Battery module and battery pack

Abstract

The utility model relates to a battery module and a battery pack, the battery module comprises a battery cell assembly and an acquisition assembly, the battery cell assembly comprises a plurality of battery cells, each battery cell comprises a battery cell shell and a pole, and the pole comprises an outer pole part located outside the battery cell shell; the acquisition assembly is detachably connected with the outer pole part, the acquisition assembly comprises a busbar, the busbar comprises a main convergence part and a plurality of sub convergence parts, the main convergence part extends along the thickness direction of the battery cell, and the plurality of sub convergence parts are oppositely arranged on the same side of the main convergence part at intervals; the sub-confluence part and the outer pole part are detachably connected together and are both clamping pieces, and the sub-confluence part can be clamped or separated from the outer pole part along the height direction of the battery cell. According to the utility model, the electric connection between the battery cells replaces the existing welding mode through the clamping mode, on one hand, the later disassembly and maintenance of the battery module are facilitated, the after-sale cost is reduced, on the other hand, the time loss of production line remodeling and the production time of a production line are reduced, and the production efficiency of the production line is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially is related to a battery module and battery package. BACKGROUND

[0002] Battery busbar is a kind of metal strip or metal plate used for conducting current in battery technology, usually made of copper, aluminum and other materials with good conductivity. It is called busbar or busbar, and the main function is to collect the current generated by each single battery in the battery pack and uniformly deliver to the external circuit, so as to improve the efficiency of current conduction and reduce energy loss.

[0003] In the existing product design, the electrical connection between the battery modules is usually realized by welding between the busbar and the cell pole. The above-mentioned module connection mode has the following disadvantages: 1. Different products have different welding parameters, and the product change line equipment adjustment time is long; 2. Welding requires high cleanliness of parts appearance, and the labor hours of production line are more; 3. When welding appears virtual welding and explosion point and other welding defects, the whole cell or even the module is scrapped, and the cost is high. UTILITY MODEL CONTENT

[0004] To solve the above technical problems, the utility model provides a kind of battery module and battery package, facilitate the disassembly and maintenance of battery module later period, reduce the after-sales cost, not prone to the problem of cell scrapping, reduce the time loss of production line change and production line production time, greatly improve the production efficiency of production line.

[0005] In the first aspect, the utility model provides a kind of battery module, comprising:

[0006] The cell assembly includes a plurality of cells, and the plurality of cells are arranged in sequence along the cell thickness direction. Each cell includes a cell shell and a pole, and the pole is connected to the end of the cell shell along the cell length direction. The pole includes an outer pole part located outside the cell shell.

[0007] The collection assembly is arranged on the outer side of the cell assembly along the cell length direction and is detachably connected with the outer pole part. The collection assembly includes a busbar, and the busbar includes a main busbar part and a plurality of sub-busbar parts connected at an angle with the main busbar part. The main busbar part extends along the cell thickness direction, and the plurality of sub-busbar parts are arranged on the same side of the main busbar part at a relative interval.

[0008] The sub-busbar part and the outer pole part are detachably connected together, and both are clamping pieces. The sub-busbar part can be clamped or separated from the outer pole part along the cell height direction.

[0009] Furthermore, the cross-section of the outer electrode post is an "I" shaped structure, including two snap-fit ​​grooves and a stop portion that are spaced apart from each other along the thickness direction of the battery cell. The side of the outer electrode post facing away from the battery cell housing forms a large electrode post surface. The snap-fit ​​grooves extend along the height direction of the battery cell, and the stop portion is located at the lower end of the snap-fit ​​grooves and is connected to the large electrode post surface at an angle.

[0010] The sub-bus unit includes an overlapping portion and two snap-fit ​​portions that are spaced apart from each other along the thickness direction of the battery cell. The overlapping portion and the snap-fit ​​portions are connected at an angle, and an installation gap is formed between them.

[0011] Furthermore, the cross-sectional shape of the snap-fit ​​portion corresponds to the cross-sectional shape of the snap-fit ​​groove;

[0012] When the two snap-fit ​​parts are respectively inserted into the two snap-fit ​​slots, the overlapping part contacts the large surface of the electrode post, and the lower end of the snap-fit ​​part along the height direction of the cell abuts against the stop part, so that the large surface of the electrode post is snapped into the installation gap.

