Soft package battery cell power pack structure

Abstract

The utility model discloses a soft package battery cell power pack structure which comprises a plurality of battery cells arranged side by side at intervals, first buffer pieces arranged between the adjacent battery cells, an epoxy shell arranged on the outer sides of the plurality of battery cells, and a metal shell arranged on the outer side of the epoxy shell and attached to the epoxy shell, the second buffering pieces are arranged on the two sides of the epoxy shell and abut against the metal shell, and the box cover and the base are arranged at the two ends of the metal shell. According to the invention, the first buffer part is arranged between the adjacent battery cells, the epoxy shell is arranged on the outer sides of the multiple battery cells, and the second buffer parts are arranged on the two sides of the epoxy shell, so that the multiple buffer parts can perform buffer protection on the battery cells, bulge deformation caused by mutual collision of the battery cells is avoided, the epoxy shell can keep the stability of the battery cells in a severe environment, and the service life of the battery cells is prolonged. In addition, by arranging the metal shell, heat generated when the battery cell works can be rapidly conducted to the metal shell for heat dissipation, the heat dissipation effect is guaranteed, and the charging and discharging efficiency of the battery is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of soft-pack battery cells, and particularly relates to a soft-pack battery cell power pack structure. Background Art

[0002] In the current wave of the new energy industry, the batteries of electric bicycles have also been iteratively updated. Currently, the batteries on the market mainly include lead-acid batteries, nickel-metal hydride batteries, and lithium batteries. Lithium batteries are widely adopted by the market due to their small size, light weight, large capacity, and long service life. However, the current market's packaging method for lithium batteries is relatively simple, without considering the heat dissipation problem of lithium batteries, resulting in poor heat dissipation effect of lithium batteries, causing the temperature of lithium batteries to be too high during operation, reducing the charge and discharge efficiency of the battery pack. Even more seriously, it may cause a fire hazard. In addition, the current packaging strength of lithium batteries is weak. During driving or collision accidents, the internal battery cells are prone to loosening, deformation, etc., and safety accidents are likely to occur, increasing the risk of harm to passengers. Content of the Utility Model

[0003] (I) Purpose of the Utility Model

[0004] In order to overcome the above deficiencies, the purpose of the utility model is to provide a soft-pack battery cell power pack structure to solve the technical problems that the existing battery cell power pack installation structure has poor heat dissipation effect, resulting in low charge and discharge efficiency of the battery pack, and the packaging strength of the battery cell power pack installation structure is weak. During driving or collision accidents, the internal battery cells are prone to loosening, deformation, etc., and safety accidents are likely to occur.

[0005] (II) Technical Solution

[0006] To achieve the above purpose, the technical solution provided by this application is as follows:

[0007] A soft-pack battery cell power pack structure includes: multiple battery cells arranged side by side at intervals, a first buffer member arranged between adjacent battery cells, an epoxy outer shell arranged outside the multiple battery cells, a metal outer shell arranged outside the epoxy outer shell and attached to the epoxy outer shell, a second buffer member arranged on both sides of the epoxy outer shell and abutting against the metal outer shell, and a box cover and a base arranged at both ends of the metal outer shell;

[0008] In this application, a first buffer is provided between adjacent battery cells, an epoxy outer shell is provided outside multiple battery cells, and second buffers are provided on both sides of the epoxy outer shell. Multiple buffers can buffer and protect the battery cells, preventing the battery cells from colliding with each other and causing bulging and deformation. The epoxy outer shell has excellent corrosion resistance and strong tear resistance, can maintain the stability of the internal battery cells in a harsh environment, extend the service life of the battery cells. At the same time, the epoxy outer shell has strong insulation performance, which can avoid leakage. In addition, by providing a metal outer shell, the heat generated when the battery cells work can be quickly conducted to the metal outer shell for heat dissipation, ensuring the heat dissipation effect and the battery charge and discharge efficiency.

[0009] In some embodiments, it further includes: a first fiber tape that surrounds the outside of multiple battery cells and fixes the multiple battery cells together;

[0010] The multiple battery cells are bundled by the first fiber tape, preventing the battery cells from having gaps and colliding with each other to cause deformation.

[0011] In some embodiments, it further includes: a BMS battery management circuit board that is arranged between the battery cell and the box cover and is electrically connected to the battery cell.

