Battery pack

Abstract

The utility model provides a battery pack which comprises a plurality of batteries which are arranged in a stacked mode. The end plates are located at the ends of the batteries which are arranged in a stacked mode, a plurality of connecting plates are integrally formed on the end plates, and a connecting groove is defined by the connecting plates; a connecting hole is formed in the end plate, is positioned in the connecting groove and is used for connecting an output electrode of a battery pack; a communication opening is formed in the side, back on to the battery, of the connecting groove. According to the technical scheme, when the output electrode of the battery pack is fixedly connected to the end plate, the output electrode is firstly arranged in the connecting groove, the output electrode is primarily limited through the arranged connecting plate, and when the output electrode is fixed by using a bolt subsequently, the stability of the position of the output electrode is relatively conveniently kept; and the convenience of fixing operation on the output pole is improved.

Description

Technical Field

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

[0002] The battery pack consists of a module frame (battery box), several connected batteries arranged in the module frame, and an acquisition circuit for detecting the voltage and temperature status of the battery. In addition, it also includes an output pole, which serves as a transmission path between the battery and the outside. The output pole is connected to the battery's ear and extends to the outside of the module frame, providing an energy transmission channel to connect with external components.

[0003] The acquisition circuit and output pole need to be fixed on the end plate. For example, the output pole is a tab support, which is used to electrically connect to the tab of the battery and connect to the outside of the battery pack to achieve energy transfer between the battery and external components. The tab support is fixed to the upper surface of the end plate (the surface of the end plate facing the opening of the box), and the two are generally fixedly connected by bolts. However, in actual operation, it is inconvenient to position and fix. Utility Model Content

[0004] The present application provides a battery pack, which makes it easier to position and fix the output pole when the battery pack is assembled, thereby improving the convenience of fixed connection between the output pole and the end plate.

[0005] The present application provides a battery pack, comprising:

[0006] A plurality of batteries, wherein the plurality of batteries are arranged in a stacked manner;

[0007] An end plate, located at the end of the stacked batteries, with a plurality of connecting plates integrally formed on the end plate, and the plurality of connecting plates surrounding each other to form a connecting groove;

[0008] A connecting hole is provided on the end plate, and the connecting hole is located in the connecting groove and is used to connect the output pole of the battery pack;

[0009] A communication opening is provided on a side of the connection groove facing away from the battery.

[0010] In the above technical solution, when the output pole of the battery pack is fixedly connected to the end plate, the output pole is first placed in the connecting groove, and the output pole is initially limited by the set connecting plate. When the output pole is subsequently fixed with bolts, it is more convenient to maintain the stability of the output pole position, thereby improving the convenience of fixing the output pole.

[0011] In a specific possible implementation manner, a baffle is fixedly connected to the end plate, and the baffle is located at the communication opening.

[0012] In the above technical solution, a baffle is arranged at the connecting opening, and the bus, signal acquisition board and other components can be fixed on the upper side of the connecting groove later. The baffle arranged at the connecting opening can play a good auxiliary supporting role, that is, a supporting structure is arranged around the ring to avoid the problem of one side being unable to provide support, thereby improving the stability of supporting and fixing the components installed later.

[0013] In a specific possible implementation mode, an avoidance gap is provided between the baffle plate and the connecting plate.

[0014] In the above technical solution, the avoidance gap is left to facilitate the connection of the output pole installed in the connecting groove with other components through electrical connection structures such as leads. Compared with the situation of leading out from the upper opening of the connecting groove, the bending of structures such as leads is reduced, and the risk of damage to connection structures such as leads is reduced.

[0015] In a specific possible implementation manner, the plurality of single cells are arranged into a plurality of columns, and two adjacent columns form a group;

[0016] The connection slots correspond to each column of the batteries one by one, and the connection slots corresponding to the batteries in two columns of the same group form a group;

[0017] The communicating openings of the two connecting grooves in the same group are connected, and the two connecting grooves share a baffle.

[0018] In the above technical solution, the number of independent components in the end plate structure is reduced, and two adjacent connection grooves share a baffle plate, which can simplify the operating procedures in the actual production process and improve production efficiency.

[0019] In a specific possible implementation manner, the plurality of connecting plates include at least a first connecting plate and a second connecting plate, and the first connecting plate and the second connecting plate are located on two sides of the connecting groove facing away from each other;

[0020] The first connecting plate and the second connecting plate are both provided with limiting grooves on their surfaces facing the connecting groove for the output poles of the battery pack to be inserted into.

