Power battery and power battery pack

Abstract

The utility model discloses a power battery and a power battery pack, and belongs to the technical field of battery structures, the power battery comprises a shell component, an assembly interval is limited in the shell component, the shell component is provided with an opening end, and the size of the shell component is matched with the size of a selected lead-acid battery; the battery core component is arranged in the assembly interval; and the plate body assembly is arranged at the opening end. By designing the shell component matched with the selected lead-acid battery in size and designing the power battery based on the shell component, the power battery and the lead-acid battery series are completely the same in standard size, so that the power battery can be replaced in parallel and can be conveniently mounted like the lead-acid battery, and the weight of the power battery is one third of that of the lead-acid battery; and the electric quantity of the battery is twice of that of a lead-acid battery, and the service life is more than three times of that of the lead-acid battery.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery structures, and particularly relates to a power battery and a power battery pack. Background Art

[0002] At present, the number of two-wheel vehicles in use is large and still increasing every year. About 90% of the batteries used in existing two-wheel vehicles are lead-acid batteries. With the continuous decline in the prices of raw materials for lithium-ion batteries and the continuous expansion of the manufacturing scale of lithium-ion power batteries, the cost of lithium-ion power batteries has approached that of lead-acid batteries. Compared with lead-acid batteries, in addition to the pollution factors of lead and sulfuric acid, lithium-ion batteries also have prominent advantages such as light weight, small size, and long cycle life. Therefore, it is an irresistible trend for lithium-ion batteries to replace lead-acid batteries. However, the biggest obstacle to the replacement of lead-acid batteries by lithium-ion batteries at present is the lack of size standardization. After more than 140 years of development, lead-acid batteries have formed a series of standard sizes, but there is no corresponding specification design for existing lithium-ion batteries, making it difficult to replace lead-acid batteries with lithium-ion batteries. Content of the Utility Model

[0003] The purpose of the utility model is to provide a power battery to solve the problem of difficult replacement of existing lead-acid batteries mentioned in the above background art.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A power battery, comprising:

[0005] A housing member, within which an assembly area is defined, and which has an open end, and the size of the housing member is adapted to the size of a selected lead-acid battery;

[0006] A plurality of cell members, installed within the assembly area;

[0007] A plate assembly, assembled at the open end of the housing member, and comprising a protection plate configured with a power battery control circuit, and electrode posts are provided on the protection plate.

[0008] By designing a housing member adapted to the size of a selected lead-acid battery and designing a power battery based on the housing member, since the series standard sizes of the power battery and the lead-acid battery are exactly the same, they can be replaced in parallel, and can be installed as conveniently as lead-acid batteries. Its weight is one-third of that of lead-acid batteries, its power is twice that of lead-acid batteries with the same volume, and its service life is more than three times that of lead-acid batteries.

[0009] Further, the plate assembly further comprises:

[0010] A cover member, on which connection pieces in contact with the electrodes of the cell members are integrated;

[0011] An insulating plate body is disposed between the cover plate member and the protection plate body;

[0012] A top cover member, the protection plate body is disposed between the cover plate member and the top cover member, the top cover member is configured to be able to close the open end, and a hole for the electrode pole column to pass through is provided on the top cover member.

[0013] Furthermore, the size of the battery cell member is set based on the housing member.

[0014] By limiting the size of the battery cell member, the battery cell member and the housing member can be better assembled, ensuring the adaptation of the power battery and the lead-acid battery.

[0015] Furthermore, the battery cell member is a cylindrical battery cell, and the diameter of the cylindrical battery cell is 0.3 - 0.5 of the width of the housing member, and the height is 0.7 - 0.95 of the height of the housing member.

[0016] Furthermore, the battery cell member is a soft-pack battery cell, the width of the soft-pack battery cell is 0.7 - 0.95 of the width of the housing member, the thickness is 0.03 - 0.15 of the length of the housing member, and the height is 0.7 - 0.95 of the height of the housing member.

[0017] Furthermore, the battery cell member is a square battery cell, the width of the square battery cell is 0.7 - 0.95 of the width of the housing member, the thickness is 0.06 - 0.12 of the length of the housing member, and the height is 0.7 - 0.95 of the height of the housing member.

[0018] Furthermore, the power battery is a lithium battery, a sodium-ion battery, a lithium iron phosphate manganese battery, a ternary battery, a solid-state battery, or a semi-solid-state battery.

[0019] Furthermore, the battery cell member is installed on the bottom wall of the housing member through a constraint structure, and multiple battery cell members are arranged at intervals.