[0013] Furthermore, the snap-fit ​​groove has a first snap-fit ​​groove wall located on the side of the snap-fit ​​groove closer to the battery cell housing and a second snap-fit ​​groove wall located on the side of the snap-fit ​​groove away from the battery cell housing. The snap-fit ​​part is elastic, and the snap-fit ​​part clamps the second snap-fit ​​groove wall after overcoming the elastic force.

[0014] Furthermore, the snap-fit ​​portion extends into the snap-fit ​​groove and abuts against the wall of the first snap-fit ​​groove.

[0015] Furthermore, the outer electrode portion is provided on both sides of the battery cell housing along the length direction of the battery cell;

[0016] The number of sub-buses on the busbar is at least two, and the two sub-buses are used to connect the outer pole portion on the same side of two adjacent cells.

[0017] Furthermore, the acquisition component also includes a flexible circuit board and an isolation plate. The flexible circuit board is connected to the main bus, and both the flexible circuit board and the main bus are connected to the isolation plate.

[0018] Furthermore, the main busbar is thermally riveted to the flexible circuit board, and both the main busbar and the flexible circuit board are thermally riveted to the isolation plate.

[0019] Furthermore, it also includes an end plate assembly, which includes two end plates respectively disposed on both sides of the cell assembly along the thickness direction of the cell, and the isolation plate is detachably connected to the end plates.

[0020] The utility model discloses a battery pack further, including the battery module of the first aspect.

[0021] The battery module and the battery pack provided by the utility model have the following advantages compared with the prior art: the electrical connection between the battery cells is replaced by the clamping mode instead of the existing welding mode, on the one hand, the busbar and the pole can be detachably connected, which facilitates the disassembly and maintenance of the battery module in the later period, reduces the after-sales cost, on the other hand, the operation is simple when the busbar is connected with the pole, and the battery cells are not prone to scrap, which reduces the time loss of line change and the production time of the production line, and greatly improves the production efficiency of the production line. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to make the content of the utility model more easily understood clearly, the utility model is further explained in detail below according to the specific embodiments of the utility model and in combination with the drawings.

[0023] Figure 1 The utility model discloses a battery module's structural schematic diagram;

[0024] Figure 2 The utility model discloses a battery module's structural schematic diagram; Figure 1 The utility model discloses a battery module's structural schematic diagram;

[0025] Figure 3 The utility model discloses a battery module's structural schematic diagram;

[0026] Figure 4 The utility model discloses a battery module's structural schematic diagram; Figure 3 The utility model discloses a battery module's structural schematic diagram;

[0027] Figure 5 The utility model discloses a battery module's structural schematic diagram.

[0028] The utility model discloses a battery module's structural schematic diagram. DETAILED DESCRIPTION

[0029] The utility model will be further explained in combination with the drawings and specific embodiments, so that the person skilled in the art can better understand the utility model and can be implemented, but the embodiment is not as the limitation of the utility model. Embodiment one

[0030] Refer to Figures 1 to 5As shown, one embodiment of the battery module in the utility model.

[0031] The battery module comprises:

[0032] The cell assembly comprises a plurality of cells 1 arranged in sequence along the cell thickness direction, each cell 1 comprising a cell shell 11 and a pole, the pole being connected to the end of the cell shell 11 along the cell length direction, and the pole comprising an outer pole part 12 outside the cell shell 11;

[0033] The collection assembly is arranged outside the cell assembly along the cell 1 length direction and is detachably connected with the outer pole part 12, and the collection assembly comprises a busbar 2, the busbar 2 comprising a main busbar part 21 and a plurality of sub-busbar parts 22 connected with the main busbar part 21 at an angle, the main busbar part 21 extending along the cell thickness direction, and the plurality of sub-busbar parts 22 being arranged on the same side of the main busbar part 21 at a relative interval;

[0034] The sub-busbar part 22 and the outer pole part 12 are detachably connected together, both of which are clamping pieces, and the sub-busbar part 22 can be clamped or separated from the outer pole part 12 along the cell height direction.

