Energy storage battery based on side current collecting lead-out sheet

Abstract

The application discloses a kind of energy storage batteries based on side current collection lead-out sheet, it is characterized in that, including battery package box, battery module;The battery package box adopts plastic material, inner cavity is integral cavity structure;Battery module is separated with baffle, and the compressible buffer block is set in the both ends of battery module;The battery module includes pole, end plate, polar plate;Polar plate is vertically placed, positive plate is wrapped with diaphragm bag, and diaphragm welding is used to fix positive plate;Polar plate both sides are connected lead-out sheet by roll welding respectively, lead-out sheet includes positive lead-out sheet, negative lead-out sheet;Pole is welded with lead-out sheet;Adjacent battery module is connected by lead-out sheet, and multiple battery modules are welded to form an integral whole.The positive plate of the application is packaged with diaphragm bag, reduces the micro short circuit caused by polar plate powder drop, and battery package assembly is simple, large current performance is good, and the working life is long.

Description

Technical Field

[0001] This invention relates to the field of energy storage battery technology, and more specifically to an energy storage battery based on a side current collector. Background Technology

[0002] Currently, nickel-metal hydride hybrid energy storage systems are widely used in high-capacity, high-rate applications. Nickel-metal hydride batteries, as the main component of these systems, need to meet the requirements of high-capacity, high-power discharge. Considering material and installation costs, the capacity of a single battery pack needs to be large, and the size of its plates also needs to be correspondingly increased. To reduce the cost of external mounting components, heat dissipation, and the outer casing, the aspect ratio of the battery pack is generally around 2:1. However, current battery modules typically use a common method of current collection at the top of the plates. This method increases the difference in operating current between the upper and lower parts of the elongated plates, making them prone to performance degradation.

[0003] Furthermore, in existing battery packs, the tabs of each plate are led out and then uniformly connected to the terminal post. For large-capacity battery packs, the connection path of the edge plates that are far from the terminal post is long, which leads to increased internal resistance of the edge plates and high cost of connection materials. At the same time, the difference in charging and discharging current caused by the difference in internal resistance between the edge plates and the middle plates will also lead to the degradation of plate performance. Moreover, most of the leads adopt the front current collection method and are connected in a simple single shape, which causes the internal resistance to change over a long period of time.

[0004] Furthermore, the voltage and capacity changes of current energy storage systems can only be achieved by adjusting the size and number of battery packs, and the corresponding external mounting and fixing structures also need to be adjusted, resulting in poor versatility. Summary of the Invention

[0005] In view of the above-mentioned problems in the prior art, in order to solve the above technical problems, the present invention provides an energy storage battery based on side current collectors. The side current collectors adopt a fish-scale stacked structure and a threaded coil alternating connection structure to reduce the difference in internal resistance of the plates. The energy storage battery based on side current collectors of the present invention includes a battery pack housing and a battery module.

[0006] The battery pack housing is made of plastic, and the inner cavity is an integral hollow structure; the battery pack housing is connected to the housing cover by ultrasonic welding.

[0007] The battery modules are separated by partitions, and compressible buffer blocks are provided at both ends of the battery modules;

[0008] The battery module includes terminals, end plates, and plates; the plates are placed vertically, and the positive plate is wrapped with a diaphragm bag to reduce micro-short circuits caused by powder shedding from the plate, and the positive plate is fixed by diaphragm welding to prevent it from detaching.

[0009] Leads are connected to both sides of the electrode plate by roll welding. The leads include positive and negative leads. The terminals are welded to the leads. Current collectors are drawn from the side of the electrode plate to alleviate the degradation process of the electrode plate. The side current collectors adopt a fish-scale stacked and threaded coil alternating connection structure to reduce the difference in internal resistance of the electrode plate. Leads are roll welded to the long side of the electrode plate. According to the interconnection method of the battery modules, the leads of each battery module are uniformly tilted in a certain direction. The leads are stacked in a fish-scale stack and threaded coil alternating connection. Adjacent battery modules are connected by leads, and multiple battery modules are welded together to form a whole.

[0010] Preferably, the battery pack housing is fixed by a reinforced metal frame and reinforced by side reinforcing ribs, which are snapped onto both sides of the battery pack housing.

