Power battery pack

Abstract

The utility model discloses a power battery pack, which belongs to the technical field of power batteries and comprises a shell structure and a plurality of battery core components assembled in the shell structure, the height of the shell structure is matched with that of a standard lead-acid battery, and the width of the shell structure is matched with the length of the standard lead-acid battery. And the length of the shell structure is times of the width of a standard lead-acid battery, wherein the length is a positive integer greater than or equal to 2. The size of the power battery pack is limited on the basis of the size of the standard lead-acid battery, that is, the replaceable integral battery pack is designed according to the size of the selected lead-acid battery, and a shell, a protection component and an acquisition wire harness are not separately arranged, so that the production cost is reduced, and the production efficiency is improved. And the problem of unstable connection caused by the fact that the split type battery packs need to be connected in series through a high-voltage wire harness is also avoided.

Description

Technical Field

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

[0002] With the continuous advancement of new energy technologies, the application scope of lithium-ion batteries continues to expand, and they have also become popular in small power equipment such as electric two-wheelers and three-wheelers. Currently, most small power equipment in the market still uses lead-acid batteries, but these batteries have shortcomings such as low energy density, short service life, and poor environmental performance, and are gradually being abandoned by the market.

[0003] Using lithium-ion batteries to replace lead-acid batteries can effectively solve the above problems. Especially for batteries that require large capacity and high voltage platforms, existing battery packs mostly adopt a split structure, that is, multiple standard batteries are connected to form a battery with large capacity and high voltage platform. For example, patent CN221978113U provides such a battery. However, this split design concept will lead to wasted space due to the need for multiple battery casings, and will also increase costs. In addition, each split part of the split battery pack must be equipped with protection components and acquisition circuits, which undoubtedly increases the overall cost. Utility Model Content

[0004] The purpose of the present utility model is to provide a power battery pack to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: a power battery pack, comprising:

[0006] The shell structure is adapted to the height of the standard lead-acid battery, the width is adapted to the length of the standard lead-acid battery, and the length of the shell structure is 1 / 4 of the width of the standard lead-acid battery. times, of which is a positive integer greater than or equal to 2;

[0007] A plurality of electric core components are assembled in the shell structure, and the ratio of the cross-sectional area of ​​the plurality of electric core components to the cross-sectional area of ​​the interior space of the shell structure is not less than 0.65.

[0008] This application limits the size of the power battery pack based on the standard lead-acid battery size, that is, a replaceable integral battery pack is designed according to the size of the selected lead-acid battery, and is not equipped with a separate shell, protective components and collection harness. This not only reduces production costs, but also avoids the problem of unstable connection caused by the need to connect the split battery packs in series through high-voltage harnesses. At the same time, by limiting the size of the battery cell components, the effective utilization of the internal area of ​​the shell structure is guaranteed while ensuring the overall strength of the power battery.

[0009] Furthermore, the battery cell component is a cylindrical battery cell, and the radius of the cylindrical battery cell is satisfy ,in is the cross-sectional area of ​​the internal space of the shell structure, is the number of battery cell components.

[0010] Furthermore, the battery cell component is a square battery cell or a soft-pack battery cell, and the width of the square battery cell or the soft-pack battery cell is satisfy ,in is the shell structure width, is the shell structure wall thickness.

[0011] Furthermore, the thickness of the square battery cell or soft pack battery cell satisfy ,in is the shell structure length, is the number of battery cell components, is the shell structure wall thickness.

[0012] Furthermore, the ratio of the height of the battery cell component to the height of the shell structure is between 0.7 and 0.95.

[0013] Furthermore, N is 2 or 3.

[0014] Furthermore, the ratio of the capacity of the power battery pack to the capacity of a standard lead-acid battery is greater than or equal to 1.5.

[0015] Furthermore, the number of the battery core components is not less than 4.