[0012] In some embodiments, it further includes: a second fiber tape that surrounds the outside of the BMS battery management circuit board and the epoxy outer shell and is used to fix the BMS battery management circuit board to the epoxy outer shell;

[0013] The BMS battery management circuit board is fixed to the epoxy outer shell by the second fiber tape, eliminating the need to weld sheet metal parts to fix the BMS battery management circuit board and improving the assembly efficiency.

[0014] In some embodiments, it further includes: a hard pluggable connector that is arranged on the base and is electrically connected to the BMS battery management circuit board;

[0015] The hard pluggable connector can connect multiple batteries together for large-capacity power supply.

[0016] In some embodiments, it further includes: a structural adhesive layer arranged between the epoxy outer shell and the metal outer shell;

[0017] In addition to improving the firmness of the assembly and preventing risks such as the battery cells shifting and the battery cell tabs breaking during vibration, the structural adhesive layer also has a heat conduction function, conducting the heat conducted from the battery cells to the epoxy outer shell to the metal outer shell for heat dissipation.

[0018] Further, in some embodiments, it further includes: a handle arranged on the box cover;

[0019] The handle facilitates the handling of the battery. Brief Description of the Drawings

[0020] Figure 1 It is an exploded view of the soft-pack battery cell power pack structure of the present utility model;

[0021] Figure 2 It is an exploded view of the battery cell module in the soft-pack battery cell power pack structure of the present utility model;

[0022] Figure 3 It is a state diagram when multiple battery cells are stacked in the soft-pack battery cell power pack structure of the present utility model.

[0023] Reference numerals:

[0024] 01, box cover; 02, second buffer; 03, metal shell; 04, base; 05, BMS battery management circuit board; 06, adapter board; 07, battery cell; 08, epoxy shell; 09, first buffer. Detailed implementation manners

[0025] To make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below in conjunction with the specific implementation manners and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary and are not intended to limit the scope of the present utility model. In addition, in the following descriptions, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present utility model.

[0026] A soft-pack battery cell 07 power pack structure provided by the present utility model includes: multiple battery cells 07 arranged side by side at intervals, a first buffer 09 arranged between adjacent battery cells 07, an epoxy shell 08 arranged outside the multiple battery cells 07, a metal shell 03 arranged outside the epoxy shell 08 and fitting with the epoxy shell 08, second buffers 07 arranged on both sides of the epoxy shell 08 and abutting against the metal shell 03, and a box cover 01 and a base 04 arranged at both ends of the metal shell 03.

[0027] Preferably, the box cover 01 is equipped with a plastic handle for convenient battery handling. Specifically, the box cover 01 and the base 04 are plastic parts produced by an injection mold.

[0028] Preferably, the present application also has a hard pluggable connector electrically connected to the BMS battery management circuit board 05 on the base 04, which can be connected in series with other batteries to provide a battery with a larger capacity.

[0029] Specifically, multiple battery cells 07 are stacked side by side to form a battery cell module.

[0030] Specifically, the metal shell 03 can be made of aluminum metal. Since the aluminum material has a small density and a light weight, and its heat dissipation effect is excellent. In addition, it can also be made of other metal materials capable of heat conduction.

[0031] Specifically, the present application further sequentially arranges an adapter board 06 and a BMS battery management circuit board 05 between the battery cell 07 and the box cover 01. The adapter board 06 is connected to the tabs of the battery cell 07, and the BMS battery management circuit board 05 is connected to the adapter board 06. The BMS battery management circuit board 05 is a battery management system, a system for monitoring and managing the battery. By collecting and calculating parameters such as voltage, current, temperature, and SOC, it further controls the charging and discharging process of the battery, realizes the protection of the battery, and improves the management system of the comprehensive performance of the battery. Specifically, corresponding buttons are provided on the box cover 01, which are communicatively connected to the BMS battery management circuit board 05 for controlling the BMS battery management circuit board 05.

[0032] Specifically, the first buffer member 09 and the second buffer member 07 can be foam, preferably EVA foam. It has good processability and can be processed by hot pressing, cutting, gluing, bonding, etc. Secondly, EVA has good shock-proof and buffering performance, high resilience, high tensile strength, and high toughness. It can absorb and disperse external impacts through bending.