[0021] In the above technical solution, the output pole is set in the connecting groove. When it is adapted to the opened connecting hole, the limiting groove cooperates to limit the output pole, which can further improve the stability of the relative position of the output pole and the end plate, and reduce the occurrence of offset, loose fixation and other problems.

[0022] In a specific possible implementation scheme, a plurality of the limiting grooves in the same connecting groove having the same distance from the end plate form a group;

[0023] At least two groups of the limiting grooves are arranged in the same connecting groove, and the plurality of groups of the limiting grooves are arranged at intervals in the direction approaching and away from the end plate.

[0024] In the above technical solution, limiting grooves are provided at different positions from the end plate, so that the clamping structure on the output pole can be adapted to different positions, thereby improving applicability.

[0025] In a specific embodiment, it further comprises a cable tie, and the end plate and the battery are fastened together by the cable tie.

[0026] In a specific possible implementation scheme, a limit block for limiting the position of the cable tie is provided on the end plate;

[0027] The limiting block is located on a side of the cable tie facing outside the end plate.

[0028] In the above technical solution, the cable tie is limited by a limit block to prevent the cable tie from being offset relative to the end plate and detaching from the end plate and the battery, thereby improving the firmness and stability of the cable tie used to tie and fix the end plate and the battery.

[0029] In a specific embodiment, the dimension of the end plate in the first direction is w, and the dimension of the plurality of batteries in the first direction in a stacked state is W;

[0030] w and W satisfy: W≤w≤1.1W;

[0031] The first direction is parallel to the large surface of the battery and perpendicular to the stacking direction of the battery.

[0032] In the above technical solution, the size of the end plate is set to meet the corresponding proportional relationship to ensure that the end plate can completely cover the battery, provide stable support and limit the battery, and avoid the problem of uneven pressure on the large surface of the battery due to the small size of the end plate; in addition, it can also avoid the problem of serious waste due to the end plate being too large.

[0033] In a specific embodiment, the dimension of the end plate in the second direction is t, and the dimension of the plurality of batteries in the second direction in a stacked state is L;

[0034] t and L satisfy: 0.05L≤t≤0.1L;

[0035] The second direction is the direction in which the batteries are stacked.

[0036] In the above technical solution, the thickness of the end plate is set to be no less than 0.05L to ensure that it has sufficient structural strength to provide stable support and better protection for the battery. At the same time, it is avoided that the thickness of the end plate is greater than 0.1L, which causes waste of materials and reduced energy density of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of a battery pack provided in an embodiment of the present application;

[0038] Figure 2 A schematic diagram of the structure of the end plate provided in the embodiment of the present application;

[0039] Figure 3 Provided in the embodiments of this application Figure 2 A magnified schematic diagram of part B;

[0040] Figure 4 Provided in the embodiments of this application Figure 1 Enlarged schematic diagram of part A.

[0041] Explanation of the accompanying drawings: 1. Battery; 2. End plate; 21. Connection hole; 22. Weight reduction groove; 23. Reinforcing rib; 24. Lifting hole; 3. Connection plate; 31. Connection groove; 32. Connecting opening; 33. Avoidance gap; 34. Limiting groove; 4. Baffle; 5. Cable tie; 6. Limiting block. DETAILED DESCRIPTION

[0042] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0043] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0044] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0045] To facilitate understanding of the battery pack provided in the embodiments of the present application, the structure of the battery pack is first briefly described. The battery pack includes a plurality of connected batteries and an acquisition circuit for detecting the voltage and temperature state of the batteries. The plurality of batteries are stacked and arranged into several columns. In addition, end plates and side plates are provided, and the end plates and side plates are cooperated to wrap around the outside of the batteries to form a battery pack. Of course, only end plates may be provided, and the end plates and batteries may be fixed by straps, cable ties and other structures to form a battery pack.

[0046] In addition, the battery pack also includes a tab support fixed on the end plate, and the tab support is provided with a conductive sheet. The tab of the battery is connected to the tab support after being electrically connected, and electrical transmission with external components is achieved through the conductive sheet on the tab support. When the tab support is fixed to the end plate, bolts are generally used for fixing. It is necessary to determine the position of the tab support on the end plate, and keep the tab support stable during subsequent operations to avoid offset, which brings more inconvenience to specific operations.

[0047] The embodiment of the present application provides a battery pack, which makes it easy to fix the tab support on the end plate and improves the operation efficiency. The following is a detailed description of the embodiment in conjunction with specific drawings and embodiments.