[0020] Through the constraint structure, on the one hand, the positioning and fixing of the battery cell member can be realized, and on the other hand, the battery cell members can be spaced apart from each other to ensure that the operation of the battery cell members will not affect each other.

[0021] Furthermore, the electrode pole column and the hole on the top cover member are sealed by potting.

[0022] Based on the potting sealing method, the overall sealing effect of the power battery can be improved.

[0023] Furthermore, the specifications of the housing member are adapted to the series of lead-acid batteries.

[0024] Through the multi-specification design of the housing member, the replacement of lead-acid batteries in different usage scenarios can be satisfied, and the applicable range of the power battery can be improved.

[0025] Furthermore, the housing member is made of plastic, metal or non-metallic material.

[0026] The present application also provides a power battery pack, which is formed by connecting a plurality of the above-mentioned power batteries in series, parallel or in series-parallel. Description of the Drawings

[0027] Figure 1 It is a schematic assembly diagram of a 1P4S cylindrical battery module;

[0028] Figure 2 It is a schematic structural diagram of a protection plate body and an insulating plate body;

[0029] Figure 3 It is a schematic structural diagram of a cylindrical battery restraint structure;

[0030] Figure 4 It is a schematic assembly diagram of a 2P4S or 1P8S cylindrical battery module;

[0031] Figure 5 It is a schematic assembly diagram of a 3P4S cylindrical battery module;

[0032] Figure 6 It is a schematic assembly diagram of a 2P4S soft-pack battery module;

[0033] Figure 7 It is a schematic assembly diagram of a 4P4S or 2P8S soft-pack battery module;

[0034] Figure 8 It is a schematic assembly diagram of a 6P4S soft-pack battery module;

[0035] Figure 9 It is a schematic assembly diagram of a 1P4S square battery module;

[0036] Figure 10 It is a schematic assembly diagram of a 2P4S or 1P8S square battery module;

[0037] Figure 11 It is a schematic assembly diagram of a 3P4S square battery module.

[0038] In the figure:

[0039] 100, housing member; 101, assembly section; 102, open end; 103, restraint structure;

[0040] 200, battery cell member;

[0041] 300, protection plate body; 301, electrode terminal;

[0042] 400, insulating plate body;

[0043] 500, cover plate member; 501, connecting piece

[0044] 600, top cover member. Specific embodiments

[0045] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] A power battery, referring to Figure 1 , the main body is composed of a housing member 100, a plate assembly and a plurality of battery cell members 200. The size of the housing member 100 is adapted to the selected lead-acid battery to allow replacement of the lead-acid battery in the same installation environment. Exemplarily, taking a common lead-acid battery as a reference, that is, selecting a commercially available lead-acid battery as a reference. For example, a lead-acid battery with a voltage of 12.8V and a capacity of 20Ah and a size of 77*181*170 is selected as a reference. The above housing member 100 is configured as a cuboid housing with an outer dimension of 77*181*170 mm, and the material of the housing member 100 can be plastic, metal or composite material. Further, an assembly interval 101 for accommodating a plurality of battery cell members 200 is defined in the housing member 100, and it has an open end 102. The above plurality of battery cell members 200 are fixedly installed in the assembly interval 101. Correspondingly, the size and number of the battery cell members 200 are designed based on the size of the housing member 100. Exemplarily, referring to Figure 3, a plurality of constraint structures 103 are integrated on the bottom wall of the above-mentioned housing member 100. A groove for installing the battery cell member 200 is arranged on a single constraint structure 103. A single battery cell member 200 is adhered to the groove in the constraint structure 103 by structural adhesive or the like to realize the assembly of the battery cell member 200 and the housing member 100. At the same time, the plurality of constraint structures 103 are arranged at intervals from each other so that there is enough space between adjacent battery cell members 200. At the same time, a thermal runaway exhaust channel is reserved on the above-mentioned constraint structure 103 to improve the overall installability of the power battery. In some embodiments, the above-mentioned battery cell member 200 can be a cylindrical battery cell, a square battery cell or a soft-pack battery cell. Taking the cylindrical battery cell as an example, the outer shell of the above-mentioned battery cell member 200 can be an aluminum shell or a steel shell and has various connection forms. The battery with charged housing (positively charged, negatively charged) can consider welding on the same side, and the battery without charged needs to be welded on both sides, etc. At the same time, the battery cell member 200 can also be a sodium-ion battery, a lithium iron manganese phosphate battery, a ternary battery, a semi-solid battery or a solid-state battery; further, the above-mentioned battery cell member 200 is designed based on the specifications of the housing member 100, and the battery cell member 200 can be a cylindrical battery cell, a square battery cell or a soft-pack battery cell. Specifically, when the battery cell member 200 is a cylindrical battery cell, the diameter of the cylindrical battery cell is 0.3-0.5 of the width of the housing member 100, and the height is 0.7-0.95 of the height of the housing member 100. For example, the diameter is 37 mm and the height is 146 mm, and the capacity of the cylindrical battery cell is 20 Ah. When the battery cell member 200 is a soft-pack battery cell, the width of the soft-pack battery cell is 0.7-0.95 of the width of the housing member 100, the thickness is 0.03-0.15 of the length of the housing member 100, and the height is 0.7-0.95 of the height of the housing member 100. For example, the size is 9*66*147 mm, and the capacity of the soft-pack battery cell is 10 Ah. When the battery cell member 200 is a square battery cell, the width of the square battery cell is 0.7-0.95 of the width of the housing member 100, the thickness is 0.06-0.12 of the length of the housing member 100, and the height is 0.7-0.95 of the height of the housing member 100. For example, the size is 21*70*146 mm, and the capacity of the square battery cell is 20 Ah.