[0033] Preferably, the present application uses a first fiber tape to surround the outside of multiple battery cells 07 to fix the multiple battery cells 07 together.

[0034] Preferably, the present application uses a second fiber tape to bundle the outside of the BMS battery management circuit board 05 and the epoxy shell 08.

[0035] Preferably, the present application has a structural adhesive layer between the epoxy shell 08 and the metal shell 03.

[0036] The packaging process of the battery is as follows:

[0037] The lengths of the tabs of the battery cell 07 are cut and leveled according to actual requirements, and then series and parallel arrangements are carried out;

[0038] The first buffer member 09 is pasted between two adjacent battery cells 07. During the stacking process of the battery cells 07, ensure that the seam edges of all the battery cell 07 poles are on the same reference, and the first buffer member 09 is pasted not exceeding the four sides of the battery cell 07;

[0039] After stacking is completed, a first fiber tape is used to bundle multiple battery cells 07 to form a battery cell module;

[0040] The adapter board 06 is aligned with the tabs of the battery cell 07 and installed, and then the tabs are bent forward and backward and leveled according to the series and parallel process;

[0041] Paste the epoxy board that makes up the epoxy outer shell 08 around the battery cell module. Place the entire battery cell module into the welding positioning tooling, and use the laser welding process to weld the battery cell module. Before welding, it is necessary to tightly press the tabs of two battery cells 07 and the mounting of the adapter board 06 with a nozzle to prevent explosion during welding. After welding, check the spot welding and clean the welding slag, and complete the installation of the voltage acquisition wire harness and the NTC wire harness;

[0042] Paste the epoxy board at the top onto the battery cell module;

[0043] Use the second fiber tape to fix the BMS battery management circuit board 05 on the epoxy board at the top, and connect the positive and negative wire harnesses, communication wire harness of the battery cell module, and the wire harness of the adapter board 06 to the BMS battery management circuit board 05;

[0044] Lock the handle and the connector on the box cover 01 and the base 04 respectively, and then screw-fix the base 04 and the metal outer shell 03 to form a battery pack;

[0045] Pour a part of the structural adhesive at the bottom of the battery pack first, then put the battery cell module into the battery pack, and connect the hard pluggable connector to the BMS battery management circuit board 05;

[0046] Use the structural adhesive to fill the entire battery pack (between the epoxy outer shell 08 and the metal outer shell 03);

[0047] Lock the box cover 01 on the metal outer shell 03.

[0048] It should be understood that the above specific embodiments of the present invention are only used for exemplary illustration or explanation of the principle of the present invention, and do not constitute a limitation to the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundary of the appended claims, or equivalent forms of such scope and boundary.

Claims

1. A soft pack battery power pack structure, characterized in that: include: A plurality of battery cells (07) arranged side by side and spaced apart, a first buffer member (09) arranged between adjacent battery cells (07), an epoxy shell (08) arranged outside the plurality of battery cells (07), a metal shell (03) arranged outside the epoxy shell (08) and bonded to the epoxy shell (08), a second buffer member (02) arranged on both sides of the epoxy shell (08) and abutting against the metal shell (03), and a box cover (01) and a base (04) respectively arranged at both ends of the metal shell (03).

2. The soft-pack battery power pack structure according to claim 1, characterized in that: Also includes: A first fiber tape is wrapped around the outside of the plurality of battery cores (07) to fix the plurality of battery cores (07) together.

3. The soft-pack battery power pack structure according to claim 1, characterized in that: Also includes: A BMS battery management circuit board (05) is arranged between the battery cell (07) and the box cover (01) and is electrically connected to the battery cell (07).

4. The soft-pack battery power pack structure according to claim 3 is characterized in that: Also includes: A second fiber tape is wrapped around the BMS battery management circuit board (05) and the outside of the epoxy shell (08) to fix the BMS battery management circuit board (05) to the epoxy shell (08).

5. The soft-pack battery power pack structure according to claim 1, characterized in that: Also includes: A hard plug connector is arranged on the base (04) and is electrically connected to the BMS battery management circuit board (05).

6. The soft-pack battery power pack structure according to claim 1, characterized in that: Also includes: A structural adhesive layer is provided between the epoxy shell (08) and the metal shell (03).

7. The soft-pack battery power pack structure according to claim 1, characterized in that: Also includes: A handle is arranged on the box cover (01).

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