode conductive metal busbar mounting holes 1.1, and also has a sealing function. The upper cover 1 is also provided with a low-voltage communication interface 1.4. The low-voltage communication interface 1.4 is engaged with the low-voltage communication pin 2.5. The low-voltage communication interface 1.4 can be connected to external devices by plugging in.

[0061] The main positive terminal 2.1 and the main negative terminal 2.2 have a stepped structure, which facilitates docking with the mounting hole 1.1 and the sealing limiting groove 1.2, and also facilitates the placement of the sealing ring.

[0062] The upper cover 1 is also provided with an exhaust hole 1.5, a circuit board positioning post 1.6, and a circuit board fixing structure 1.7.

[0063] The mounting holes 1.1 and sealing limiting grooves 1.2 of the conductive metal busbars on the top cover 1 are set to correspond to the main positive and negative terminals 2.1 and 2.2 on the circuit board 2, and are inserted and fitted during installation to ensure that the main positive and negative terminals 2.1 and 2.2 can output current to the outside while also providing a sealing function.

[0064] The upper cover 1 is fixed by a buckle 1.3 and a protrusion 3.1 on the lower housing 3. The upper cover is fixed by a buckle 1.3 and a protrusion 3.1 on the lower housing 3. Both are set on both sides simultaneously to achieve a stable fixed connection.

[0065] A vent 1.5 is provided on the side of the top cover 1, and a breathable membrane is provided on the vent 1.5. The vent 1.5 is located on the side of the top cover 1, and the position of the vent 1.5 corresponds to the connection position of the positive electrode connecting conductive metal busbar 2.3 and the total positive electrode conductive metal busbar 4.1 of the battery cell, as well as the negative electrode connecting conductive metal busbar 2.4 and the total negative electrode conductive metal busbar 4.2 of the battery cell. When the battery encounters an abnormal situation that causes the internal air pressure to rise, the internal and external air pressure of the battery pack can be balanced through the vent 1.5 with the breathable membrane. After being assembled with the circuit board 2 and the tab bracket 4, the vent 1.5 is located in the side wall below the circuit board 2 and above the tab bracket 4. Therefore, the exhaust channel is not blocked by the circuit board 2, which facilitates the smooth discharge of gas appearing in the lower shell 3 when the battery encounters an abnormal situation that causes the internal air pressure to rise, and can avoid damage to the circuit board by high temperature and high pressure gas.

[0066] Additionally, the vent hole 1.5 also serves as an installation clearance hole for the connecting bolts of the total positive conductive metal busbar 4.1 and the positive connecting conductive metal busbar 2.3, as well as the total negative conductive metal busbar 4.2 and the negative connecting conductive metal busbar 2.4. During assembly, the vent hole 1.5 allows for direct fixation of the total positive conductive metal busbar 4.1 and the positive connecting conductive metal busbar 2.3, and the total negative conductive metal busbar 4.2 and the negative connecting conductive metal busbar 2.4, achieving their mating relationship and facilitating the connection of the total positive and negative conductive metal busbars with the positive and negative connecting conductive metal busbars.

[0067] The circuit board positioning post 1.6 penetrates the circuit board 2 and is finally inserted into the upper cover positioning hole 4.4 of the tab bracket 4. The circuit board 2 has a hole reserved for the circuit board positioning post 1.6 to pass through, which not only plays a positioning role for the installation of the circuit board 2, but also plays a positioning role for the installation of internal components of the upper cover 1. The circuit board fixing structure 1.7 can be connected to the circuit board 2 by bolts and fix the circuit board 2 into the upper cover 1. The circuit board fixing structure 1.7 can also be in the form of a buckle or thread, directly fixing the circuit board 2 into the upper cover 1.

[0068] Assembly process:

[0069] Step 1: Place the lower housing 3 with the opening facing upwards and insert the battery cell assembly 6. Optionally, inject an appropriate amount of thermally conductive adhesive before or after inserting the battery cell assembly 6 to fill the gaps and stabilize the battery cell assembly 6. Fill the gap between the battery cell assembly 6 and the lower housing 3 so that it will not move after installation. Install the tab bracket 4 and the flexible acquisition circuit board 5. Then, solder the battery cell assembly 6 and the tab bracket 4 in reverse order and fix the flexible acquisition circuit board 5 to form the lower housing assembly.