[0048] refer to Figure 1 , Figure 1 The schematic diagram of the structure of the battery pack 1 provided in the embodiment of the present application is shown. The battery pack provided in the embodiment of the present application includes a battery 1 and an end plate 2, wherein there are multiple batteries 1, the multiple batteries 1 are arranged in a stacked shape, and the multiple batteries 1 are conductively connected through a busbar; specifically, the multiple batteries 1 can be arranged in any number such as one column, two columns, or three columns; there are two end plates 2, which are located at the ends of the batteries 1 arranged in a column, and the batteries 1 are fixedly connected to the end plates 2; illustratively, the end plates 2 are located at the two ends of each column of batteries 1 that are away from each other in the stacking direction of the batteries 1 in the column.

[0049] refer to Figure 2 and Figure 3 A plurality of connecting plates 3 are integrally formed on the end plate 2, and the plurality of connecting plates 3 are arranged to form a connecting groove 31. A connecting opening 32 is provided on the side of the connecting groove 31 facing away from the battery 1. A connecting hole 21 is also provided on the end plate 2. The connecting hole 21 is located in the connecting groove 31 and is used to connect the output pole of the battery pack 1. In the embodiment of the present application, the output pole of the battery pack 1 is described by taking the pole ear support as an example.

[0050] When fixing the pole lug support on the end plate 2, first place the pole lug support in the connecting groove 31, and then use bolts to fix the pole lug support. The bolts used are inserted into the connecting hole 21 and fixedly connected to the end plate 2. When using bolts to fix the pole lug support, the pole lug support is relatively positioned with the end plate 2 through the set connecting groove 31, and the pole lug support is pre-positioned, making subsequent fixing operations more convenient, avoiding the problem of positional displacement, improving the convenience of assembly operations, and increasing work efficiency.

[0051] In addition, a connecting opening 32 can be opened on the side of the connecting groove 31 away from the battery 1. When the pole ear support is located in the connecting groove 31, the lead wires and other structures connected to the pole ear support pass through the connecting opening 32, which can reduce the risk of serious bending of the lead wires and other structures when they are led out from the top of the connecting groove 31, and can reduce the risk of damage to the lead wires and other structures.

[0052] refer to Figure 2 A baffle plate 4 is fixedly connected to the end plate 2 and is located at the connecting opening 32 ; and an avoidance gap 33 is still left between the baffle plate 4 and the connecting plate 3 , that is, the baffle plate 4 only blocks part of the connecting opening 32 .

[0053] The battery 1 package structure also includes a collection component for collecting information such as the voltage and temperature of the battery 1. The collection component is fixedly connected to the end plate 2 and connected to multiple batteries 1. When the connection groove 31 is set, the collection component is fixed on the upper side of the connection plate 3, which can improve the integration of the components. The baffle 4 is set at the connecting opening 32, so that support can be provided at all positions around the ring, avoiding the problem of loose fixation due to the lack of a fixed foundation on one side, and can provide a more stable support for the set collection component. The avoidance gap 33 is set for the layout of structures such as the lead on the tab support to reduce the risk of damage to the lead.

[0054] The number of connecting slots 31 on each end plate 2 is the same as the number of columns formed by the arrangement of the multiple batteries 1, and each connecting slot 31 corresponds to each column of batteries 1 one by one; when the multiple batteries 1 are arranged in multiple columns, two adjacent columns of batteries 1 are a group, and correspondingly, the two connecting slots 31 corresponding to the two columns of batteries 1 in the same group are a group; the connecting openings 32 of the two connecting slots 31 in the same group are connected, and the two connecting slots 31 share a baffle 4, that is, the baffle 4 is located in the connecting openings 32 of the two connecting slots 31, and the avoidance gap 33 between the baffle 4 and the connecting plate 3 is located on the outside of the two connecting openings 32 (that is, on the side away from the other connecting slot 31 in the same group).

[0055] When the batteries 1 are arranged in multiple rows, the components are designed to be integrated to reduce the number of separately arranged structures. Compared with the situation where two connecting grooves 31 are originally separately arranged and two baffle plates 4 need to be separately arranged, the two connecting grooves 31 are formed into a group and arranged adjacent to each other, sharing a baffle plate 4, thereby simplifying the overall complexity of the structure, reducing the risk of failure and damage, simplifying the production process, and improving production efficiency.

[0056] In addition, reference Figure 3The plurality of connecting plates 3 at least include a first connecting plate 3a and a second connecting plate 3b, and the first connecting plate 3a and the second connecting plate 3b are located on two sides of the connecting groove 31 that are away from each other; the first connecting plate 3a and the second connecting plate 3b are provided with a limiting groove 34 on the surface facing the connecting groove 31 for the output pole of the battery pack to be inserted into. When the tab support is installed in the connecting groove 31, the tab support is firstly limited by the limiting groove 34, so that the stability of the tab support can be ensured before the tab support is subsequently fixed with bolts.