[0016] Furthermore, the housing structure includes:

[0017] a housing member, the bottom surface of which serves as a mounting surface for the battery cell member; and

[0018] A cover assembly is assembled on the open end of the shell member and includes:

[0019] An integrated cover plate, connected to the housing member and provided with a plurality of connecting pieces connected to the battery core members;

[0020] A protection plate body is mounted on the integrated cover plate and is provided with a connecting electrode connected to the connecting piece, and a pole is provided on the outer end surface of the protection plate body;

[0021] An upper cover component is provided with a groove at the pole position.

[0022] Furthermore, the ratio of the height of the cover assembly to the height of the shell structure is 0.05 to 0.12.

[0023] Furthermore, the bottom surface of the shell component is provided with a limiting hole structure for limiting the installation of the battery core component, and the number of the limiting hole structures is not less than the number of the battery core components.

[0024] Furthermore, the power battery pack further includes a heating plate disposed between the protection plate and the upper cover member, and a control port for the heating plate is provided on the protection plate.

[0025] Furthermore, the power battery is a lithium iron phosphate battery, a lithium manganese oxide battery, a ternary battery or a sodium ion battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the conversion between split battery pack and integrated battery pack;

[0027] Figure 2 This is a schematic diagram of the layout of the cell components of the power battery pack of this application;

[0028] Figure 3 This is the exploded diagram of the power battery pack;

[0029] Figure 4 Schematic diagram of the battery pack;

[0030] Figure 5 This is a schematic diagram for calculating the safety utilization factor;

[0031] Figure 6 A top view of the interior of the shell member;

[0032] Figure 7 Schematic diagram of the integrated cover and protection plate;

[0033] Figure 8 Schematic diagram of the upper cover component Figure 1 ;

[0034] Figure 9 Schematic diagram of the upper cover component Figure 2 ;

[0035] Figure 10 Schematic diagram of the battery pack structure in which the battery cell component is a soft-pack battery cell;

[0036] Figure 11 A schematic diagram of the battery pack structure in which the battery cell components are square batteries;

[0037] Figure 12 This is a schematic diagram of the dimensions of a square or soft-pack battery cell.

[0038] In the picture:

[0039] 1-1, upper cover member; 1-2, integrated cover plate; 1-3, battery pack; 1-4, housing member; 1-5, protective plate; 1-6, heating plate; 1-7, sealing foam;

[0040] 2-1. Battery core components;

[0041] 4-1, exhaust area; 4-2, reinforced fixing structure; 4-2-1, first mounting hole; 4-3, notch; 4-4, ventilation area; 4-5, limiting hole structure;

[0042] 5-1, second mounting hole; 5-2, connecting ear; 5-3, connecting piece; 5-4, positioning column; 5-5 fixing column; 5-6, wiring harness buckle; 5-7, fixing hole; 5-8, connecting pole piece; 5-9, pole;

[0043] 6-1, glue groove; 6-2, reinforcement rib;