[0035] In the above, the cell 1 converts chemical energy into electrical energy through chemical reaction. The cell 1 mainly consists of a positive electrode, a negative electrode, a separator, an electrolyte, a cell shell and a pole. The positive electrode and the negative electrode are two polar ends of the cell, and they are separated by a separator. The separator is a thin film with ion permeability, allowing ions to pass between the two poles, but preventing direct contact between the positive and negative electrodes. The electrolyte is a liquid or solid that acts as an ion transmission medium, helping to maintain ion flow in the cell. The main function of the cell shell 11 is to contain and protect the internal battery materials, ensuring the safety and reliability of the battery. The pole refers to the part of the battery inside the positive and negative electrodes connected to the external circuit. Part of the pole extends into the interior of the cell shell 11 for connection with the positive and negative electrodes. The remaining part of the pole extends outside the cell shell 11, i.e. the outer pole part 12, for connection with the busbar.

[0036] Busbar 2 is used to connect multiple battery cells, improving the battery module's power, voltage, and current output through centralized management and control, thereby ensuring stable equipment operation. Sub-busbars 22 are connected to the outer terminal block 12, and multiple sub-busbars 22 on the same busbar are connected to the same main busbar 21, which then connects to the outside. The main busbar 21 extending along the thickness direction of the battery cell means that the length direction of the main busbar 21 is consistent with the thickness direction of the battery cell. The sub-busbar 22 being able to engage or disengage from the outer terminal block 12 along the height direction of the battery cell means that the sub-busbar 22 can engage or disengage from the outer terminal block 12 when moving along the height direction of the battery cell. Specifically, when the battery module is in use, the height direction of the cell is up and down. When the sub-busbar 22 moves downward, it clamps the outer electrode post 12. When there is no external force, the sub-busbar 22 will not detach from the outer electrode post 12. When the busbar 2 is subjected to an upward force, the sub-busbar 22 moves upward and detaches from the outer electrode post 12.

[0037] The electrical connection between battery cells is replaced by a snap-fit ​​method instead of the existing welding method. On the one hand, the busbar and the terminal post can be detachably connected, which facilitates the disassembly and maintenance of the battery module in the later stage and reduces after-sales costs. On the other hand, the connection between the busbar and the terminal post is simple to operate and is less likely to cause battery cell scrapping, which reduces the time loss of production line changeover and production line time, and greatly improves production line efficiency.

[0038] In this embodiment, the cross-section of the outer pole post 12 is an "I" shaped structure, including two snap-fit ​​grooves 122 and a stop part 123 that are arranged relatively spaced apart along the thickness direction of the cell 1. The side of the outer pole post 12 facing away from the cell housing 11 forms a pole post large surface 121. The snap-fit ​​grooves 122 extend along the height direction of the cell. The stop part 123 is located at the lower end of the snap-fit ​​grooves 122 and is connected to the pole post large surface 121 at an angle.

[0039] The sub-bus unit 22 includes an overlap portion 221 and two snap-fit ​​portions 222 that are spaced apart from each other along the thickness direction of the battery cell. The overlap portion 221 and the snap-fit ​​portions 222 are connected at an angle, and an installation gap 223 is formed between them.

[0040] In the above text, the cross-section of the outer electrode post 12 perpendicular to the height of the battery cell is an "I" shaped cross-section. The outer electrode post 12 has a top and bottom electrode post facing away from each other in the height direction of the battery cell, two side electrode posts facing away from each other in the thickness direction of the battery cell, and a large electrode post surface 121 facing away from the battery cell housing 11 in the length direction of the battery cell. The snap-fit ​​groove 122 extends through the top electrode post in the height direction of the battery cell and through the side electrode post in the thickness direction of the battery cell. A stop 123 is provided at one end of the snap-fit ​​groove 122 near the bottom electrode post. The stop 123 is used to limit the bottom of the busbar 2 during installation to prevent excessive squeezing during installation and to prevent the busbar 2 from coming out of the snap-fit ​​groove 122.

