Battery pack

Abstract

The utility model relates to a battery pack which comprises a plurality of battery cell groups which are electrically connected, each battery cell group comprises two battery cells which are arranged in a tiled manner and a circuit connecting plate, the two battery cells are connected in series through the circuit connecting plate, and a temperature detection unit is arranged on the circuit connecting plate and is used for detecting the temperature of the two battery cells; mounting grooves in one-to-one correspondence with the battery cells are formed in the shell, and the battery cells are arranged in the mounting grooves; and the radiating fin is attached to the outer surface of the battery cell and is in contact with the shell. According to the battery pack designed by the utility model, the heat dissipation capability can be improved on the basis of light and thin design, and heat management and control can be carried out.

Description

Technical Field

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

[0002] Battery packs are mostly systems composed of cells connected in series or parallel, used to store electrical energy and release it when needed. Most current electronic products pursue a thin and light design and are equipped with fast charging capabilities. To accommodate this design, the battery packs used inside are often compressed as much as possible. This results in significant heat generation during fast charging or use, and large temperature differences between different cells. As the number of charge-discharge cycles increases, the voltage difference between cells gradually widens, leading to decreased cell consistency. This negatively impacts battery capacity, cycle life, and charge-discharge characteristics, and may even pose safety hazards. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this invention is to design a battery pack that, while maintaining a slim and lightweight design, improves heat dissipation and enables thermal management.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] Design a battery pack, including:

[0006] A plurality of electrically connected battery cell groups, each battery cell group including two battery cells arranged in a flat manner and a circuit connection board, the two battery cells being connected in series through the circuit connection board, the circuit connection board being provided with a temperature detection unit for detecting the temperature of the two battery cells;

[0007] The housing has mounting slots that correspond one-to-one with the battery cells, and the battery cells are placed in the mounting slots.

[0008] The heat sink is attached to the outer surface of the battery cell and is in contact with the housing.

[0009] This battery pack design consists of multiple sets of cells connected in parallel or series. The cells and cell groups are fixed inside the casing in a flat arrangement, increasing the contact area between the cells and the casing and thus improving heat exchange capacity. Simultaneously, heat sinks are attached between the cells and the casing, conducting heat through contact with both to further enhance heat dissipation. Furthermore, to prevent overheating, a temperature detection unit is installed on the circuit board to monitor the cell temperature and transmit the temperature signal to the battery management system. When the temperature is too high, the charging and discharging power can be controlled to reduce cell heating. Through these designs, the battery pack achieves improved heat dissipation and heat management capabilities while maintaining a slim and lightweight design.

[0010] Furthermore, the circuit connection board includes a first positive electrode, a first negative electrode, a second positive electrode, and a second negative electrode; the battery cell includes a positive electrode tab and a negative electrode tab, wherein the positive electrode tab and the negative electrode tab of one battery cell are electrically connected to the first positive electrode and the first negative electrode, respectively, and the positive electrode tab and the negative electrode tab of the other battery cell are electrically connected to the second positive electrode and the second negative electrode, respectively, and the first positive electrode and the second negative electrode are electrically connected.

[0011] The first positive electrode, the first negative electrode, the second positive electrode, and the second negative electrode can all be made of copper or aluminum to enhance the current carrying capacity. They are fixed to the substrate by welding. The connection between the battery cell's tabs and the electrode plates can be made by welding. The width of the electrode plates is designed according to the width of the battery cell's tabs to ensure the strength of the welding.

[0012] Furthermore, the circuit connection board also includes a first insulating wall and a second insulating wall, the first insulating wall being disposed between the first positive electrode and the second positive electrode, and the second insulating wall being disposed between the first negative electrode and the second negative electrode.

[0013] To enhance the insulation between the electrodes and prevent short circuits, a first insulating wall and a second insulating wall are provided on the circuit connection board. The first insulating wall and the second insulating wall can be made of insulating plastic parts or insulating ceramic parts, etc., and are fixed by attaching them.

[0014] Furthermore, the temperature detection unit includes two temperature sensing chips and two heat-conducting sheets. The two temperature sensing chips are electrically connected to the circuit layer of the circuit connection board, and the two temperature sensing chips are in contact with the first positive electrode and the second positive electrode respectively through the heat-conducting sheets.

[0015] Temperature-sensing chips typically offer higher accuracy and sensitivity than traditional thermistors, enabling more accurate sensing and measurement of the battery cell's temperature. The highest surface temperature of the battery cell usually occurs near the positive electrode; therefore, the temperature-sensing chip is preferably positioned close to the positive electrode for more accurate temperature monitoring. Furthermore, a thermally conductive sheet, preferably made of thermally conductive silicone, is placed between the temperature-sensing chip and the first and second positive electrode plates to facilitate the transfer of the battery cell's temperature to the temperature-sensing chip.