[0044] 7-1. Pulling groove 7-1; 7-2. Identification feature; 7-3. Groove. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] A power battery pack includes a housing structure, the size of which is compatible with the size of the selected lead-acid battery. Figure 1 The size of the shell structure in the power battery pack of the present application is adapted to the size of multiple standard lead-acid batteries to be spliced ​​together, so as to transform the original split design into an integrated design. Exemplarily, the power battery is a lithium iron phosphate battery, a ternary battery, a lithium manganese oxide battery, a sodium ion battery, a fuel cell or a lithium sulfur battery. In other examples, the power battery is a solid-state or semi-solid-state battery. In some embodiments, the height of the shell structure is adapted to (i.e., equal to) the height of the standard lead-acid battery, the width is adapted to the length of the standard lead-acid battery, and the length of the shell structure is 1 / 4 of the width of the standard lead-acid battery. times, of which is a positive integer greater than or equal to 2. In some examples, the standard lead-acid battery size (length 181mm, width 77mm, height 170mm) as an example, at this time, three standard lead-acid batteries are spliced ​​along the width direction, and the size after splicing is (length 231mm, width 181mm, height 170mm), the size of the shell structure can perfectly match the application scenarios of most lead-acid batteries. For example, taking the arrangement of 20Ah cylindrical cells in the shell component as an example, up to 24 cells can be arranged to form a 76.8V20Ah battery; at the same time, the number of cells can be reduced to form battery packs 1-3 such as 73.6V20Ah and 64V20Ah. The splicing size of two standard lead-acid batteries is (length 154mm, width 181mm, height 170mm), a maximum of 16 cells can be arranged to form a 51.2V20Ah battery pack 1-3, and 1 cell can be reduced to form a 48V20Ah battery pack 1-3 (refer to Figure 2 ), which is compatible with most lead-acid batteries on the market. In other examples, the size of a 12V 32Ah standard lead-acid battery is (length 267mm, width 77mm, height 170mm), based on the splicing scheme design in this application, it can be composed of 38.4V60Ah (size is , i.e. length 231mm, width 267mm, height 170mm) and 25.6V 60Ah (size is , that is, a battery with a length of 154mm, a width of 267mm, and a height of 170mm).

[0047] Reference Figure 3 , and combined with Figure 4 The above-mentioned shell structure includes a shell member 1-4 and a cover assembly assembled at the open end (upper end) of the shell member 1-4, wherein the shell member 1-4 defines an accommodating area for accommodating the battery pack 1-3. In some examples, the battery pack 1-3 is composed of a plurality of battery cells arranged along the length direction of the shell member 1-4, and a single battery cell is composed of a plurality of battery core members 2-1 arranged at intervals along the width direction of the shell member 1-4, and the number of battery core members 2-1 is not less than 4. At this time, in the size design of the power battery shell structure, if the length, width and height dimensions of the lead-acid battery to be replaced are known to be b, a and c respectively, and the wall thickness d of the internal battery pack 1-3 is generally 1 to 3 mm, then the cross-sectional area of ​​the internal space for placing the battery pack 1-3 is Assuming that the total voltage of the selected lead-acid battery is V1 and the capacity is H1, the nominal voltage of the cell component 2-1 in the battery pack 1-3 is V2 and the capacity is H2, then the series number e=V1 / V2, the parallel number f=H1 / H2, and correspondingly, the number of cell components 2-1 included in the battery pack 1-3 .

[0048] In some embodiments, the ratio of the cross-sectional area of ​​the plurality of battery cell components (2-1) constituting the battery pack 1-3 to the cross-sectional area of ​​the internal space of the shell structure is not less than 0.65, so as to fully utilize the internal space of the shell component. In some examples, the battery cell component (2-1) is a cylindrical battery cell, in which case the radius of the cylindrical battery cell is satisfy ,in is the cross-sectional area of ​​the internal space of the shell structure, is the number of battery cell components. In other examples, the battery cell components (2-1) are square battery cells (such as Figure 11 as shown) or soft pack batteries (as shown Figure 10 The width and length directions of square cells or soft-pack cells are shown as follows. Figure 12 As shown, the width satisfy ,in is the shell structure width, The thickness of the shell structure, the thickness of the square battery cell or the soft pack battery cell satisfy ,in is the shell structure length, is the number of battery cell components, is the shell structure wall thickness.