[0011] Preferably, the adjacent battery modules are connected by lead-out tabs, including: when the battery modules are located on both sides, the battery modules located on both sides are welded to the adjacent battery modules in the same direction by lead-out tabs, the lead-out tabs are bent in the same direction, and narrow partitions are used between the battery modules;

[0012] When the battery module is in the middle, adjacent battery modules are welded together by lead-out tabs, and the lead-out tabs are bent in opposite directions. Wide partitions are used between modules.

[0013] Preferably, the buffer block is attached to the side of the battery module with tape and is adjacent to the terminal post; the electrode plates are stacked as positive and negative electrode plates.

[0014] Preferably, the battery pack housing is also provided with an explosion-proof valve and a temperature probe mounting hole.

[0015] Preferably, the two sides of the electrode plate are connected by roll welding to lead sheets, including: the lead sheets of each battery module are uniformly tilted in the same direction, and the lead sheets are stacked in a fish scale pattern.

[0016] Preferably, the interconnection between the electrode plates and the lead-out pieces, the connection between the lead-out pieces of the battery modules, and the connection between the terminals and the lead-out pieces are all achieved by one-time laser welding.

[0017] This invention provides an energy storage battery based on a side current collector, which achieves the following beneficial technical effects:

[0018] 1. The positive electrode plate is sealed with a diaphragm bag to reduce micro-short circuits caused by electrode powder shedding; the electrode plate is placed vertically, and to avoid micro-short circuits caused by powder shedding and short circuits caused by misalignment during electrode plate assembly, the positive electrode plate is wrapped with a diaphragm bag and the diaphragm is welded to prevent the positive electrode plate from detaching.

[0019] 2. The current collector is changed from being drawn from the top surface of the electrode to being drawn from the side, which slows down the deterioration process of the electrode.

[0020] 3. The side current collector leads adopt a fish-scale stacked structure and an alternating threaded coil connection structure to reduce the difference in internal resistance of the plates and reduce connection costs; the leads on the side (long side) of the plates are roll-welded. According to the interconnection method of the battery modules, the leads of each battery module are uniformly tilted in a certain direction. The leads are arranged in a fish-scale stacked and alternating threaded coil connection structure. The interconnection of the plate leads, the connection of the leads between battery modules, and the connection between the terminals and the leads are all done by one-time laser welding.

[0021] 4. The battery pack is designed with an integral cavity. Individual battery modules are separated by partitions. Under the premise that the overall length does not exceed the inner cavity of the battery box, the battery modules can be connected into a battery pack in different arrangements to output different capacities and voltages. The battery modules are separated by partitions. After multiple battery modules are welded together, compressible buffer blocks are set at both ends of the battery modules to reserve a small amount of space for the expansion and deformation of the plates.

[0022] 5. To prevent the box from deforming due to the expansion of the electrode plates after deterioration, reinforcing ribs have been added to the sides of the box, and the exterior of the box is reinforced with a metal frame structure.

[0023] 6. The battery pack of the present invention is simple to pack, has good high-current performance, low internal resistance, and long service life. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a finished energy storage battery based on a side current collector lead-out sheet according to the present invention.

[0026] Figure 2 This is a schematic diagram of a 3-cell battery module for energy storage based on a side current collector lead-out sheet, according to the present invention.

[0027] Figure 3 This is a schematic diagram of a two-cell battery module for energy storage based on a side current collector lead-out sheet, according to the present invention.

[0028] Figure 4 This is a schematic diagram of a reinforced metal frame for an energy storage battery box based on a side current collector lead-out sheet, according to the present invention.

[0029] Figure 5 This is a schematic diagram of a battery pack cover for an energy storage battery based on a side current collector lead-out sheet, according to the present invention.

[0030] Figure 6 This is a schematic diagram of a side reinforcing rib of an energy storage battery box based on a side current collector lead-out sheet, according to the present invention.

[0031] Figure 7 This is a schematic diagram of an energy storage battery separator based on a side current collector lead-out sheet according to the present invention.

[0032] Figure 8 This is a schematic diagram of an energy storage battery buffer block based on a side current collector lead-out sheet according to the present invention.

[0033] Figure 9 This is a schematic diagram of an energy storage battery terminal based on a side current collector lead-out sheet according to the present invention.

[0034] Figure 10 This is a schematic diagram of an energy storage battery end plate based on a side current collector lead-out sheet according to the present invention.

