Battery pack with short circuit protection

Abstract

The utility model relates to the technical field of battery packs, and provides a battery pack with a short-circuit protection function. The PCB comprises a first circuit area A and a second circuit area A disconnected with the first circuit area A; the first connecting sheet is connected with the battery cell assembly and the first circuit area A; the PCB, the aluminum substrate and the cell assembly are sequentially stacked in a first direction and are relatively fixed, the aluminum substrate comprises a first circuit area B, a second circuit area B and a fuse for connecting the first circuit area B and the second circuit area B, the aluminum substrate and the PCB are relatively fixed, the first circuit area A is connected with the first circuit area B, and the second circuit area A is connected with the second circuit area B. Therefore, the battery pack has a short-circuit protection function, and can quickly disperse and cool heat generated when the fuse is fused, so as to protect other electrical parts.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery pack technical field especially, relate to a kind of battery pack with short-circuit protection. BACKGROUND

[0002] Battery Pack is by the integral unit of multiple battery module assembly, for storing and providing electric energy.It is higher level component in battery system, usually by several battery module, connector, battery management system (Battery Management System, is called BMS), heat dissipation system, electrical interface and shell etc.

[0003] To ensure the use safety of battery pack, generally, its inside is provided with fuse, when the current in circuit exceeds specified value certain time, fuse itself can generate heat, and this heat can make fuse itself fuse, to cut off circuit, play the role of protecting other electronic components in circuit.

[0004] But in existing battery pack, after fuse fuses, the heat generated by it is concentrated in fuse, since heat is too concentrated, this heat cooling speed is slow, and it is easy to cause damage to its surrounding electronic devices.

[0005] Therefore, battery pack with short-circuit protection is needed to solve the above technical problems. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a kind of battery pack with short-circuit protection, can have short-circuit protection function, and can quickly disperse and cool the heat generated when fuse fuses, protect other electrical components.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] Battery pack with short-circuit protection, comprising:

[0009] Battery cell assembly, the above-mentioned battery cell assembly includes battery cell total positive;

[0010] PCB board, the above-mentioned PCB board includes first circuit area A, and second circuit area A disconnected with the above-mentioned first circuit area A;

[0011] First connecting sheet, the above-mentioned first connecting sheet connects the above-mentioned battery cell total positive with the above-mentioned first circuit area A;

[0012] The aluminum substrate is stacked and fixed in sequence with the PCB and the battery cell assembly in the first direction, and comprises a first circuit area B and a second circuit area B, and a fuse connecting the first circuit area B and the second circuit area B. The aluminum substrate is fixed relative to the PCB, the first circuit area A is connected to the first circuit area B, the second circuit area A is connected to the second circuit area B, and the current in the battery cell assembly can flow through the first connecting piece, the first circuit area A, the first circuit area B, the fuse, the second circuit area B, and the second circuit area A in sequence.

[0013] The first direction is parallel to the thickness direction of the PCB.

[0014] As a preferred technical solution of the battery pack with short circuit protection, one end of the first connecting piece is welded and fixed to the positive terminal of the battery cell.

[0015] And / or, the other end of the first connecting piece is welded and fixed to the first circuit area A.

[0016] As a preferred technical solution of the battery pack with short circuit protection, one end of the first connecting piece penetrates the aluminum substrate and is inserted into the PCB and fixed.

[0017] As a preferred technical solution of the battery pack with short circuit protection, the battery cell assembly protrudes a first limiting part, and the first limiting part is inserted into the aluminum substrate along the first direction.

[0018] As a preferred technical solution of the battery pack with short circuit protection, the battery cell assembly protrudes a second limiting part, and the second limiting part is inserted into the first connecting piece along a second direction, and the first direction is perpendicular to the second direction.

[0019] As a preferred technical solution of the battery pack with short circuit protection, the battery cell assembly is provided with a first installation slot, and part of the first connecting piece can be inserted into the first installation slot.

