Battery assembly and battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to a battery assembly and a battery pack. The battery assembly comprises a connecting circuit, a first single battery and a second single battery; the first single battery is provided with a safety device, and the second single battery is not provided with a safety device; and the first single battery and the second single battery are electrically connected with the connecting circuit. The battery pack comprises the battery assembly. According to the battery assembly and the battery pack, under accidental working conditions, the second single battery, the box body and the like can conduct the safety device of the first single battery through the connecting circuit, so that the voltage between the high-voltage loop and the box body is reduced through the safety device of the first single battery, and the risk of arc discharge of the box body and the like is reduced; according to the battery assembly and the battery pack, the accidents that the box body is burnt through and even is on fire due to arc discharge are avoided, so that the use safety of the battery assembly and the battery pack is improved, and the cost can be obviously optimized by using the second single batteries in a mixed manner.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery assembly and a battery pack. Background Art

[0002] At present, the same type of battery is usually built into the power battery pack, for example, the batteries used in the power battery pack are all single cells of the ternary system. Among them, the single cells of the ternary system generally have a fuse, and the fuse is configured in the power distribution box of the power battery pack.

[0003] Since the single cell battery itself has a fuse function and the distribution box also has a fuse function, this type of power battery pack has redundant fuse functions and is relatively costly. Utility Model Content

[0004] The purpose of the present application is to provide a battery assembly and a battery pack, so as to solve to a certain extent the technical problem existing in the prior art that both the single battery and the distribution box are configured with a fuse function, resulting in redundant fuse functions of the power battery and high costs.

[0005] The present application provides a battery assembly, including a connection circuit, a first single battery and a second single battery;

[0006] The first single cell has a safety device, and the second single cell does not have a safety device;

[0007] The first single battery and the second single battery are both electrically connected to the connection circuit.

[0008] In the above technical solution, further, the first single battery and the second single battery are arranged in a row along a predetermined direction;

[0009] At least one second unit battery is disposed on one side of the first unit battery along the predetermined direction.

[0010] In any of the above technical solutions, further, along the predetermined direction, a plurality of the second single cells are arranged on one side of the first single cell.

[0011] In any of the above technical solutions, further, the number of the first single battery cells is multiple.

[0012] In any of the above technical solutions, further, the number of the first single cells is not greater than the number of the second single cells.

[0013] In any of the above technical solutions, further, the shell of the first single battery and the shell of the second single battery are configured differently.

[0014] In any of the above technical solutions, further, the safety device is a fuse-type safety device.

[0015] The present application also provides a battery pack, comprising a box and a battery assembly as described in any of the above technical solutions;

[0016] The battery assembly is arranged in the box.

[0017] In any of the above technical solutions, further, the battery assembly is provided in plurality, and the plurality of battery assemblies are provided in the box.

[0018] In any of the above technical solutions, further, the first single cells and the second single cells in the plurality of battery assemblies are arranged in the same or different rules.

[0019] Compared with the prior art, the beneficial effects of this application are:

[0020] The battery assembly provided by the present application is a battery assembly in which a first single cell with a safety device and a second single cell without a safety device are mixed and used. When the battery assembly is applied to a battery pack, if the battery pack is deformed by external collision, extrusion, etc., then the connecting circuit, the first single cell or the second single cell are at risk of short-circuiting with the box, etc. Under such an unexpected working condition, the second single cell and the box, etc. can both conduct the safety device of the first single cell through the connecting circuit, thereby reducing the voltage between the high-voltage circuit and the box through the safety device of the first single cell, reducing the risk of arcing in the box, etc., and preventing the accident of burning through the box or even catching fire due to arcing, thereby improving the safety of the battery assembly and the battery pack described therein, and by mixing the second single cell, the cost can be significantly optimized.

[0021] The battery pack provided in the present application includes the above-mentioned battery assembly, thereby being able to achieve all the beneficial effects of the battery assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the structure of a battery assembly provided in Example 1 of the present application;

[0024] Figure 2 A schematic diagram of the structure of the battery pack provided in Example 2 of the present application.

[0025] Reference numerals:

[0026] 1-battery assembly; 10-first single cell; 11-second single cell; 2-battery pack; 20-box. DETAILED DESCRIPTION

[0027] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Embodiment 1

[0031] See also Figure 1 Combined with Figure 2 As shown, an embodiment of the present application provides a battery assembly 1 including a connection circuit, a first single battery 10 and a second single battery 11 .

[0032] The first single cell 10 has a safety device, and the second single cell 11 does not have a safety device, wherein the first single cell 10 may be, for example, a single cell of a ternary system, and the second single cell 11 may be, for example, a single cell of a lithium iron phosphate system. Since single cells of a ternary system have higher requirements for the safety function, the first single cell 10 is configured to have a safety device, and the second single cell 11 is configured to have no safety device. Of course, the first single cell 10 may also be configured as a single cell of a lithium iron phosphate system with a safety device, and correspondingly, the second single cell 11 may be configured as a single cell of a lithium iron phosphate system without a safety device.