[0035] Figure 11 This is a schematic diagram of an energy storage battery module based on a side current collector lead-out sheet according to the present invention.

[0036] Figure 12 This is a schematic diagram of the electrode post connection of the lead plate of an energy storage battery based on the side current collector lead plate according to the present invention.

[0037] Figure 13 This is a schematic diagram of the co-directional welding of adjacent battery module lead-out sheets according to the present invention.

[0038] Figure 14 This is a schematic diagram of the welding of adjacent battery module lead-out sheets of the present invention, which adopts a fish-scale stacked structure and an alternating threaded coil connection structure.

[0039] Figure 15 This is a schematic diagram of the 5-cell battery module structure of the present invention.

[0040] Figure 16 This is a schematic diagram of the positive and negative electrode plate stacking structure of the present invention.

[0041] Figure 17 This is a schematic diagram of the electrode lead-out sheet structure of the present invention. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] This invention addresses the aforementioned technical challenges by providing a new energy storage battery based on side current collectors. The side current collectors employ a fish-scale stacked structure with alternating threaded connections to reduce differences in internal resistance between the plates. This invention provides an energy storage battery based on side current collectors, consisting of... Figure 1 As shown, an energy storage battery based on a side current collector sheet according to the present invention includes a battery pack housing 1 and a battery module 14.

[0044] In some embodiments, including Figure 2 and Figure 3 The image shows a 3-cell battery module and a 2-cell battery module based on a side current collector.

[0045] The battery pack housing 1 is made of plastic and has an integral hollow structure inside. The battery pack housing 1 is connected to the cover 2 by ultrasonic welding. The housing and the cover are ultrasonically welded together.

[0046] The battery modules 14 are separated by partitions, and compressible buffer blocks 8 are provided at both ends of the battery modules;

[0047] The battery module 14 includes a terminal post 3, an end plate, and a plate 10. The plate 10 is placed vertically, and the positive plate is wrapped in a separator bag and fixed by separator welding. Wrapping the positive plate in a separator bag reduces micro-short circuits caused by powder shedding from the plate, and the separator welding method prevents the positive plate from detaching. Leads are connected to both sides of the plate by roll welding, including positive and negative leads. The terminal post 3 is welded to the lead 11. Current collectors are drawn from the side of the plate 10 to alleviate the degradation process of the plate. The side current collectors adopt a fish-scale stacked and threaded coil alternating connection structure to reduce the difference in internal resistance of the plate. The long side of the plate 10 is roll-welded with leads. According to the interconnection method of the battery modules, the leads of each battery module are uniformly tilted in a certain direction, and the leads are stacked in a fish-scale stacked and threaded coil alternating connection.

[0048] 1. The internal resistance measurement value R1 when the front current collector adopts a fish-scale stacked structure and a threaded coil alternating connection structure:

[0049] Energy storage battery placement: Ambient temperature: 25±2℃, place for 1 hour.

[0050] Charging: Ambient temperature: 25±2℃, charging current: 0.5C, charging completion conditions are 20% SOC / 40% SOC / 60% SOC / 80% SOC respectively.

[0051] Energy storage battery placement: Ambient temperature: Ambient temperature required for each test, placed for 3 hours. Resistance measurement: Ambient temperature required for each test, power characteristic estimation mode specified for each temperature, for example: resistance R1 under pulsed conditions with specified power characteristics at 25℃ and 40% SOC.

[0052] 1. The internal resistance measurement value R2 when the side current collector leads adopt a fish scale stacked structure and a threaded coil alternating connection structure;

[0053] Energy storage battery placement: Ambient temperature: 25±2℃, place for 1 hour.

[0054] Charging: Ambient temperature: 25±2℃, charging current: 0.5C, charging completion conditions are 20% SOC / 40% SOC / 60% SOC / 80% SOC respectively.

[0055] Energy storage battery placement: Ambient temperature: Ambient temperature required for each test, placed for 3 hours. Resistance measurement: Ambient temperature required for each test, power characteristic estimation mode specified for each temperature, for example: resistance R2 under specified power characteristic pulse condition at 25℃ and 40% SOC.

[0056] 2. The internal resistance measurement value R3 when the side current collector leads adopt a threaded coil connection method.

[0057] Energy storage battery placement: Ambient temperature: 25±2℃, place for 1 hour.