[0020] As a preferred technical solution of the battery pack with short circuit protection, the PCB and the battery cell assembly are fixed by a threaded fastener.

[0021] As a preferred technical solution of the battery pack with short circuit protection, it further comprises a second connecting piece, the battery cell assembly comprises a plurality of battery cells, all the battery cells are connected in series through the second connecting piece to form the positive terminal of the battery cell.

[0022] As a preferred technical solution of the battery pack with short circuit protection, one end of the second connecting piece is welded and fixed to the battery cell, and the other end is inserted into the PCB.

[0023] As a kind of preferred technical scheme of the battery pack with short-circuit protection described above, further comprising output terminal, the output terminal is connected with the second circuit area B of the PCB board.

[0024] The utility model has the advantages of:

[0025] The cell assembly is used to store electric energy, and includes a plurality of cells, which are connected in series; the positive terminal of the series circuit is the total positive terminal of the cells; the PCB board is provided with a circuit, which can distribute electric energy after obtaining electric energy from the cell assembly; however, if short circuit occurs, excessive current passing through will cause damage to the circuit, resulting in the scrap of the PCB board; therefore, in the embodiment, the PCB board is provided with a first circuit area A and a second circuit area A, and the first circuit area A is disconnected with the second circuit area A; an aluminum substrate is further provided, which is clamped between the cell assembly and the PCB board in the first direction; the aluminum substrate is provided with a first circuit area B and a second circuit area B, and a fuse for connecting the first circuit area B and the second circuit area B; the first circuit area B is electrically connected with the first circuit area A, and the second circuit area B is electrically connected with the second circuit area A; the first circuit area A obtains electric energy from the total positive terminal of the cells of the cell assembly through the first connecting piece; the current in the cell assembly can flow through the first connecting piece, the first circuit area A, the first circuit area B, the fuse, the second circuit area B and the second circuit area A in sequence; when short circuit occurs, the fuse can be fused to disconnect the circuit and protect the remaining parts in the circuit; further, a large amount of heat is generated when the fuse is fused, and the heat can be quickly diffused through the aluminum substrate and dissipated, so that the heat concentration can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the drawings needed to be used in the description of the embodiments of the utility model will be briefly introduced as follows: obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the contents of the embodiments of the utility model and these drawings by those skilled in the art without creating labor.

[0027] Figure 1 is a structural schematic diagram of the battery pack with short-circuit protection provided by the embodiments of the utility model;

[0028] Figure 2 is a side view of the battery pack with short-circuit protection provided by the embodiments of the utility model;

[0029] Figure 3 is an explosion view of the battery pack with short-circuit protection (except output terminal) provided by the embodiments of the utility model;

[0030] Figure 4 is a structural schematic diagram of a PCB provided by an embodiment of the present application;

[0031] Figure 5 is a structural schematic diagram of an aluminum substrate provided by an embodiment of the present application.

[0032] In the figure:

[0033] X, first direction; Y, second direction; Z, third direction;

[0034] 100, battery cell assembly; 110, battery cell; 111, battery cell total positive; 120, retainer; 121, first limiting portion; 122, second limiting portion; 123, first mounting groove;

[0035] 200, PCB; 210, first circuit area A; 220, second circuit area A;

[0036] 300, first connecting sheet;

[0037] 400, aluminum substrate; 410, first circuit area B; 420, second circuit area B; 430, fuse;

[0038] 500, second connecting sheet;

[0039] 600, output terminal;

[0040] 700, threaded fastener. DETAILED DESCRIPTION

[0041] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, and not to limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, rather than all the structures.

[0042] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the utility model, unless another definite provision and limitation, first feature is in second feature "on" or "under" can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them. Moreover, first feature is in second feature "on", "above" and "upper surface" includes that first feature is in second feature directly above and obliquely above, or only indicates that first feature horizontal height is higher than second feature. First feature is in second feature "under", "below" and "under" includes that first feature is in second feature directly below and obliquely below, or only indicates that first feature horizontal height is less than second feature.