[0057] The tab support is snapped into the limiting groove 34 as referred to here, which means that the snap-fit ​​structure provided on the tab support is snapped into the limiting groove 34. The specific structure here can refer to the snap-fit ​​structure used in the relevant field. Exemplarily, an elastic snap-fit ​​is provided on the tab support. In the process of installing the tab support into the connecting groove 31, the elastic snap-fit ​​abuts against the connecting plate 3, and the connecting plate 3 squeezes the elastic snap-fit. When the tab support is moved to the position corresponding to the elastic snap-fit ​​and the limiting groove 34, the elastic snap-fit ​​is snapped into the limiting groove 34 under the action of its own elasticity, so as to realize the snap-fit ​​limiting of the tab support; and the limiting groove 34 is arranged on two opposite sides of the connecting groove 31, which can improve the stability of limiting the tab support.

[0058] Two limiting grooves 34 with the same minimum distance from the end plate 2 in the same connection groove 31 are a group. Of course, in other embodiments, the number of limiting grooves 34 with the same minimum distance from the end plate 2 may also be one, three, four, etc. In the embodiment of the present application, two are taken as an example for explanation; at least two groups of limiting grooves 34 are set in the same connection groove 31, and multiple limiting grooves 34 are arranged at intervals in the direction close to and away from the end plate 2. In this way, in actual design, the distances of multiple groups of limiting grooves 34 from the end plate 2 can be set according to the models of different types of pole lug supports. When the end plate 2 is designed and produced, it is not necessary to differentiate the design of the clamping structure on the limiting groove 34. Different types of pole lug supports and the corresponding connection grooves 31 do not need to differentiate the design of the limiting groove 34 and the clamping structure position on the pole lug support in actual design, which can save costs and reduce workload.

[0059] The shape of the limiting groove 34 can be selected according to actual needs and can be set to different shapes such as a quadrilateral, a pentagon, etc., as long as it can achieve stable limiting of the tab support.

[0060] refer to Figure 1 The battery pack also includes a cable tie 5, and the end plate 2 and the battery 1 are tied and fixed by the cable tie 5, which can conveniently achieve relative fixation of the end plate 2 and the battery 1.

[0061] refer to Figure 1 and Figure 4The end plate 2 is provided with a limit block 6 for limiting the position of the cable tie 5, and the limit block 6 is located on the side of the cable tie 5 facing the outside of the end plate 2. Exemplarily, two cable ties 5 are provided, which are respectively located at the upper and lower edges of the end plate 2. For the upper cable tie 5, the corresponding limit block 6 is located on the upper side of the cable tie 5; for the lower cable tie 5, the corresponding limit block 6 is located on the lower side of the cable tie 5. It can limit the cable tie 5 from detaching from the end plate 2, ensuring the firmness and stability of the cable tie 5 in binding and fixing the end plate 2 and the battery 1.

[0062] The dimension of the end plate 2 in the first direction is w, and the dimension of the end plate 2 in the first direction when multiple batteries 1 are stacked is W, and w and W satisfy: W≤w≤1.1W; wherein the first direction is parallel to the large surface of the battery 1 and is perpendicular to the stacking direction of the multiple batteries 1 in a row; when there are multiple columns of batteries 1, the first direction is the arrangement direction of the multiple columns of batteries; illustratively, when the poles of the battery 1 are facing upward, the first direction is the horizontal direction.

[0063] In the embodiment of the present application, taking two columns of batteries 1 as an example, W is the size of the two columns of batteries 1 in the first direction. The size of the end plate 2 is set to satisfy the corresponding relationship, which can ensure that the end plate 2 can completely cover the battery 1, ensure the firmness of the end plate 2 fixing the battery 1, and completely cover the battery 1, and can also provide better protection for the battery 1 to avoid the problem of collision between the battery 1 and the external structure.

[0064] In addition, the dimension of the end plate 2 in the second direction is t, the dimension of each column of the stacked batteries 1 in the second direction is L, and t and L satisfy: 0.05L≤t≤0.1L; wherein the second direction is the stacking direction of each column of batteries 1. It can ensure that the end plate 2 plays a stable supporting role for the inner battery 1 and ensures that the end plate 2 has a good buffering effect; at the same time, it can avoid the problem of low energy density of the battery 1 package as a whole due to the excessive thickness of the end plate 2.