[0041] The cross section of the sub bus portion 22 in the vertical direction of the cell height is a C-shaped cross section. The lap joint portion 221 of the sub bus portion 22 is connected to the main bus portion 21. The lap joint portion 221 is substantially perpendicular to the length direction of the cell. The lap joint portion 221 is arranged on the side of the pole large surface of the outer pole portion 12. The lap joint portion 221 is attached to the pole large surface 121 to transmit current. The two ends of the lap joint portion 221 in the cell thickness direction are respectively connected to the two clamping portions 222. The two clamping portions 222 respectively extend into the two clamping grooves 122, so that the sub bus portion 22 is clamped with the outer pole portion 12. The lap joint portion 221 and the clamping portion 222 are both plate-shaped. The connection angle of the clamping portion and the lap joint portion needs to be designed in combination with the position of the corresponding clamping groove of the pole.

[0042] The outer pole portion 12 and the sub bus portion 22 are mechanically connected through the cooperation of the clamping groove 122 and the clamping portion 222, and are electrically connected through the cooperation of the lap joint portion 221 and the pole large surface 121. The stop portion 123 further enhances the stability and reliability of the connection.

[0043] In this embodiment, the cross-sectional shape of the clamping portion 222 corresponds to the cross-sectional shape of the clamping groove 122.

[0044] When the two clamping portions 222 respectively extend into the two clamping grooves 122, the lap joint portion 221 is in contact with the pole large surface 121. The lower end of the clamping portion 222 in the cell height direction is in abutment with the stop portion 123, so that the pole large surface 121 is clamped in the mounting gap 223.

[0045] The cross-sectional shape of the clamping portion 222 corresponds to the cross-sectional shape of the clamping groove 122, which is a key prerequisite for ensuring close cooperation between the two. When the two clamping portions 222 respectively extend into the two clamping grooves 122, the lap joint portion 221 is in contact with the pole large surface 121. The contact area between the two is optimized to ensure good electrical conductivity, reduce contact resistance, and reduce energy loss during charging and discharging. At the same time, the lower end of the clamping portion 222 in the cell height direction is in abutment with the stop portion 123, which stably limits the displacement of the clamping portion 222 and prevents it from moving in the cell height direction. Through such design, the pole large surface 121 is clamped in the mounting gap 223, so that the outer pole portion 12 and the sub bus portion 22 form a stable whole. The connection mode not only enhances the mechanical stability and can withstand various vibrations and impacts that the battery may be subjected to during use, but also ensures the reliability of the electrical connection, laying a solid foundation for the efficient and stable operation of the battery module.

[0046] In this embodiment, the clamping groove 122 has a first clamping groove wall 124 located on the side of the clamping groove 122 close to the battery cell shell 11 and a second clamping groove wall 125 located on the side of the clamping groove 122 away from the battery cell shell 11. The clamping portion 222 has elasticity, and the clamping portion 222 clamps the second clamping groove wall 125 after overcoming the elastic force. The clamping portion 222 abuts against the first clamping groove wall 124 after extending into the clamping groove 122.

[0047] When the clamping portion 222 is installed in cooperation with the outer pole portion 12, the second clamping groove wall 125 of the outer pole portion 12 is clamped between the clamping portion 222 and the lap joint portion 221. Because the clamping portion 222 has elasticity, it is pushed open by the second clamping groove wall 125 and then abuts against the first clamping groove wall 124 to be fixed.

[0048] When the clamping portion 222 clamps the second clamping groove wall 125, the clamping portion 222 is in an elastically deformed state. Therefore, the clamping portion 222 can be firmly fixed in the clamping groove 122 while allowing certain elastic deformation to facilitate installation and disassembly. Specifically, the elasticity of the clamping portion 222 allows it to be compressed or deformed during installation, thereby smoothly entering the clamping groove 122. Once the clamping portion 222 enters the clamping groove 122, it restores its original shape and clamps the second clamping groove wall 125, thereby ensuring the stability of the connection. By providing the clamping portion 222 with elasticity, both a firm connection and easy operation are achieved.