[0044] In the description of the embodiment, the terms "upper", "lower", "right", "left", "horizontal", "vertical", and "radial" refer to the orientation or position relationship shown in the drawings, which is only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0045] As shown in Figures 1 to 5 The utility model provides a kind of battery pack with short circuit protection, including electric core subassembly 100, PCB board 200, first connecting sheet 300 and aluminum substrate 400. Among them, electric core subassembly 100 includes electric core total positive 111;PCB board 200 includes first circuit area A210, and second circuit area A220 disconnected with first circuit area A210;First connecting sheet 300 connects electric core total positive 111 with first circuit area A210;PCB board 200, aluminum substrate 400 and electric core subassembly 100 are sequentially stacked and relatively fixed in first direction X, aluminum substrate 400 includes first circuit area B410 and second circuit area B420, and fuse 430 connecting first circuit area B410 with second circuit area B420, aluminum substrate 400 is relatively fixed with PCB board 200, first circuit area A210 is connected with first circuit area B410, second circuit area A220 is connected with second circuit area B420, current in electric core subassembly 100 can sequentially flow through first connecting sheet 300, first circuit area A210, first circuit area B410, fuse 430, second circuit area B420 and second circuit area A220, first direction X is parallel with the thickness direction of PCB board 200.

[0046] Exemplarily, the battery cell assembly 100 is used for storing electric energy, and a plurality of battery cells 110 are included in the battery cell assembly 100, the plurality of battery cells 110 are connected in series in sequence, and a positive electrode end of the series circuit is a total positive electrode 111; a circuit is arranged on the PCB board 200, and after electric energy is obtained from the battery cell assembly 100, the electric energy can be distributed; however, if a short circuit occurs, an excessively large current passing through can cause damage to the circuit, resulting in the scrap of the PCB board 200. Therefore, in the embodiment, the PCB board 200 is provided with a first circuit area A210 and a second circuit area A220, and the first circuit area A210 is disconnected with the second circuit area A220; an aluminum base plate 400 is further arranged, the aluminum base plate 400 is clamped between the battery cell assembly 100 and the PCB board 200 in the first direction X, and the aluminum base plate 400 is correspondingly provided with a first circuit area B410 and a second circuit area B420, and a fuse 430 for connecting the first circuit area B410 and the second circuit area B420, the first circuit area B410 is electrically connected with the first circuit area A210, the second circuit area B420 is electrically connected with the second circuit area A220, the first circuit area A210 obtains electric energy from the total positive electrode 111 of the battery cell assembly 100 through the first connecting piece 300, and the current in the battery cell assembly 100 can flow through the first connecting piece 300, the first circuit area A210, the first circuit area B410, the fuse 430, the second circuit area B420 and the second circuit area A220 in sequence, when a short circuit occurs, the fuse 430 can be fused to disconnect the circuit and protect the rest of the circuit. Further, when the fuse 430 is fused, a large amount of heat is generated, the heat can be quickly diffused through the aluminum base plate 400 and radiated, so that the heat concentration can be avoided.

[0047] Optionally, one end of the first connecting piece 300 is welded and fixed with the total positive electrode 111; and / or, the other end of the first connecting piece 300 is welded and fixed with the first circuit area A210.

[0048] Exemplarily, in the embodiment, the two ends of the first connecting piece 300 are welded and fixed with the total positive electrode 111 and the first circuit area A210 respectively. Through the welding fixing mode, the stability and firmness are stronger, so that the first connecting piece 300 can always maintain the communication between the total positive electrode 111 and the first circuit area A210, and the generation of poor contact is reduced.

[0049] Optionally, one end of the first connecting piece 300 penetrates through the aluminum base plate 400 and is inserted and fixed with the PCB board 200.