[0070] Step 2: Place the upper cover 1 with its inner surface facing upwards. Preferably, install the first sealing ring 7 and the second sealing ring 8 on the upper cover 1. Alternatively, the first sealing ring 7 and the second sealing ring 8 can be installed on the mating parts. Preferably, apply structural sealant, but other sealing materials can also be used. The installation of the first sealing ring 7 and the second sealing ring 8 can also be carried out in steps.

[0071] The third step involves connecting the flexible acquisition circuit board 5 in the lower housing assembly to the plug on the circuit board 2 in the upper cover 1 assembly. The flexible acquisition circuit board 5 is installed on the flexible acquisition circuit board fixing clip 4.3 of the electrode bracket 4, and the output end 5.1 of the flexible acquisition circuit board 5 is plugged into the flexible acquisition circuit board communication docking plug 2.8 of the circuit board 2. Then, the upper cover 1 is positioned and fitted onto the lower housing 3 assembly via the circuit board positioning post 1.6 and the upper cover positioning hole 4.4. The upper cover 1 is then fixed to the lower housing 3 via the upper cover fixing clip 1.3 and the connecting protrusion 3.1. At this point, the connecting holes of the positive electrode connecting conductive metal busbar 2.3 and the total positive electrode conductive metal busbar 4.1 of the battery cell, and the negative electrode connecting conductive metal busbar 2.4 and the total negative electrode conductive metal busbar 4.2 of the battery cell are aligned. Fixing bolts are installed on the outside of the upper cover 1 through the vent hole 1.5 to lock the conductive metal busbars, thus forming positive and negative electrode circuits.

[0072] Finally, after the offline test is passed, a breathable membrane is pasted at 1.5 meters from the exhaust port.

[0073] Example 2

[0074] like Figure 8-10 As shown, compared with Embodiment 1, in Embodiment 2, the low-voltage communication plug-in 2.6 and the low-voltage communication pin 2.5 are directly mounted on the circuit board 2. The upper cover 1 is provided with a reserved hole 1.9 for the low-voltage communication plug-in 2.6 to pass through. At the same time, the reserved hole on the upper cover 1 for the low-voltage communication plug-in 2.6 to pass through is provided with a third sealing element 9 to prevent leakage from the sealed cavity formed by the upper cover 1 and the lower housing 3 due to the reserved hole 1.9 of the low-voltage communication plug-in 2.6.

[0075] In Embodiment 2, the low-voltage communication interface 1.4 of the upper cover 1 in Embodiment 1 is separated and integrated with the low-voltage communication pin 2.5 on the circuit board 2 assembly to form a low-voltage communication plug 2.6, which is then soldered onto the circuit board.

[0076] Assembly process:

[0077] After the first step of Example 1, which involves the completion of the battery cell assembly 6 and the tab bracket 4, is completed, the connector in the circuit board 2 assembly is first connected to the flexible acquisition circuit board 5, and the circuit board 2 is installed onto the tab bracket 4. The positive electrode conductive metal busbar 2.3 is connected to the battery cell's total positive electrode conductive metal busbar 4.1, and the negative electrode conductive metal busbar 2.4 is connected to the battery cell's total negative electrode conductive metal busbar 4.2 by bolts. Alternatively, they can be connected by welding to form a reliable electrical connection circuit. After the electrical performance test is completed, the top cover 1 is installed, and the low-voltage communication plug 2.6 is sealed to the top cover 1 by the third sealing element 9. After the offline test is passed, a breathable membrane is pasted at the vent hole 1.5.

[0078] Through the above technical solutions, the integration of the overall structure and the arrangement and connection methods reduce the number of conductive parts and connection points, increase reliability, significantly reduce costs, and greatly improve the product's market competitiveness.