[0065] refer to Figure 2 The end plate 2 is provided with a plurality of weight-reducing grooves 22 on the side facing away from the battery 1, which reduces the weight of the end plate 2 and can improve the energy density of the battery pack; the end plate 2 structure left between adjacent weight-reducing grooves 22 forms reinforcing ribs 23 to ensure that the end plate 2 has sufficient structural strength to provide sufficient support and better protection for the battery 1.

[0066] A number of lifting holes 24 are also provided in the weight-reducing groove 22 to facilitate the movement of the end plate 2 during assembly or transportation of the end plate 2. Of course, in order to ensure the stability of the lifting end plate 2, a plurality of lifting holes 24 can be provided, which can improve the stability of the lifting process, distribute the gravity of the end plate 2, reduce the problem of concentrated force, and reduce the risk of deformation and damage of the end plate 2.

[0067] In the battery pack of the embodiment of the present application, the end plates 2 are arranged at both ends of the battery 1, and the end plates 2 and the battery 1 are fixed by using cable ties 5 to form an integral battery pack; in other embodiments, a box body may be further provided, and the end plates 2 and the battery 1 are both arranged inside the box body to form an integral battery pack.

[0068] It should also be noted that in the embodiment of the present application, the end plate 2 and the structure formed integrally with the end plate 2 are made of the same material. Exemplarily, the material of the end plate 2 is at least two composite materials selected from polycarbonate plastic, polybutylene terephthalate plastic, epoxy resin, metallized polypropylene, glass fiber, carbon fiber and ABS plastic; it should be noted that the composite material formed by different materials does not involve changes to the material itself, and all materials are existing in the art and can be directly obtained.

[0069] In the description of the present application, it should be noted that the terms "upper", "lower", "inside", "outside", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships in the working state of the present application. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0070] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense; in addition, the term "a plurality" in this application refers to two or more. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0071] The present application has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, various replacements and improvements can be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. A battery pack, characterized in that: include, A plurality of batteries, wherein the plurality of batteries are arranged in a stacked manner; An end plate, located at the end of the stacked batteries, with a plurality of connecting plates integrally formed on the end plate, and the plurality of connecting plates surrounding each other to form a connecting groove; A connecting hole is provided on the end plate, and the connecting hole is located in the connecting groove and is used to connect the output pole of the battery pack; A communication opening is provided on a side of the connection groove facing away from the battery.

2. The battery pack according to claim 1, characterized in that: A baffle is fixedly connected to the end plate, and the baffle is located at the communication opening.

3. The battery pack according to claim 2, characterized in that: An avoidance gap is arranged between the baffle plate and the connecting plate.

4. The battery pack according to claim 2 or 3, characterized in that: Multiple single cells are arranged into multiple columns, and two adjacent columns form a group; The connection slots correspond to each column of the batteries one by one, and the connection slots corresponding to the batteries in two columns of the same group form a group; The communicating openings of the two connecting grooves in the same group are connected, and the two connecting grooves share a baffle.

5. The battery pack according to claim 1, characterized in that: The plurality of connecting plates at least include a first connecting plate and a second connecting plate, and the first connecting plate and the second connecting plate are located on two sides of the connecting groove that are away from each other; The first connecting plate and the second connecting plate are both provided with limiting grooves on their surfaces facing the connecting groove for the output poles of the battery pack to be inserted into.

6. The battery pack according to claim 5, characterized in that: A plurality of the limiting grooves in the same connecting groove that are at the same distance from the end plate form a group; At least two groups of the limiting grooves are arranged in the same connecting groove, and the plurality of groups of the limiting grooves are arranged at intervals in the direction approaching and away from the end plate.

7. The battery pack according to claim 1, characterized in that: It also includes a cable tie, and the end plate and the battery are fastened together by the cable tie.

8. The battery pack according to claim 7, characterized in that: The end plate is provided with a limit block for limiting the position of the cable tie; The limiting block is located on a side of the cable tie facing outside the end plate.

9. The battery pack according to claim 1, characterized in that: The dimension of the end plate in the first direction is w, and the dimension of the plurality of batteries in the first direction in a stacked state is W; w and W satisfy: W≤w≤1.1W; The first direction is parallel to the large surface of the battery and perpendicular to the stacking direction of the battery.

10. The battery pack according to claim 1, characterized in that: The dimension of the end plate in the second direction is t, and the dimension of the plurality of batteries in the second direction in a stacked state is L; t and L satisfy: 0.05L≤t≤0.1L; The second direction is the direction in which the batteries are stacked.

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