[0050] Specifically, the aluminum substrate 400 is provided with a first avoiding opening, the PCB board 200 is provided with a first inserting opening, one end of the first connecting piece 300 can pass through the first avoiding opening and penetrate the aluminum substrate 400, and then is inserted into the first inserting opening and fixed with the PCB board 200. In this way, the first connecting piece 300 can limit the aluminum substrate 400 and the PCB board 200, and keep the relative positions of the three fixed.

[0051] Optionally, the battery cell assembly 100 is provided with a first limiting part 121, and the first limiting part 121 is inserted into the aluminum substrate 400 along the first direction X. In this way, the battery cell assembly 100 is inserted into the aluminum substrate 400 through the first limiting part 121, which can limit the relative movement of the aluminum substrate 400 relative to the battery cell assembly 100 in directions other than the first direction X, and in the first direction X, the aluminum substrate 400 is clamped between the PCB board 200 and the battery cell assembly 100, so that the aluminum substrate 400 is difficult to separate from the first limiting part 121 along the first direction X. In this way, the relative positions of the battery cell assembly 100, the PCB board 200 and the aluminum substrate 400 can be kept stable.

[0052] Optionally, the battery cell assembly 100 is provided with a second limiting part 122, and the second limiting part 122 is inserted into the first connecting piece 300 along the second direction Y, and the first direction X is perpendicular to the second direction Y. In this way, the battery cell assembly 100 is inserted into the first connecting piece 300 through the second limiting part 122, which can limit the relative movement of the first connecting piece 300 relative to the battery cell assembly 100 in directions other than the second direction Y. In this way, the relative fixation of the first connecting piece 300 and the battery cell assembly 100 can be maintained, and the first connecting piece 300 and the battery cell assembly 100 can be prevented from separating.

[0053] Optionally, the battery cell assembly 100 is provided with a first mounting groove 123, and part of the first connecting piece 300 can be inserted into the first mounting groove 123. In this way, the first connecting piece 300 can keep relative stability with the battery cell assembly 100 by being inserted into the first mounting groove 123.

[0054] Preferably, in the projection of the first direction X and / or the projection of the third direction Z, the outer side wall of the first connecting piece 300 is coplanar with the opening end surface of the first mounting groove 123, or the outer side wall of the first connecting piece 300 is located in the first mounting groove 123. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0055] Optionally, the PCB board 200 and the battery cell assembly 100 are fixed by a threaded fastener 700. In this way, the fixing structure of the PCB board 200 and the battery cell assembly 100 is simple, and it is convenient to disassemble and assemble, and it is convenient to replace when the fuse 430 of the aluminum substrate 400 is fused.

[0056] Exemplarily, the battery cell assembly 100 comprises the battery cell 110 and the holder 120, the battery cell 110 is provided with a plurality of battery cells 110, the battery cell 110 is in a cylindrical shape, the axes of all the battery cells 110 are parallel to the second direction Y, and all the battery cells 110 are arranged in sequence along the third direction Z. The holder 120 is provided with two holders 120, which are symmetrically arranged in the second direction Y, the battery cell 110 is inserted into the two holders 120 at the two ends in the second direction Y respectively, and the holder 120 maintains the relative position of the battery cell 110. The first limiting part 121, the second limiting part 122 and the first mounting groove 123 are all arranged on the holder 120, so that the universality of the battery cell 110 is stronger.

[0057] Optionally, the battery pack with short circuit protection further comprises a second connecting sheet 500, the battery cell assembly 100 comprises a plurality of battery cells 110, all the battery cells 110 are connected in series through the second connecting sheet 500, and the battery cell total positive electrode 111 is formed.

[0058] Exemplarily, the battery cell assembly 100 comprises n battery cells 110, n≥2, the battery cell 110 comprises n-1 battery cells 110, the electrodes of two adjacent battery cells 110 are reversely arranged, that is, the positive electrode of the battery cell 110 in the first order and the negative electrode of the battery cell 110 in the second order are located on the same side in the second direction Y, and the two adjacent battery cells 110 are connected in series through the second connecting sheet 500. In this way, among the battery cell 110 in the first order and the battery cell 110 in the n order, the positive electrode not connected with the second connecting sheet 500 is the battery cell total positive electrode 111, and the negative electrode not connected with the second connecting sheet 500 is the battery cell total negative electrode.