[0049] At the same time, the battery pack of electric two-wheeled vehicles belongs to the field of small power batteries, which require a safe utilization factor of the cross-sectional area. The value is within the range of 0.7 to 0.99. The specific calculation method of the cross-sectional area safety utilization coefficient is: ,in It is the sum of the cross-sectional area of ​​the cell component 2-1 and the area of ​​the safety extension surface. It should be noted that the cross-sectional area of ​​the cell component 2-1 specifically refers to the cross-sectional area of ​​the cell component 2-1 in the horizontal direction, that is, the cross-sectional area in the direction parallel to the upper cover of the battery pack; the safety extension surface area refers to the area of ​​the interface that wraps the cell component 2-1 and extends outward. In addition, the design requires that the ratio of the safety extension surface area to the cross-sectional area of ​​the cell component 2-1 be less than or equal to 0.05. For example, Figure 5 Taking the cylindrical battery as an example, the cell component 2-1 in the figure is represented as a cylindrical cell component 2-1. Figure 5 It is represented by the cross-sectional area of ​​the shell structure and the cylindrical battery in the horizontal direction; the safe extension area of ​​the battery cell component 2-1 refers to the cross section of the cylindrical battery cell component 2-1 extending along the diameter direction to the dotted circle in the figure. The circular cross section formed by the combination of the dotted circle and the solid circle is called the safe extension area of ​​the battery cell component 2-1. In summary, the above mentioned ,in It is represented by the radius of the cell component 2-1, (hereinafter referred to as the safety distance) is expressed as the difference between the dotted circle and the solid circle, and the value range is generally 0.1 to 10 mm. In this case, The value range is 0.5~6mm;

[0050] At the same time, the shell structure height in this application is , the overall height of the cover assembly is , then the height of the cylindrical battery is The design requires that the ratio of the height of the cylindrical battery and the height of the cylindrical battery placement be between 0.7 and 0.95, that is, the ratio of the height of the battery cell component and the height of the shell structure is 0.7 to 0.95, preferably 0.75 to 0.9.

[0051] Continue to refer to Figure 6 The bottom surface of the shell member 1-4 is provided with a limiting hole structure 4-5 for mounting and limiting the battery cell member 2-1, and the number of the limiting hole structures 4-5 is not less than the number of the battery cell members 2-1 included in the battery pack 1-3, so that the arrangement of the battery cell members 2-1 can be reduced as needed. For example, when a maximum of 24 battery cells can be arranged and a 76.8V20Ah battery is formed, the number of battery cells can be reduced to form a battery pack 1-3 of 73.6V20Ah, 64V20Ah, etc. At the same time, the limiting hole structure 4- The bottom wall of 5 and the bottom surface of the battery cell component 2-1 are arranged to form a breathable area 4-4, and for a single battery cell, a gap 4-3 is formed between the limiting hole structures 4-5 of adjacent battery cell components 2-1, and the limiting hole structure 4-5 located at one end of the battery cell extends outward to form an exhaust area 4-1. When the battery cell component 2-1 produces gas, the generated gas will be collected in the exhaust area 4-1 through the breathable area 4-4 and the gap 4-3 and discharged, thereby greatly reducing the safety risk of the power battery caused by gas production.

[0052] Continue to refer to Figure 6 The bottom wall of the shell member 1-4 is also provided with a reinforcing fixing structure 4-2 extending along the height direction of the shell member 1-4. The position of the reinforcing fixing structure 4-2 and the position of the limiting hole structure 4-5 are staggered with each other. For example, the reinforcing fixing structure 4-2 is arranged adjacent to the side wall of the shell member 1-4, and the reinforcing fixing structure 4-2 is provided with a first mounting hole 4-2-1 extending along the height direction of the shell member 1-4, which strengthens the shell member 1-4 while simplifying the subsequent installation and fixation of the integrated cover plate 1-2.