[0049] After the clamping portion 222 extends into the clamping groove 122, it elastically clamps the second clamping groove wall 125 and abuts against the first clamping groove wall 124. This means that the clamping portion 222 not only elastically clamps the second clamping groove wall 125, but also comes into contact or support with the first clamping groove wall 124. On the one hand, this increases the flow area, and on the other hand, it increases the friction between the clamping portion 222 and the clamping groove 122, thereby increasing the stability of the connection. Moreover, the clamping portion 222 simultaneously contacts the first clamping groove wall 124 and the second clamping groove wall 125, which can disperse the stress to both sides and improve the strength and durability of the overall structure.

[0050] In this embodiment, the battery cell shell 11 is provided with an outer pole portion 12 on each side along the length direction of the battery cell.

[0051] The number of sub-bus portions 22 on the busbar 2 is at least two, and the two sub-bus portions 22 are used to connect the outer pole portions 12 on the same side of two adjacent battery cells 1.

[0052] The outer pole portion 12 can be the positive pole or the negative pole of the battery cell, depending on the design of the battery cell. In the embodiment, each busbar 2 includes two sub-bus portions 22, the main bus portion is a strip-shaped bus plate extending along the thickness direction of the battery cell, and the two sub-bus portions 22 are connected to the same side of the strip-shaped bus plate along the width direction, forming a concave-shaped busbar structure.

[0053] In the embodiment, the above-mentioned collecting assembly further includes a flexible circuit board 3 and an isolation plate 4, the flexible circuit board 3 is connected with the main bus portion 21, and the flexible circuit board 3 and the main bus portion 21 are both connected with the isolation plate 4.

[0054] The flexible circuit board 3 plays a role of connecting each battery cell in the battery pack, realizing the electrical connection between the battery cells. It can transmit current and signals, ensuring the normal operation of the battery pack. The flexible circuit board is usually integrated with some protection and monitoring elements, which can monitor the working state of the battery in real time, and take timely protection measures when abnormal conditions occur to prevent the battery from being damaged or causing safety accidents. The flexible circuit board has good flexibility and can be bent and folded according to the shape and installation position of the battery. Its thickness is usually very thin, which can realize the connection and monitoring function of the battery without increasing the volume of the equipment.

[0055] The main function of the isolation plate 4 is to ensure the insulation and isolation between the positive and negative plates of the two battery modules, preventing the internal circuit of the battery from being short-circuited. The isolation plate 4 is an insulator itself, which has good chemical stability and electrical insulation, and good corrosion resistance.

[0056] In the embodiment, the main bus portion 21 is hot riveted with the flexible circuit board 3, and the main bus portion 21 and the flexible circuit board 3 are both hot riveted with the isolation plate 4.

[0057] Hot riveting is a process of denaturing or even melting the connection part of two metals together by increasing the temperature. The main bus portion 21, the flexible circuit board 3 and the isolation plate 4 are hot riveted, which has high connection strength, smooth surface at the connection, reduces friction and wear, and the operation process is relatively simple. Figure 5 As shown in the figure, the main bus portion 21 is provided with a hot riveting fixing hole 211 for hot riveting connection.

[0058] In the embodiment, an end plate assembly is also included, the end plate assembly includes two end plates 5, the two end plates 5 are respectively arranged on the two sides of the battery cell assembly along the thickness direction of the battery cell, and the isolation plate 4 is detachably connected with the end plates 5.

[0059] In the above, the isolation plate 4 and the end plate 5 are connected as a module outer frame, the cell assembly is arranged in the inside of the module outer frame, the two end plates 5 clamp the cell assembly, the battery module is connected as a whole, and subsequent assembly of the battery pack is facilitated. In the embodiment, the isolation plate 4 and the end plate 5 are connected through bolts, and assembly is facilitated. The detachable connection of the two end plates 5 and the isolation plate 4 of the end plate assembly provides stable mechanical support and flexible maintenance for the cell assembly, and simultaneously cooperates with the structure of the outer pole column part 12 and the sub bus part 22 to ensure the reliability and safety of the entire battery module.

[0060] A battery pack is introduced below, which comprises the battery module described above.

[0061] The battery pack is a whole unit composed of multiple battery modules combined by series and parallel connection, and multiple modules, for storing and providing electric energy. The battery pack usually comprises battery monomers, a battery management system (BMS), a thermal management system, an electrical interface and a housing, etc. The battery pack is widely used in various electronic devices and electric vehicles, including electric vehicles, energy storage systems, portable electronic devices such as Bluetooth earphones, watches, etc.