[0058] Charging: Ambient temperature: 25±2℃, charging current: 0.5C, charging completion conditions are 20% SOC / 40% SOC / 60% SOC / 80% SOC respectively.

[0059] Energy storage battery placement: Ambient temperature: Ambient temperature required for each test, placed for 3 hours. Resistance measurement: Ambient temperature required for each test, power characteristic estimation mode specified for each temperature, for example: resistance R3 under pulsed conditions with specified power characteristics at 25℃ and 40% SOC.

[0060] 3. The internal resistance measurement value R4 when the side current collector leads adopt a fish-scale stacked structure connection method;

[0061] Energy storage battery placement: Ambient temperature: 25±2℃, place for 1 hour.

[0062] Charging: Ambient temperature: 25±2℃, charging current: 0.5C, charging completion conditions are 20% SOC / 40% SOC / 60% SOC / 80% SOC respectively.

[0063] Energy storage battery placement: Ambient temperature: Ambient temperature required for each test, placed for 3 hours; Resistance measurement: Ambient temperature required for each test, power characteristic estimation mode specified for each temperature, for example: resistance R4 under specified power characteristic pulse condition at 25℃ and 40% SOC.

[0064] Comparing the four resistors obtained above, it is clear that the resistor with the second type of side current collector using a fish-scale stacked structure and an alternating threaded coil connection structure significantly reduces the difference in internal resistance. This is mainly because the alternating fish-scale stacked structure and threaded coil connection structure changes the amount of material and structural stability, thereby affecting the current transmission path and reducing the internal resistance.

[0065] In some embodiments, like Figure 7 Schematic diagram of partition Figure 8 Buffer block diagram Figure 9 Schematic diagram of poles Figure 10 End plate diagram Figure 11 Schematic diagram of the battery module finished product.

[0066] Lead plates 11 are connected to both sides of the electrode plate by roll welding. Lead plates 11 include positive lead plates 15 and negative lead plates 16. The terminal post 3 is welded to the lead plates 11. The battery module terminal post is welded to the battery module lead plates. Figure 12 This is a schematic diagram of the electrode plate lead-out plate and electrode post connection. Figure 13 Schematic diagram of lead-out piece welding in the same direction Figure 14 This is a schematic diagram of the lead-out piece using a fish-scale stacked structure and an alternating threaded coil connection structure for butt welding.

[0067] Adjacent battery modules are connected by lead-out pieces 11, and multiple battery modules are welded together to form a single unit.

[0068] In some embodiments, the battery pack housing is fixed by a reinforced metal frame and further reinforced by side reinforcing ribs 7, which are snapped onto both sides of the battery pack housing. Figure 4 It can be seen from the schematic diagram of the reinforced metal frame of the battery pack casing. Figure 5 Schematic diagram of battery pack cover Figure 6 This is a schematic diagram of the side reinforcing ribs of the battery pack casing.

[0069] In some embodiments, the adjacent battery modules are connected by lead-out tabs, including: when the battery modules are located on both sides, the battery modules located on both sides are welded to the adjacent battery modules in the same direction by lead-out tabs, the lead-out tabs are bent in the same direction, and the battery modules are connected by narrow partitions 12.

[0070] When the battery module is in the middle, adjacent battery modules are welded together by lead-out tabs, and the lead-out tabs are bent in opposite directions. Wide partitions 13 are used between modules.

[0071] In some embodiments, the buffer block is attached to the side of the battery module with tape 9 and is adjacent to the terminal post; the electrode plates are stacked with positive and negative electrode plates.

[0072] In some embodiments, the battery pack housing is also provided with an explosion-proof valve 4 and a temperature probe mounting hole 5.

[0073] In some embodiments, the two sides of the electrode plate are respectively connected by roll welding to lead sheets, including: the lead sheets of each battery module are uniformly tilted in the same direction, and the lead sheets are stacked in a fish scale pattern. Figure 15 A schematic diagram of a 5-cell battery module structure. Figure 16 It is a schematic diagram of the positive and negative electrode stacking structure. Figure 17 This is a schematic diagram of the electrode lead-out sheet structure.

[0074] In some embodiments, the interconnection between the electrode plates and the lead-out pieces, the connection between the lead-out pieces of the battery modules, and the connection between the terminal posts and the lead-out pieces are all achieved by one-time laser welding.