[0053] Reference Figure 1 , and combined with Figure 7The above-mentioned cover assembly includes an integrated cover 1-2, a protective plate body 1-5 and an upper cover member 1-1, wherein the integrated cover 1-2 is connected to the shell member 1-4 by fasteners such as bolts. Specifically, the above-mentioned integrated cover 1-2 has a bracket, which is provided with a triangular connecting ear 5-2 at a corresponding position of the reinforcing fixing structure 4-2 on the shell member 1-4, and the connecting ear 5-2 is provided with a second mounting hole 5-1 corresponding to the first mounting hole 4-2-1 on the reinforcing fixing structure 4-2. Based on the coordinated action of fasteners such as bolts and the first mounting hole 4-2-1 and the second mounting hole 5-1, By using it, the connection between the integrated cover plate 1-2 and the shell component 1-4 can be realized. Continuing with reference to FIG. 7, the above-mentioned integrated cover plate 1-2 is provided with a plurality of connecting pieces 5-3. For example, the integrated cover plate 1-2 is provided with positioning columns 5-4 that match the holes on the connecting pieces 5-3. At this time, the connecting pieces 5-3 are fixed to the integrated cover plate 1-2 by means of hot riveting or the like, and are welded to the battery cell components 2-1. Based on the connecting pieces 5-3, the series and parallel connection between the battery cell components 2-1 is realized. At the same time, the above-mentioned integrated cover plate 1-2 is also provided with a wiring harness buckle 5-6 for fixing the collection wiring harness led out from the battery pack 1-3.

[0054] The above-mentioned protection board 1-5 constitutes the control terminal of the power battery, that is, it is equipped with a control circuit of the power battery. Based on the control circuit, it can realize the monitoring of parameters such as voltage and temperature in the power battery, and control the on and off of the high-voltage circuit of the battery pack 1-3 and the safety protection of the battery pack 1-3 through the built-in program logic. For example, the above-mentioned protection board 1-5 has control functions such as overcharge protection, over-discharge protection, overcurrent protection, overtemperature protection, charging current limitation, discharge current limitation, and balancing. In some examples, the above-mentioned protection board 1-5 is equipped with a Bluetooth module, which can be connected to the mobile phone to monitor the relevant real-time data of the battery pack online. In some embodiments, refer to Figure 1 , and combined with Figure 7The protection plate body 1-5 is arranged between the integrated cover plate 1-2 and the upper cover member 1-1 and is installed on the integrated cover plate 1-2. In some embodiments, a fixing column 5-5 with a threaded hole structure is provided on the upper surface of the above-mentioned integrated cover plate 1-2. Correspondingly, a fixing hole 5-7 for the fixing column 5-5 to pass through is provided on the above-mentioned protection plate body 1-5. The fixing column 5-5 and the fixing hole 5-7 cooperate to realize the connection between the integrated cover plate 1-2 and the protection plate body 1-5. At the same time, a connecting electrode 5-8 is provided on the protection plate body 1-5. The connecting electrode 5-8 is connected to the connecting piece 5-3 on the integrated cover plate 1-2 at high pressure by bolts. Continuing to refer to Figure 7, a pole 5-9 is integrated on the outer end surface of the above-mentioned protection plate body 1-5. For example, the pole 5-9 can be fixed to the protection plate body 1-5 by soldering or other means, and the pole 5-9 constitutes a connector between the power battery and external components. The battery packs 1-3 can be connected in series by a wiring harness or a bus to form a discharge circuit.

[0055] The upper cover member 1-1 is made of materials such as metal or plastic. Figure 8 The inner end surface of the upper cover member 1-1 (i.e., the end surface facing the integrated cover plate 1-2) is provided with a reinforcing rib 6-2 structure, and correspondingly, the outer end surface of the upper cover member 1-1 is provided with a pulling groove 7-1 for accommodating a pulling structure such as a handle or nylon belt, Figure 9 The upper cover member 1-1 is provided with a groove 7-3 at the corresponding position of the pole 5-9, and a sealing foam 1-7 is arranged at the position of the groove 7-3 to seal the pole 5-9. In some embodiments, the upper cover is coated with sealants of different colors (for example, red and blue) at different positions of the pole 5-9 for the positive and negative identification features 7-2. Figure 8 In some examples, the upper cover member 1-1 is provided with a sealant groove 6-1 at the connection position with the shell member 1-4, so as to achieve a sealed connection between the upper cover member 1-1 and the shell member 1-4. In other examples, the upper cover member 1-1 is sealed and connected to the shell member 1-4 by ultrasonic or hot melt methods.