[0062] Obviously, the above embodiment is only an example for clear illustration, and is not a limitation on the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments do not need to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A battery module, characterized by, The application relates to a battery cell assembly. The battery cell assembly comprises a plurality of battery cells (1) arranged in sequence along a battery cell thickness direction, each of the battery cells (1) comprising a battery cell shell (11) and a pole, the pole being connected to an end of the battery cell shell (11) along a battery cell length direction, and the pole comprising an outer pole part (12) outside the battery cell shell (11). A collecting assembly is arranged outside the battery cell assembly along the battery cell length direction and detachably connected with the outer pole part (12), the collecting assembly comprising a busbar (2), the busbar (2) comprising a main busbar part (21) and a plurality of sub busbar parts (22) connected with the main busbar part (21) at an angle, the main busbar part (21) extending along the battery cell thickness direction, and the plurality of sub busbar parts (22) being arranged on the same side of the main busbar part (21) at a relative interval. The sub busbar part (22) and the outer pole part (12) are detachably connected together, both of which are clamping pieces, and the sub busbar part (22) can be clamped to or separated from the outer pole part (12) along a battery cell height direction.

2. The battery module of claim 1, wherein, The outer pole part (12) has a "H" shaped structure in cross section, comprising two clamping grooves (122) arranged at a relative interval along the battery cell thickness direction and a stop part (123), a pole large surface (121) being formed on a side of the outer pole part (12) away from the battery cell shell (11), the clamping grooves (122) extending along the battery cell height direction, and the stop part (123) being arranged at a lower end of the clamping grooves (122) and connected with the pole large surface (121) at an angle. The sub busbar part (22) comprises a lap part (221) and two clamping parts (222) arranged at a relative interval along the battery cell thickness direction, the lap part (221) being connected with the clamping parts (222) at an angle, and an installation gap (223) being formed between the clamping parts (222).

3. The battery module of claim 2, wherein, The cross sectional shape of the clamping part (222) corresponds to that of the clamping groove (122). When the two clamping parts (222) respectively extend into the two clamping grooves (122), the lap part (221) is in contact with the pole large surface (121), the lower end of the clamping part (222) along the battery cell height direction is in abutment with the stop part (123), so that the pole large surface (121) is clamped in the installation gap (223).

4. The battery module of claim 2, wherein, The clamping groove (122) has a first clamping groove wall (124) on a side of the clamping groove (122) close to the battery cell shell (11) and a second clamping groove wall (125) on a side of the clamping groove (122) away from the battery cell shell (11), the clamping part (222) has elasticity, and the clamping part (222) clamps the second clamping groove wall (125) after overcoming the elastic force.

5. The battery module of claim 4, wherein, The clamping part (222) abuts against the first clamping groove wall (124) after extending into the clamping groove (122).

6. The battery module of claim 1, wherein, The battery cell shell (11) is provided with the outer pole part (12) on both sides along the battery cell length direction. The number of the sub bus bars (22) on the bus bar (2) is at least two, and two sub bus bars (22) are used to connect the outer pole parts (12) on the same side of two adjacent battery cells (1).

7. The battery module of claim 1, wherein, The collecting assembly further comprises a flexible circuit board (3) and an isolation plate (4), the flexible circuit board (3) is connected with the main bus bar (21), and the flexible circuit board (3) and the main bus bar (21) are both connected with the isolation plate (4).

8. The battery module of claim 7, wherein, The main bus bar (21) is hot riveted with the flexible circuit board (3), and the main bus bar (21) and the flexible circuit board (3) are both hot riveted with the isolation plate (4).

9. The battery module of claim 7, wherein, Further comprising an end plate assembly, the end plate assembly comprises two end plates (5), the two end plates (5) are respectively arranged on the two sides of the battery cell assembly along the thickness direction of the battery cell, and the isolation plate (4) is detachably connected with the end plate (5).

10. A battery pack, characterized by, The battery module comprises the battery cell module as claimed in any one of claims 1 to 9.

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