[0075] This invention provides an energy storage battery based on a side current collector, which achieves the following beneficial technical effects:

[0076] 1. The positive electrode plate is sealed with a diaphragm bag to reduce micro-short circuits caused by electrode powder shedding; the electrode plate is placed vertically, and to avoid micro-short circuits caused by powder shedding and short circuits caused by misalignment during electrode plate assembly, the positive electrode plate is wrapped with a diaphragm bag and the diaphragm is welded to prevent the positive electrode plate from detaching.

[0077] 2. The current collector is changed from being drawn from the top surface of the electrode to being drawn from the side, which slows down the deterioration process of the electrode.

[0078] 3. The side current collector leads adopt a fish-scale stacked structure to reduce the difference in internal resistance of the plates and reduce connection costs; the leads are roll-welded on the side (long side) of the plates. According to the interconnection method of the battery modules, the leads of each battery module are uniformly tilted in a certain direction, and the leads are stacked in a fish-scale pattern. The interconnection of the plate leads, the connection of the leads between battery modules, and the connection between the terminals and the leads are all done by one-time laser welding.

[0079] 4. The battery pack is designed with an integral cavity. Individual battery modules are separated by partitions. Under the premise that the overall length does not exceed the inner cavity of the battery box, the battery modules can be connected into a battery pack in different arrangements to output different capacities and voltages. The battery modules are separated by partitions. After multiple battery modules are welded together, compressible buffer blocks are set at both ends of the battery modules to reserve a small amount of space for the expansion and deformation of the plates.

[0080] 5. To prevent the box from deforming due to the expansion of the electrode plates after deterioration, reinforcing ribs have been added to the sides of the box, and the exterior of the box is reinforced with a metal frame structure.

[0081] 6. The battery pack of the present invention is simple to pack, has good high-current performance, low internal resistance, and long service life.

[0082] The battery pack has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas and methods of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. An energy storage battery based on a side current collector, characterized in that, Including battery pack housing and battery modules; The battery pack housing is made of plastic, and the inner cavity is an integral hollow structure; the battery pack housing is connected to the housing cover by ultrasonic welding. The battery modules are separated by partitions, and compressible buffer blocks are provided at both ends of the battery modules; The battery module includes terminals, end plates, and plates; the plates are placed vertically, and the positive plate is wrapped with a diaphragm bag to reduce micro-short circuits caused by powder shedding from the plate, and the positive plate is fixed by diaphragm welding to prevent it from detaching. Leads are connected to both sides of the electrode plate by roll welding. The leads include positive and negative leads. The terminal post is welded to the leads. Current collectors are drawn from the side of the electrode plate to alleviate the deterioration process of the electrode plate. The side current collectors adopt a fish-scale stacked and threaded coil alternating connection structure to reduce the difference in internal resistance of the electrode plate. The long side of the electrode plate is roll-welded with leads. According to the interconnection method of the battery modules, the leads of each battery module are uniformly tilted in a certain direction. The leads are stacked in a fish-scale stack and threaded coil alternating connection. Adjacent battery modules are connected by lead-out tabs, and multiple battery modules are welded together to form a single unit.

2. The energy storage battery based on a side current collector as described in claim 1, characterized in that, The battery pack housing is fixed by a reinforced metal frame and further reinforced by side reinforcing ribs that are snapped onto both sides of the battery pack housing.

3. The energy storage battery based on a side current collector as described in claim 1, characterized in that, The adjacent battery modules are connected by lead-out tabs, including: when the battery modules are located on both sides, the battery modules located on both sides are welded to the adjacent battery modules in the same direction by lead-out tabs, the lead-out tabs are bent in the same direction, and narrow partitions are used between the battery modules. When the battery module is in the middle, adjacent battery modules are welded together by lead-out tabs, and the lead-out tabs are bent in opposite directions. Wide partitions are used between modules.

4. The energy storage battery based on a side current collector as described in claim 1, characterized in that, The buffer block is attached to the side of the battery module with tape and is adjacent to the terminal post; the electrode plates are stacked with positive and negative electrode plates.

5. The energy storage battery based on a side current collector as described in claim 1, characterized in that, The battery pack housing is also equipped with an explosion-proof valve and a temperature probe mounting hole.

6. The energy storage battery based on a side current collector as described in claim 1, characterized in that, The connection between the plates and leads, the connection between the leads in the battery modules, and the connection between the terminals and leads are all achieved using one-time laser welding.

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