[0016] Furthermore, the circuit connection board also includes two electrode connection pieces, which are electrically connected to the second positive electrode and the first negative electrode respectively, and two adjacent battery cell groups are electrically connected through the electrode connection pieces.

[0017] The two electrode connecting pieces serve as the positive and negative terminals of the battery cell assembly, acting as an interface for electrical connection with the outside. Different battery cells can be connected in series or in parallel, that is, the electrode connecting pieces of the battery cell assembly are connected accordingly by wires.

[0018] Furthermore, the positive electrode tab and the negative electrode tab are provided with bent portions.

[0019] The tabs of the battery cell are designed with bending to ensure a certain degree of tensile toughness. Under certain vibration environments or during assembly, the tensile stress between the small tabs and the electrode is reduced by the stretching and recovery of the bending part, thereby reducing the risk of welding cracks between the tabs and the electrode.

[0020] Furthermore, the mounting groove has a first notch on the side wall near the circuit connection plate for the positive and negative electrodes to pass through.

[0021] To avoid interference between the groove wall and the tab, the groove is designed with a first notch for the positive and negative tabs to pass through. This eliminates the upward contact of the groove wall with the tab, thereby reducing the tearing stress of the tab on the welding point and reducing the risk of cracking at the welding point.

[0022] Furthermore, the housing is provided with a fixing groove, and the circuit connection board is snapped and fixed in the fixing groove.

[0023] The fixing slot is set between the mounting slots corresponding to the two cells of the cell assembly. The wall of the fixing slot is equipped with buckles to fix the circuit connection board and prevent it from shaking. This method is simple to install and disassemble and there is no risk of failure.

[0024] Furthermore, the housing includes an upper housing and a lower housing slidably connected to the upper housing.

[0025] Slide rails are provided on the two opposite side walls of the lower housing, and slide rails are provided at the corresponding positions of the upper housing. When assembling the upper and lower housings, the sliding connection is achieved directly through the cooperation structure of the slide rails and slide rails, which makes the assembly simple and efficient and helps to improve the assembly efficiency of the battery pack.

[0026] Furthermore, a second notch is provided on the side wall of the lower housing relative to the electrode connecting piece, and the electrode connecting piece extends out from the second notch.

[0027] By providing a second notch for the electrode connector to extend, it is easier for the electrode connector to be electrically connected to the external structure.

[0028] Compared with the prior art, the beneficial effects of this utility model are:

[0029] This battery pack design consists of multiple sets of cells connected in parallel or series. The cells and cell groups are fixed inside the casing in a flat arrangement, increasing the contact area between the cells and the casing and thus improving heat exchange capacity. Simultaneously, heat sinks are attached between the cells and the casing, conducting heat through contact with both to further enhance heat dissipation. Furthermore, to prevent overheating, a temperature detection unit is installed on the circuit board to monitor the cell temperature and transmit the temperature signal to the battery management system. When the temperature is too high, the charging and discharging power can be controlled to reduce cell heating. Through these designs, the battery pack achieves improved heat dissipation and heat management capabilities while maintaining a slim and lightweight design. Attached Figure Description

[0030] Figure 1 This is a structural diagram of a battery pack according to an embodiment of the present invention.

[0031] Figure 2 This is an exploded view of the battery pack in one embodiment of the present invention.

[0032] Figure 3 This is a structural diagram of a battery cell assembly according to an embodiment of this utility model.

[0033] Figure 4 This is a structural diagram of a circuit connection board according to an embodiment of the present invention.

[0034] Illustration: 1. Battery cell assembly; 11. Battery cell; 12. Circuit board; 111. Positive electrode tab; 112. Negative electrode tab; 113. Bending section; 121. Temperature detection unit; 122. First positive electrode plate; 123. First negative electrode plate; 124. Second positive electrode plate; 125. Second negative electrode plate; 126. First insulating wall; 127. Second insulating wall; 128. Electrode connecting piece; 1211. Temperature sensing chip; 1212. Heat-conducting plate; 2. Housing; 21. Mounting slot; 22. Fixing slot; 23. Upper housing; 24. Lower housing; 211. First notch; 241. Second notch; 3. Heat sink. Detailed Implementation

[0035] To facilitate understanding of this invention, a more comprehensive description will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the invention. However, this invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0036] like Figures 1 to 4 As shown, this embodiment provides a battery pack, including:

[0037] A plurality of electrically connected battery cell groups 1, each battery cell group 1 including two battery cells 11 arranged in a straight line and a circuit connection board 12, the circuit connection board 12 being located between the two battery cells 11, the two battery cells 11 being connected in series through the circuit connection board 12, the circuit connection board 12 being provided with a temperature detection unit 121 for detecting the temperature of the two battery cells 11; in this embodiment, two battery cell groups 1 are provided, in other possible embodiments the number of battery cell groups 1 may be different, this embodiment does not make a specific setting.

