A battery pack structure

Abstract

The utility model discloses a battery package structure, including box body and electric core, be provided with several groups of electric core group in the box body, each electric core group is by same number of several electric cores mutual electric connection, and the electric core in each electric core group uses the conductive row through Z type connection's mode mutual series connection, and the electric core group that is equipped in the box body is set with steel tie in top to further consolidate the installation position, and the front and back of each electric core is provided with the foam, the utility model discloses the steel tie of being equipped with, it can be to the electric core group installation position's fixed position, and can absorb the expansion force that the electric core generates after long -term circulation, and then the external contour of electric core is restricted, avoids the end plate and other components from being damaged due to expansion, and additionally still use the conductive row of Z type design, and this structure can unify the assembly direction of electric core, reduce the influence of copper row internal resistance to voltage sampling, improve copper row heating, make installation convenient and make life, reliability and safety get the promotion.

Description

Technical Field

[0001] This utility model belongs to the field of battery pack technology, and in particular relates to a battery pack structure. Background Technology

[0002] Battery packs typically house battery modules inside a battery case to secure the modules, thereby reducing vibration and impact and ensuring proper operation of the battery pack.

[0003] When battery packs are used in harsh environments such as vehicles, the installation of battery modules requires high structural strength of the sheet metal parts at the upper end of the battery modules. Especially after prolonged vibration and impact, the battery modules may not be able to fit securely with the battery box, and the battery modules may shake inside the battery box, affecting the normal operation of the battery pack. Utility Model Content

[0004] In view of the problems existing in the prior art, the purpose of this utility model is to provide a battery pack structure.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] A battery pack structure includes a housing and battery cells, characterized in that: a plurality of battery cell groups are arranged inside the housing; each battery cell group is composed of the same number of battery cells electrically connected to each other; the battery cells in each battery cell group are connected in series with each other by means of conductive busbars in a Z-shaped connection; each battery cell group installed in the housing is provided with a steel cable tie at the top to further reinforce the installation position; and foam is provided on the front and back of each battery cell.

[0007] Preferably, a thermal runaway sensor is installed inside the enclosure, and thermal runaway detection is performed by the BMS that works in conjunction with the battery pack for alarm and protection.

[0008] Preferably, several liquid cooling plates are arranged horizontally inside the housing, and the liquid cooling plates are vertically arranged between the battery cells.

[0009] Preferably, each of the liquid cooling plates is equipped with a separate input interface and an output interface, and the input interface and output interface of each liquid cooling plate are connected to the main output port and the main input port through connecting pipes.

[0010] Preferably, the conductive busbar is designed with a Z-shaped structure and consists of three parts: a first aluminum conductive busbar, a copper conductive busbar, and a second aluminum conductive busbar.

[0011] Preferably, the first aluminum conductive bus and the second aluminum conductive bus are welded to the front and rear ends of the copper conductive bus, respectively.

[0012] Preferably, the copper busbar is made of a copper alloy, which is made of copper, silver and chromium in a certain proportion.

[0013] Preferably, the surface of the copper busbar is electroplated with a nickel layer.

[0014] Beneficial effects of this utility model

[0015] Compared with existing technologies, the advantages of this utility model are:

[0016] This invention uses steel cable ties to fix the battery cell assembly installed inside the housing. This structural design can ensure the strength and stability of the installation, thereby improving the problem of unstable battery cell assembly installation in current battery packs. More importantly, it can also absorb the expansion force generated by the battery cell after long-term cycling, which can constrain the outer contour of the battery cell and prevent the battery cell expansion from causing damage to the end plate and other components.

[0017] This utility model is equipped with a thermal runaway sensor, which monitors the pressure, electrolyte concentration, and CO concentration inside the battery pack in real time, so as to detect abnormalities in the battery cell group in a timely manner, issue alarms and cut off the circuit to protect the safety of passengers.

[0018] The battery cells of this invention are connected in series in a Z-shaped manner. The advantages of this design are that it can improve thermal management and the uniformity of current distribution, unify the assembly direction of the battery cells, and allow two adjacent battery cells to be connected by an integrated short conductive busbar. This reduces the influence of the internal resistance of the conductive busbar on voltage sampling, improves the heat generation of the conductive busbar, and enhances the ease of installation, service life, reliability, and safety.

[0019] To achieve a Z-shaped connection between battery cells, the conductive busbar of this invention is designed in a Z-shape. It consists of three parts: a first aluminum conductive busbar, a copper conductive busbar, and a second aluminum conductive busbar. Using the aluminum conductive busbar as one of the connecting materials can effectively reduce production costs. Furthermore, fixing the aluminum conductive busbar to both ends of the copper conductive busbar can effectively improve the conductivity of the conductive busbar. In addition, the surface of the conductive busbar is electroplated with a nickel layer. The nickel layer not only reduces contact resistance and improves heat dissipation, but also enhances the corrosion resistance and oxidation resistance of the conductive busbar, preventing poor contact due to oxidation and electro-corrosion, and eliminating safety hazards. Attached Figure Description

[0020] Figure 1 This is an assembly drawing of the present utility model.

[0021] Figure 2 This is a schematic diagram of the battery cell assembly of this utility model inside the casing.

[0022] Figure 3This is a schematic diagram of the battery cell assembly and steel cable tie of this utility model.

[0023] Figure 4 This is a schematic diagram of the battery cell assembly of this utility model.

[0024] Figure 5 This is a schematic diagram of the assembly of the liquid cooling plate and the housing of this utility model.

[0025] Figure 6 This is a partially enlarged schematic diagram of the conductive busbars used between the battery cells of this utility model.