[0033] The safety device may be a fusible safety device, such as a fusible fuse.

[0034] The first single battery 10 and the second single battery 11 are both electrically connected to the connection circuit, that is, the first single battery 10 with the safety device and the second single battery 11 without the safety device are mixed and used in the battery assembly 1, so that the battery assembly 1 is not limited to the same type of built-in batteries. In addition, the first single battery 10 and the second single battery 11 are connected in series and parallel through the connection circuit to form a high-voltage circuit.

[0035] It is worth explaining that, except that the first single cell 10 and the second single cell 11 are configured with safety devices differently, the series-parallel connection form of the first single cell 10 and the second single cell 11 in the battery assembly 1 is the same as the existing configuration.

[0036] Then when the battery assembly 1 is applied to the battery pack 2, the battery pack 2 also includes a box 20 for accommodating the battery assembly 1. If the battery pack 2 is deformed by external collision, extrusion, etc., the connecting circuit, the first single battery 10 or the second single battery 11 are at risk of short-circuiting with the box 20, etc. In such an unexpected working condition, the second single battery 11 and the box 20, etc. can conduct the safety device of the first single battery 10 through the connecting circuit, so that the voltage between the high-voltage circuit and the box 20 is reduced through the safety device of the first single battery 10, and the risk of arcing of the box 20, etc. is reduced, and the accident of burning through or even catching fire of the box 20 due to arcing is prevented, thereby improving the safety of the battery assembly 1 and its battery pack 2, and by mixing the second single battery 11, the cost can be significantly optimized.

[0037] At the same time, compared with using all second single cells 11 without safety devices and relying only on the distribution box of the battery pack 2 to achieve fuse protection, the battery assembly 1 can further reduce the risk of arcing.

[0038] In an optional solution of this embodiment, the first single battery 10 and the second single battery 11 are arranged in a row along a predetermined direction; along the predetermined direction, at least one second single battery 11 is disposed on one side of the first single battery 10 .

[0039] That is, a first single cell 10 is arranged every at least one second single cell 11, so that for each first single cell 10, at least one second single cell 11 on one side thereof is grouped, and the first single cell 10 in the group provides a safety function for the second single cell 11 in the group, so that each first single cell 10 can provide a safety function for at least one second single cell 11 in addition to realizing its own safety function, thereby further optimizing the cost. In addition, when there are multiple first single cells 10, according to different short-circuit ranges, multiple first single cells 10 in the short-circuit range may jointly provide a fuse protection function to reduce the voltage of the high-voltage circuit.

[0040] It can be understood that the first single cells 10 and the second single cells 11 in the battery assembly 1 can be arranged in a row along a predetermined direction (not shown in the figure).

[0041] Alternatively, the first single battery 10 and the second single battery 11 in the battery assembly 1 may also be arranged in multiple rows along a predetermined direction, such as Figure 1 and Figure 2 As shown, the first single battery 10 and the second single battery 11 in the battery assembly 1 are arranged in two columns along a predetermined direction. When the first single battery 10 and the second single battery 11 in the battery assembly 1 are arranged in multiple columns along a predetermined direction, the first single battery 10 and the second single battery 11 in each column can be configured to be arranged in the same rule or different rules according to actual needs.

[0042] In this embodiment, as an implementation method in which the first single battery 10 and the second single battery 11 are arranged in a row along a predetermined direction, as shown in FIG. Figure 2 As shown, a second single battery 11 is arranged on the right side of the first single battery 10 counted from the left in a predetermined direction.

[0043] In this embodiment, as another possible implementation method in which the first single battery 10 and the second single battery 11 are arranged in a row along a predetermined direction, a plurality of second single batteries 11 are arranged on one side of the first single battery 10 along the predetermined direction. Figure 2 As shown, four second unit batteries 11 are arranged on the right side of the second first unit battery 10 from the left in a predetermined direction.

[0044] In the present embodiment, there are multiple first single cells 10, so that when the battery assembly 1 causes a short circuit in the battery pack 2 due to intrusion, multiple second single cells 11 can cut the single cells in the high-voltage circuit of the battery assembly 1 (generally referring to the first single cells and the second single cells 11) into several groups, so that the voltage of the high-voltage circuit is reduced to the lowest state, further reducing the risk of arcing in the box 20 and the like, and improving the safety of the battery assembly 1.

[0045] In the optional solution of this embodiment, the number of the first single cells 10 is not greater than the number of the second single cells 11, that is, the number of the first single cells 10 with safety devices is less than or equal to the number of the second single cells 11 without safety devices. Therefore, while ensuring the electrical performance requirements of the battery assembly 1, the number of the second single cells 11 is configured to be as large as possible, increasing the proportion of batteries without safety devices, which is conducive to further optimizing costs.