[0079] This connection arrangement is a general design method and is applicable to other products.

[0080] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A battery pack employing a high-low voltage circuit structure, characterized in that, The device includes a circuit board, a top cover and a tab bracket that are installed in conjunction with the circuit board, a lower housing, and a cell assembly installed within the lower housing. From top to bottom, the components are the top cover, the circuit board, and the tab bracket. The tab bracket is installed on the cell assembly. The lower housing is connected to the top cover. The circuit board includes a main positive terminal and a main negative terminal. A relay control switch and a positive connection conductive metal busbar are sequentially provided on the side of the main positive terminal. A shunt and a negative connection conductive metal busbar are sequentially provided on the side of the main negative terminal. The circuit board also includes a low-voltage communication pin. The relay control switch and the shunt are integrated on the circuit board. The top cover has mounting holes for the conductive metal busbars of the main positive terminal and the main negative terminal and an exhaust hole for mounting the main positive terminal and the main negative terminal. The tab bracket has a main positive terminal conductive metal busbar and a main negative terminal conductive metal busbar for corresponding to and connected to the positive connection conductive metal busbar and the negative connection conductive metal busbar. The electrode bracket is provided with a flexible acquisition circuit board fixing buckle, the flexible acquisition circuit board is fixed in place by the flexible acquisition circuit board fixing buckle, and the flexible acquisition circuit board is provided with only one flexible acquisition circuit board output end; The circuit board is also provided with a flexible acquisition circuit board communication docking plug, which is connected to the output end of the flexible acquisition circuit board. The top cover is provided with an exhaust hole on the side, and a breathable membrane is provided on the exhaust hole. The exhaust hole is located on the side of the top cover, and the position of the exhaust hole corresponds to the connection position of the positive electrode connecting conductive metal busbar and the total positive electrode conductive metal busbar of the battery cell, as well as the negative electrode connecting conductive metal busbar and the total negative electrode conductive metal busbar of the battery cell. After assembly with the circuit board and the tab bracket, the exhaust hole is in the side wall below the circuit board and above the tab bracket. In addition, the vent hole also serves as an installation clearance hole for the connecting bolts of the total positive conductive metal busbar and the positive conductive metal busbar, as well as the total negative conductive metal busbar and the negative conductive metal busbar during the assembly process. The total positive conductive metal busbar and the positive conductive metal busbar, as well as the total negative conductive metal busbar and the negative conductive metal busbar, can be directly fixed through the vent hole.

2. A battery pack employing a high-low voltage circuit structure according to claim 1, characterized in that, The total positive conductive metal busbar and the total negative conductive metal busbar of the battery cell are located on different sides of the tab support, and the electrical contact surfaces of the total positive conductive metal busbar and the total negative conductive metal busbar of the battery cell are two perpendicular surfaces.

3. A battery pack employing a high-low voltage circuit structure according to claim 2, characterized in that, The positive electrode connecting conductive metal busbar and the negative electrode connecting conductive metal busbar are selectively designed as soft conductive metal busbars.

4. A battery pack employing a high-low voltage circuit structure according to claim 1, characterized in that, A sealing and limiting groove is provided around the outside of the mounting hole of the conductive metal busbar of the pole, and a second sealing element is installed in the sealing and limiting groove.

5. A battery pack employing a high-low voltage circuit structure according to claim 1, characterized in that, The upper cover is provided with a low-voltage communication interface, which is used to engage with the low-voltage communication pin. Alternatively, the low-voltage communication interface and the low-voltage communication pin can be directly mounted on the circuit board, with a reserved hole on the top cover. The reserved hole is located at the corresponding position of the low-voltage communication interface and is used to allow the low-voltage communication interface to pass through the top cover.

6. A battery pack employing a high-low voltage circuit structure according to claim 1, characterized in that, The top cover is provided with a circuit board positioning post and a circuit board fixing structure. The circuit board fixing structure is used to fix the circuit board inside the top cover. The tab bracket is provided with a top cover positioning hole that cooperates with the circuit board positioning post.

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