[0026] Figure 7 This is a schematic diagram of the structure of the conductive bus of this utility model.

[0027] Figure 8 This is a partially enlarged schematic diagram showing the location of the thermal runaway sensor of this utility model. Detailed Implementation

[0028] To better understand the purpose, structure, and function of this utility model, a more detailed description of this utility model is provided below with reference to the accompanying drawings.

[0029] like Figures 1 to 8 As shown, a battery pack structure of this utility model mainly includes a battery cell assembly (10) disposed inside the casing. The general structure of this utility model is as follows:

[0030] The housing contains several sets of battery cell groups (10); each set of battery cell groups (10) consists of the same number of battery cells (1) electrically connected to each other; the battery cells (1) in each set of battery cell groups (10) are connected in series with each other by means of conductive busbars (3) in a Z-shaped connection; each set of battery cell groups (10) installed in the housing is provided with steel cable ties (2) on the top to further reinforce the installation position; each battery cell (1) is provided with foam on the front and back.

[0031] It is important to emphasize the conductive bus (3). The conductive bus (3) is designed with a Z-shaped structure. The purpose of this design is to enable Z-shaped electrical connection between the battery cells (1). The Z-shaped connection can improve the uniformity of thermal management and current distribution, unify the assembly direction of the battery cells (1), and enable two adjacent battery cells (1) to be connected by a short conductive bus (3). This structure and connection method can reduce the influence of the internal resistance of the copper bus on voltage sampling, improve the heating of the copper bus, and improve the ease of installation, service life, reliability and safety. The same design with similar advantages is the conductive bus (3). The conductive bus (3) can be further explained as being composed of three parts: a first aluminum conductive bus (31), a copper conductive bus (32), and a second aluminum conductive bus (33). The first aluminum conductive bus (31) and the second aluminum conductive bus (33) are respectively welded to the front and rear ends of the copper conductive bus (32). The copper conductive bus (32) is made of a copper alloy, which is composed of copper, silver, and chromium in a specific ratio. The surface of the copper conductive bus (32) is electroplated with a nickel layer. The electroplated nickel layer serves two purposes: first, it reduces contact resistance, improves heat dissipation through radiation, and enhances the conductive bus's resistance to corrosion and oxidation, preventing poor contact due to oxidation and electro-corrosion, thus eliminating safety hazards; second, it serves as a transition layer for welding the aluminum conductive bus, as aluminum easily forms an oxide film, increasing the difficulty of welding.

[0032] In addition, the box is equipped with a thermal runaway sensor (5). The thermal runaway sensor monitors the pressure, electrolyte concentration and CO concentration in the battery pack in real time, so as to detect abnormalities in the battery cell group (10) in time, and issue an alarm and cut off the circuit to protect the safety of passengers.

[0033] Furthermore, several liquid cooling plates (4) are arranged horizontally inside the box. The liquid cooling plates (4) are vertically arranged between the battery cells (1). Each liquid cooling plate (4) is equipped with a separate input interface and output interface. The input interface and output interface of each liquid cooling plate (4) are connected to the main output port and the main input port through connecting pipes. This structural design can ensure that the cooling plate contacts each battery cell (1) for heat dissipation while saving space and avoiding the space occupied by the extra pipe laying.

[0034] It is worth mentioning that, in order to solve the problems mentioned in the background technology and to ensure that the multi-component battery cell assembly (10) can be stably installed in the box, this utility model uses steel cable ties (2) to fix the battery cell assembly (10) installed in the box. This structural design can ensure the strength and stability of the installation, thereby improving the problem of unstable installation of the battery cell assembly (10) in the current battery pack. More importantly, it can also absorb the expansion force generated by the battery cell (1) after long-term cycling, which can constrain the outer contour of the battery cell (1) and prevent the expansion of the battery cell (1) from causing damage to the end plate and other components.

[0035] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A battery pack structure, comprising a housing and battery cells (1), characterized in that, The housing contains several sets of battery cell groups (10); each set of battery cell groups (10) consists of the same number of battery cells (1) electrically connected to each other; the battery cells (1) in each set of battery cell groups (10) are connected in series with each other by means of conductive busbars (3) in a Z-shaped connection; each set of battery cell groups (10) installed in the housing is provided with steel cable ties (2) on the top to further reinforce the installation position; each battery cell (1) is provided with foam on the front and back.

2. The battery pack structure according to claim 1, characterized in that, The enclosure is equipped with a thermal runaway sensor (5), which is used by the BMS that works in conjunction with the battery pack to detect thermal runaway and provide alarm and protection.

3. The battery pack structure according to claim 1, characterized in that, Several liquid cooling plates (4) are arranged horizontally inside the box, and the liquid cooling plates (4) are arranged vertically between the battery cells (1).

4. The battery pack structure according to claim 3, characterized in that, Each of the liquid cooling plates (4) is equipped with a separate input interface and output interface, and the input interface and output interface of each liquid cooling plate (4) are connected to the main output port and the main input port through connecting pipes.

5. A battery pack structure according to claim 1, characterized in that, The conductive bus (3) is designed in a Z-shape and consists of three parts: a first aluminum conductive bus (31), a copper conductive bus (32), and a second aluminum conductive bus (33).

6. A battery pack structure according to claim 5, characterized in that, The first aluminum conductive bus (31) and the second aluminum conductive bus (33) are respectively welded to the front and rear ends of the copper conductive bus (32).

7. A battery pack structure according to claim 5, characterized in that, The copper busbar (32) is made of copper alloy, which is made of copper, silver and chromium in proportion.

8. A battery pack structure according to claim 5, characterized in that, The copper busbar (32) is electroplated with a nickel layer.

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