[0047] Referring to Figure 1, The above-mentioned board assembly includes a cover member 500, a protection board 300, and a top cover member 600. The board assembly is assembled at the open end 12 of the housing member 100. Specifically, the cover member is installed at the open end 102 of the housing member 100 by means of screws or welding connections, etc., and is used to fix and position the battery cell member 200. Further, a connecting piece 501 is integrated on the above-mentioned cover member 500, and the connecting piece contacts the positive and negative electrodes of the battery cell member 200 to realize the series-parallel connection of multiple battery cell members 200. Exemplarily, at this time, 8 cylindrical battery cells are arranged in the housing member 100. If connected in a way of 2 parallel and 4 series, it becomes a product of 12.8V 40Ah (see Figure 4 ); if connected in a way of 8 series, it becomes a product of 25.6V 20Ah (see Figure 4 ). If connected in a way of 3 parallel and 4 series, the product capacity is 60Ah and the voltage is 12.8V (see Figure 5 , the size of the housing member 100 is 77*270*170mm). Based on this, the expansion of the power battery capacity can be realized. In some other examples, taking the arrangement of soft-pack battery cells as an example (based on the above example size and capacity), if connected in a way of 2 parallel and 4 series, a product of 12.8V 20Ah can be formed (see Figure 6 ); or if connected in a way of 4 parallel and 4 series, a product of 12.8V 40Ah can be formed (see Figure 7 ); or if connected in a way of 6 parallel and 4 series, a product of 12.8V 60Ah can be formed (see Figure 8 , the size of the housing member 100 is 77*270*170mm). In some other examples, taking the arrangement of square battery cells as an example, if connected in a way of 1 parallel and 8 series, a product of 25.6V 20Ah can be formed (see Figure 10 ), or if connected in a way of 1 parallel and 4 series (see Figure 9 ) and if connected in a way of 3 parallel and 4 series (see Figure 11 ).

[0048] In some examples, the connecting piece 501 can be of an integral or combined structure. The integral one is integrally formed of the same metal material, and the combined one is combined by welding different metal materials. Both methods can design a Fuse fusing structure at the position where the connecting piece 501 is connected to the battery to ensure the safety of the power battery.

[0049] Refer to Figure 1, the above-mentioned protection board body 300 is configured as a control terminal of the power battery, that is, a control circuit of the power battery is configured thereon. Based on this control circuit, parameters such as voltage and temperature in the power battery can be monitored, and the on-off of the high-voltage circuit of the battery pack and the safety protection of the battery pack can be controlled through the built-in program logic. Exemplarily, the above-mentioned protection board body 300 has control functions such as overcharge protection, over-discharge protection, over-current protection, over-temperature protection, charging current limitation, discharging current limitation, and equalization. At the same time, the protection board body 300 can also automatically jump to charge other cell components 200 after a single cell component 200 is fully charged, and can also stop charging when any cell component 200 reaches the protection voltage.

[0050] Further, referring to Figure 2 , the above-mentioned power battery further includes an insulating board body 400, which is disposed between the protection board body 300 and the cover member 500, and the pole pieces led out from the cover member 500 and the protection board body 300 are welded. In some examples, the protection board body 300 performs signal acquisition and current conduction, without wire harness and other connections, reducing costs. Through welding, unnecessary assembly processes and labor are reduced, and it has good manufacturability. Further, the above-mentioned protection board body 300 also has a Bluetooth communication function. On the one hand, it needs to communicate with the whole vehicle, transmit data, display the remaining power, and can perform remote monitoring to ensure safety; on the other hand, the protection board can communicate with the charger, and does not allow an unqualified charger to charge. Charging can also be stopped when the protection board body 300 has an abnormality.