[0038] The housing 2 has mounting slots 21 that correspond one-to-one with the battery cells 11, and the battery cells 11 are placed in the mounting slots 21.

[0039] Heat sink 3 is attached to the outer surface of battery cell 11 and contacts the housing 2. The size of heat sink 3 is the same as the surface size of battery cell 11. Heat sink 3 can be in the form of double-sided adhesive or single-sided adhesive. Heat sink 3 with double-sided adhesive can fix battery cell 11 in mounting slot 21. Heat sink 3 can be made of graphene film. Graphene is a new nanomaterial with a single-layer sheet structure composed of carbon atoms. It is the almost perfect planar atomic structure discovered so far. Compared with three-dimensional materials, its low-dimensional structure can significantly reduce the boundary scattering of phonons at grain boundaries, giving it rapid thermal conductivity and heat dissipation.

[0040] The battery pack provided in this embodiment consists of multiple sets of battery cells 1 connected in parallel or series. The battery cells 11 are fixed inside the housing 2 in a flat arrangement, increasing the contact area between the battery cells 11 and the housing 2, thereby improving the heat exchange capacity. Simultaneously, a heat sink 3 is attached between the battery cells 11 and the housing 2, and the heat sink 3 conducts heat in contact with the battery cells 11 and the housing 2, further improving the heat dissipation capacity. Furthermore, to prevent overheating, a temperature detection unit 121 is provided on the circuit connection board 12 to detect the temperature of the battery cells 11 and transmit the temperature signal to the battery management system. When the temperature is too high, the charging and discharging power can be controlled to reduce cell heating. Through the above design, the battery pack achieves improved heat dissipation and control capabilities while maintaining a slim and lightweight design.

[0041] like Figure 3 and Figure 4As shown, the circuit connection board 12 includes a first positive electrode 122, a first negative electrode 123, a second positive electrode 124, and a second negative electrode 125; the battery cell 11 includes a positive electrode tab 111 and a negative electrode tab 112, wherein the positive electrode tab 111 and the negative electrode tab 112 of one battery cell 11 are electrically connected to the first positive electrode 122 and the first negative electrode 123 respectively, and the positive electrode tab 111 and the negative electrode tab 112 of the other battery cell 11 are electrically connected to the second positive electrode 124 and the second negative electrode 125 respectively, and the first positive electrode 122 and the second negative electrode 125 are electrically connected. The first positive electrode 122, the first negative electrode 123, the second positive electrode 124, and the second negative electrode 125 on the circuit connection plate 12 are fixed by welding. These electrodes can be made of copper or aluminum to enhance current carrying capacity. The connection between the tabs and electrodes of the battery cell 11 can also be welded. The width of the electrodes is designed according to the width of the tabs of the battery cell 11 to ensure the strength of the weld. To enhance the insulation between the electrodes and prevent short circuits, a first insulating wall 126 and a second insulating wall 127 are provided on the circuit connection plate 12. The first insulating wall 126 is located between the first positive electrode 122 and the second positive electrode 124, and the second insulating wall 127 is located between the first negative electrode 123 and the second negative electrode 125. The first insulating wall 126 and the second insulating wall 127 can be made of insulating plastic or insulating ceramic, etc., and are fixed by attachment.

[0042] like Figure 3 and Figure 4 As shown, the temperature detection unit 121 includes two temperature-sensing chips 1211 and two heat-conducting sheets 1212. The two temperature-sensing chips 1211 are electrically connected to the circuit layer of the circuit connection board 12, and the two temperature-sensing chips 1211 are in contact with the first positive electrode 122 and the second positive electrode 124 respectively through the heat-conducting sheets 1212. The temperature-sensing chips 1211 typically have higher accuracy and sensitivity than traditional thermistors, enabling them to more accurately sense and measure the temperature of the battery cell. The highest surface temperature of the battery cell 11 usually occurs near the positive electrode of the battery cell 11. The temperature-sensing chips 1211 are preferably located near the positive electrode of the battery cell 11, which allows for more accurate monitoring of the temperature of the battery cell 11. In addition, the heat-conducting sheets 1212 are provided between the temperature-sensing chips 1211 and the first positive electrode 122 and the second positive electrode 124. The heat-conducting sheets 1212 can be made of thermally conductive silicone to facilitate the transfer of the temperature of the battery cell 11 to the temperature-sensing chips 1211.