[0046] If the cost of the battery assembly 1 allows, the number of the first single cells 10 may be configured to be greater than the number of the second single cells 11 , thereby further reducing the arcing risk of the battery assembly 1 .

[0047] In an optional solution of this embodiment, the shell of the first single cell 10 and the shell of the second single cell 11 are configured differently, so that the first single cell 10 and the second single cell 11 can be intuitively distinguished from each other from their appearance, thereby improving the assembly convenience of the battery assembly 1.

[0048] Optionally, at least one of the housing of the first single battery 10 and the housing of the second single battery 11 may be provided with a distinguishing mark for distinguishing the two.

[0049] Embodiment 2

[0050] Embodiment 2 provides a battery pack, which includes the battery assembly in Embodiment 1. The technical features of the battery assembly disclosed in Embodiment 1 are also applicable to this embodiment, and the technical features of the battery assembly disclosed in Embodiment 1 will not be described repeatedly.

[0051] Combination Figure 1 See also Figure 2 As shown, the battery pack 2 provided in this embodiment includes a box body 20 and a battery assembly 1, and the battery assembly 1 is arranged in the box body 20. Thus, the battery assembly 1 is accommodated, supported and protected by the box body 20. Among them, the box body 20 can be configured to be made of metal material, Figure 2 In order to more clearly illustrate the battery assembly 1 in the battery pack 2, only the lower case portion of the case 20 is shown, and the upper case portion of the case 20 is omitted.

[0052] In addition, the connection circuit of the battery assembly 1 is also used to connect with the connection circuits of other adjacent battery assemblies 1 and form an electrical connection, so that multiple battery assemblies 1 are connected into a high-voltage circuit.

[0053] Optionally, the battery pack 2 further includes a distribution box with a fuse, and the distribution box is connected to the high-voltage circuit, so that the fuse in the distribution box provides fuse protection for the battery pack 2.

[0054] In an optional solution of this embodiment, a plurality of battery assemblies 1 are provided, and the plurality of battery assemblies 1 are provided in the box body 20. Specifically, the plurality of battery assemblies 1 can be built into the box body 20 in a module form, or can be built into the box body 20 in a module-free form, which is not limited here.

[0055] In this embodiment, the first single cells 10 and the second single cells 11 in multiple battery assemblies 1 can be arranged according to the same or different rules, so that the arrangement rules of the first single cells 10 and the second single cells 11 in each battery assembly 1 can be configured according to the specific performance requirements of the battery pack 2, including but not limited to the number of arrangement columns of the first single cells 10 and the second single cells 11 in each battery assembly 1 and the battery arrangement rules in each column.

[0056] The battery pack in this embodiment has the advantages of the battery assembly in the first embodiment, and the advantages of the battery assembly disclosed in the first embodiment will not be repeated here.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit them; although the utility model is described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein by equivalent; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the utility model. In addition, those skilled in the art can understand that although some embodiments described herein include certain features included in other embodiments instead of other features, the combination of features of different embodiments means that they are within the scope of the utility model and form different embodiments. For example, any one of the embodiments claimed for protection can be used in any combination. The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the utility model, and should not be regarded as an admission or in any form of implication that the information constitutes prior art known to those skilled in the art.

Claims

1. A battery assembly, characterized in that: It includes a connecting circuit, a first single cell and a second single cell; The first single cell has a safety device, and the second single cell does not have a safety device; The first single battery and the second single battery are both electrically connected to the connection circuit.

2. The battery assembly according to claim 1, characterized in that: The first single battery cells and the second single battery cells are arranged in a row along a predetermined direction; At least one second unit battery is disposed on one side of the first unit battery along the predetermined direction.

3. The battery assembly according to claim 2, characterized in that: A plurality of the second unit batteries are arranged on one side of the first unit battery along the predetermined direction.

4. The battery assembly according to claim 2, characterized in that: The number of the first single battery cells is plural.

5. The battery assembly according to claim 1, characterized in that: The number of the first single cells is not greater than the number of the second single cells.

6. The battery assembly according to claim 1, characterized in that: The housing of the first unit battery and the housing of the second unit battery are configured differently.

7. The battery assembly according to claim 1, characterized in that: The safety device is a fuse-type safety device.

8. A battery pack, characterized in that: A battery assembly comprising a box and any one of claims 1 to 7; The battery assembly is arranged in the box.

9. The battery pack according to claim 8, characterized in that: The battery assembly is provided in plurality, and the plurality of battery assemblies are arranged in the box.

10. The battery pack according to claim 9, characterized in that: The first single cells and the second single cells in the plurality of battery assemblies are arranged in the same or different rules.

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