[0051] At the same time, an electrode terminal 301 is integrated on the above-mentioned protection board body 300. Exemplarily, the electrode terminal 301 can be fixed on the protection board body 300 by means of soldering fixation, etc., and the above-mentioned electrode terminal 301 is configured as a power battery and an external component (such as a load or other power batteries), and the battery packs can be connected in series through a wire harness or a bus bar to form a discharge circuit. Exemplarily, multiple power batteries can be connected in series, parallel, or in a series-parallel combination to form a power battery pack required for electric two-wheel, three-wheel, and four-wheel vehicles. Exemplarily, for example, the most commonly used battery for electric two-wheel vehicles is a 48V 20Ah battery, which requires 4 battery modules of 12.8V 20Ah to be connected in series. For a 64V 40Ah product, 5 battery modules of 12.8V 40Ah need to be connected in series.

[0052] Referring to Figure 1, the above-mentioned top cover member 600 is assembled to the open end 102 of the housing member 100 and configured to be able to close the open end 102 of the housing member 100 to form a closed power battery structure. Exemplarily, the top cover member 600 can be installed on the open end 102 of the housing member 100 by means of ultrasonic welding or bonding, etc., so as to realize the sealed connection between the top cover member 600 and the housing member 100. Further, the above-mentioned top cover member 600 is configured with a hole for the electrode terminal 301 to pass through, and the gap between the terminal and the hole is sealed by means of, for example, potting.

[0053] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A power battery, characterized in that, Comprising: a housing member (100) that defines an assembly area (101) therein, has an open end (102), and the size of the housing member (100) is adapted to the selected lead-acid battery size; a plurality of cell members (200), installed in the assembly area (101); a plate assembly, assembled at the open end (102) of the housing member (100), and includes a protection plate body (300) configured with a power battery control circuit, and electrode posts (301) are provided on the protection plate body (300).

2. The power battery according to claim 1, characterized in that: The plate assembly further includes: a cover plate member (500) on which connection pieces (501) in contact with the electrodes of the cell members (200) are integrated; an insulating plate body (400), disposed between the cover plate member (500) and the protection plate body (300); a top cover member (600), the protection plate body (300) is disposed between the cover plate member (500) and the top cover member (600), the top cover member is configured to be able to close the open end (102), and a hole for the electrode post (301) to pass through is provided on the top cover member (600).

3. A power battery according to claim 1 or 2, characterized in that: The size of the cell member (200) is set according to the housing member (100).

4. A power battery according to claim 3, characterized in that: The cell member (200) is a cylindrical cell, the diameter of the cylindrical cell is 0.3 - 0.5 of the width of the housing member (100), and the height is 0.7 - 0.95 of the height of the housing member (100).

5. A power battery according to claim 3, characterized in that: The cell member (200) is a soft-pack cell, the width of the soft-pack cell is 0.7 - 0.95 of the width of the housing member (100), the thickness is 0.04 - 0.15 of the length of the housing member (100), and the height is 0.7 - 0.95 of the height of the housing member (100).

6. The power battery according to claim 3, wherein: The cell member (200) is a square cell, the width of the square cell is 0.7 - 0.95 of the width of the housing member (100), the thickness is 0.06 - 0.15 of the length of the housing member (100), and the height is 0.7 - 0.95 of the height of the housing member (100).

7. The power battery according to claim 4, characterized in that: The power battery is a lithium battery, a sodium-ion battery, a lithium iron phosphate manganese battery, a ternary battery, a solid-state battery or a semi-solid-state battery.

8. A power battery according to claim 1, characterized in that: The cell member (200) is installed on the bottom wall of the housing member (100) through a restraint structure (103), and a plurality of cell members (200) are spaced apart from each other.

9. A power battery according to claim 1, characterized in that: The electrode post (301) and the hole on the top cover member (600) are sealed by potting.

10. A power battery according to claim 1, characterized in that: The specification of the housing member (100) is adapted to the series lead-acid battery.

11. A power battery according to claim 1, characterized in that: The material of the housing member (100) is plastic, metal or non-metallic material.

12. A power battery pack, characterized in that: Formed by series connection, parallel connection or series-parallel connection of several power batteries according to any one of claims 1 - 9.

Images