[0056] In some embodiments, the power battery further includes a heating sheet 1-6 disposed between the upper cover member 1-1 and the protective plate 1-5, and the heating sheet 1-6 is connected to the integrated cover 1-2 by bolts. At the same time, a heating control interface is reserved on the protective plate 1-5. When the power battery is used in a low temperature environment, the heating plate can be used to heat the battery cell member 2-1 in the power battery to improve the charging and discharging efficiency of the battery cell.

[0057] Although the 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 variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A power battery pack, characterized in that: include: The shell structure is adapted to the height of a standard lead-acid battery, the width is adapted to the length of a standard lead-acid battery, and the length of the shell structure is 1 / 4 of the width of a standard lead-acid battery. times, of which is a positive integer greater than or equal to 2; A plurality of electric core components (2-1) are assembled in the shell structure, and the ratio of the cross-sectional area of ​​the plurality of electric core components (2-1) to the cross-sectional area of ​​the interior space of the shell structure is not less than 0.

65.

2. A power battery pack according to claim 1, characterized in that: The battery core component (2-1) is a cylindrical battery core, and the radius of the cylindrical battery core is satisfy ,in is the cross-sectional area of ​​the internal space of the shell structure, is the number of battery cell components.

3. The power battery pack according to claim 1, characterized in that: The battery cell component (2-1) is a square battery cell or a soft-pack battery cell, and the width of the square battery cell or the soft-pack battery cell is satisfy ,in is the shell structure width, is the shell structure wall thickness.

4. A power battery pack according to claim 3, characterized in that: Thickness of square cells or soft-pack cells satisfy ,in is the shell structure length, is the number of battery cell components, is the shell structure wall thickness.

5. The power battery pack according to claim 1, characterized in that: The ratio of the height of the battery core component to the height of the shell structure is between 0.7 and 0.

95.

6. The power battery pack according to claim 1, characterized in that: N is 2 or 3.

7. The power battery pack according to claim 1, characterized in that: The ratio of the capacity of the power battery pack to the capacity of a standard lead-acid battery is greater than or equal to 1.

5.

8. The power battery pack according to claim 1, characterized in that: The number of the battery core components (2-1) is not less than 4.

9. The power battery pack according to claim 1, characterized in that: The housing structure comprises: A shell component (1-4), wherein the bottom surface of the shell component (1-4) serves as an assembly surface for the battery core component (2-1); and A cover assembly is assembled on the open end of the shell member (1-4) and comprises: An integrated cover plate (1-2) is connected to the housing component (1-4) and is provided with a plurality of connecting pieces (5-3) connected to the battery core component (2-1); A protection plate body (1-5) is mounted on the integrated cover plate (1-2) and is provided with a connection pole piece (5-8) connected to the connection piece (5-3), and a pole (5-9) is provided on the outer end surface of the protection plate body (1-5); An upper cover component (1-1), wherein the upper cover component (1-1) is provided with a groove (7-3) at the position of the pole (5-9).

10. The power battery pack according to claim 9, characterized in that: The ratio of the height of the cover assembly to the height of the shell structure is 0.05 to 0.

12.

11. The power battery pack according to claim 9, characterized in that: The bottom surface of the shell component (1-4) is provided with a limiting hole structure (4-5) for limiting the installation of the battery core component (2-1), and the number of the limiting hole structures (4-5) is not less than the number of the battery core components (2-1).

12. The power battery pack according to claim 9, characterized in that: The power battery pack further comprises a heating plate (1-6) arranged between the protection plate (1-5) and the upper cover component (1-1), and a control port for the heating plate (1-6) is provided on the protection plate (1-5).

13. The power battery pack according to claim 1, characterized in that: The power battery is a lithium iron phosphate battery, a lithium manganese oxide battery, a ternary battery or a sodium ion battery.

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