[0043] like Figure 4As shown, the circuit connection board 12 also includes two electrode connection pieces 128. The two electrode connection pieces 128 are electrically connected to the second positive electrode piece 124 and the first negative electrode piece 123, respectively. Adjacent battery cell groups 1 are electrically connected through the electrode connection pieces 128. The two electrode connection pieces 128 serve as the positive and negative electrodes of the battery cell group 1, acting as interfaces for electrical connection with external components. Different battery cells can be connected in series or in parallel, that is, the electrode connection pieces 128 of the battery cell group 1 are connected accordingly through wires.

[0044] like Figure 2 and Figure 3 As shown, the positive tab 111 and negative tab 112 of the battery cell 11 are provided with bending portions 113. The bending design of the tabs of the battery cell 11 ensures a certain tensile toughness. Under certain vibration environments, the tensile stress between the tab and the electrode is reduced by the tensile recovery of the bending portion 113, thereby reducing the risk of welding cracks between the tab and the electrode. To avoid interference between the groove wall of the mounting groove and the tab, the side wall of the mounting groove 21 near the circuit connection plate 12 is provided with a first notch 211 for the positive tab 111 and negative tab 112 to pass through. This eliminates the upward contact of the groove wall with the tab, thereby reducing the tearing stress of the tab on the welding point and further reducing the risk of welding point cracks.

[0045] like Figure 2 As shown, the housing 2 has a fixing groove 22, and the circuit connection plate 12 is snapped and fixed in the fixing groove 22. The fixing groove 22 is set between the mounting grooves 21 corresponding to the two cells 11 of the cell group 1. The groove wall of the fixing groove 22 is provided with a buckle, which fixes the circuit connection plate 12 to prevent it from shaking. This method is simple to install and disassemble and there is no risk of failure. The housing 2 includes an upper housing 23 and a lower housing 24 that is slidably connected to the upper housing 23. Slides are provided on two opposite side walls of the lower housing 24, and slide rails are provided at corresponding positions on the upper housing 23. When assembling the upper housing 23 and the lower housing 24, the sliding connection is directly achieved through the cooperation structure of the slide rails and slides, which is simple and efficient and helps to improve the assembly efficiency of the battery pack. A second notch 241 is opened on the side wall of the lower housing 24 opposite to the electrode connection piece 128. The electrode connection piece 128 extends out from the second notch 241, which facilitates the electrical connection between the electrode connection piece 128 and the external structure.

[0046] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0047] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, the inclusion of "first," "second," etc., in a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A battery pack, characterized in that, include: A plurality of electrically connected battery cell groups, each battery cell group including two battery cells arranged in a row and a circuit connection board, the two battery cells being connected in series through the circuit connection board, the circuit connection board being provided with a temperature detection unit for detecting the temperature of the two battery cells; The housing has mounting slots that correspond one-to-one with the battery cells, and the battery cells are placed in the mounting slots. The heat sink is attached to the outer surface of the battery cell and is in contact with the housing.

2. The battery pack according to claim 1, characterized in that, The circuit connection board includes a first positive electrode, a first negative electrode, a second positive electrode, and a second negative electrode; the battery cell includes a positive tab and a negative tab, wherein the positive tab and the negative tab of one battery cell are electrically connected to the first positive electrode and the first negative electrode, respectively, and the positive tab and the negative tab of the other battery cell are electrically connected to the second positive electrode and the second negative electrode, respectively, and the first positive electrode and the second negative electrode are electrically connected.

3. The battery pack according to claim 2, characterized in that, The circuit connection board further includes a first insulating wall and a second insulating wall, the first insulating wall being disposed between the first positive electrode and the second positive electrode, and the second insulating wall being disposed between the first negative electrode and the second negative electrode.

4. The battery pack according to claim 2, characterized in that, The temperature detection unit includes two temperature sensing chips and two heat-conducting sheets. The two temperature sensing chips are electrically connected to the circuit layer of the circuit connection board, and the two temperature sensing chips are in contact with the first positive electrode and the second positive electrode respectively through the heat-conducting sheets.

5. The battery pack according to claim 2, characterized in that, The circuit connection board also includes two electrode connection pieces, which are electrically connected to the second positive electrode and the first negative electrode, respectively, and adjacent battery cell groups are electrically connected through the electrode connection pieces.

6. The battery pack according to claim 2, characterized in that, The positive electrode tab and the negative electrode tab are provided with bent portions.

7. The battery pack according to claim 2, characterized in that, The mounting slot has a first notch on the side wall near the circuit connection plate for the positive and negative electrodes to pass through.

8. The battery pack according to claim 1, characterized in that, The housing is provided with a fixing groove, and the circuit connection board is snapped and fixed in the fixing groove.

9. The battery pack according to claim 5, characterized in that, The housing includes an upper housing and a lower housing that is slidably connected to the upper housing.

10. The battery pack according to claim 9, characterized in that, The side wall of the lower housing has a second notch at a position opposite to the electrode connecting piece, and the electrode connecting piece extends out from the second notch.

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