[0059] Optionally, one end of the second connecting sheet 500 is welded and fixed with the battery cell 110, and the other end is inserted into the PCB board 200. In this way, the stability of the series connection circuit in the battery cell assembly 100 can be maintained, and the second connecting sheet 500 can also limit the PCB board 200.

[0060] Optionally, the battery pack with short circuit protection further comprises an output terminal 600, and the output terminal 600 is connected with the second circuit area B420 of the PCB board 200. In this way, the electric energy of the battery cell assembly 100 can be output through the output terminal 600.

[0061] In addition, the above is only a preferred embodiment of the present application and the technical principle applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the protection scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A battery pack with short circuit protection, characterized by, The application relates to a battery pack, which comprises: an electric core assembly (100) comprising an electric core total positive (111); a PCB board (200) comprising a first circuit area A (210) and a second circuit area A (220) disconnected with the first circuit area A (210); a first connecting sheet (300) connecting the electric core total positive (111) and the first circuit area A (210); an aluminum base plate (400) stacked and fixed in a first direction (X) in sequence with the PCB board (200) and the electric core assembly (100), wherein the aluminum base plate (400) comprises a first circuit area B (410) and a second circuit area B (420), and a fuse (430) connecting the first circuit area B (410) and the second circuit area B (420), the aluminum base plate (400) is fixed relative to the PCB board (200), the first circuit area A (210) is connected with the first circuit area B (410), the second circuit area A (220) is connected with the second circuit area B (420), and the current in the electric core assembly (100) can flow through the first connecting sheet (300), the first circuit area A (210), the first circuit area B (410), the fuse (430), the second circuit area B (420) and the second circuit area A (220) in sequence; the first direction (X) is parallel to the thickness direction of the PCB board (200).

2. The battery pack with short circuit protection according to claim 1, wherein, One end of the first connecting sheet (300) is welded and fixed with the electric core total positive (111); and / or, the other end of the first connecting sheet (300) is welded and fixed with the first circuit area A (210).

3. The battery pack with short circuit protection according to claim 1, wherein, One end of the first connecting sheet (300) is inserted into the PCB board (200) after penetrating through the aluminum base plate (400) and is fixed.

4. The battery pack with short circuit protection of claim 1, wherein, The electric core assembly (100) is provided with a first limiting part (121) which is inserted into the aluminum base plate (400) along the first direction (X).

5. The battery pack with short circuit protection of claim 1, wherein, The electric core assembly (100) is provided with a second limiting part (122) which is inserted into the first connecting sheet (300) along a second direction (Y), and the first direction (X) is perpendicular to the second direction (Y).

6. The battery pack with short circuit protection of claim 1, wherein, The electric core assembly (100) is provided with a first mounting groove (123), and part of the first connecting sheet (300) can be inserted into the first mounting groove (123).

7. The battery pack with short circuit protection of claim 1, wherein, The PCB board (200) and the electric core assembly (100) are fixed by a threaded fastener (700).

8. The battery pack with short circuit protection of claim 1, wherein, The application further comprises a second connecting sheet (500), the electric core assembly (100) comprises a plurality of electric cores (110), all the electric cores (110) are connected in series by the second connecting sheet (500), and the electric core total positive (111) is formed.

9. The battery pack with short circuit protection according to claim 8, wherein, One end of the second connecting sheet (500) is welded and fixed with the electric core (110), and the other end is inserted into the PCB board (200).

10. The battery pack with short circuit protection according to any one of claims 1-9, wherein, Also included is an output terminal (600) connected with the second circuit area B (420) of the PCB board (200).

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